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Certification Gotha P60 with JR Radio Systems!

28.July.2016

The Gotha P60 was rewarded with the second place at the international jetmeeting at Jets over Pampa for most impressive model! Again a nice prize for my JR propo controlled flying wing

RC Gotha Go P.60A - ProWing Nord 2016

Certification Gotha P60

29.June.2015

I am proud to announce that after some two years of preparation, construction and finishing of the Gotha P60 Flying Wing, the model got its certificate of airworthiness on friday 26th of june!

The static tests up to -8G and +4G, were performed thursday evening without any problem, so recieving a full aerobatic allowance.
The two certification flights were made the next morning and the Gotha showed itself as a stable, but heavy flying wing.
The take-off run is longer than we expected, some 150meters on a concrete airstrip. Landings were smooth, due to the assistance of the two large split-flaps on the underside of the model.
Banking and turning steep takes some place and time, just like many full-scale aircraft.
The pictures below are a reflection of the two nerve breaking but successful days.

Weighing all parts of the plane for the static test.

This has to go on for the -8G load, 128 kg in total.
Spread over the wing as an electronic program tells the examiner where to put them

The final 2,5 kg sandbags are on! (in the back, the trailer to transport this model)

Waiting for a few minutes to see if all stays ok.

Flipping the model over on its wheels to do the positive test

"Only" 64 kg on top of the wing to simulate the +4G load

The Gotha passed the static tests without any problem, we deserved a nice cool drink!
On the left Aad van Sorgen, the mechanical engineer, in the middle Mr. Reinhard Schott, the German air-official and on the right side, myself, the proud owner of the Gotha

The second day, the maiden and test flights were carried out on the nice airfield in Auerbach/Vogtland Germany.

All four elevators up !!

Airborne for the first time.

Nice low pass with wheels up! the four drag rudders on the wingtips extended

A stable, slow landing approach.

Safely back on the runway after a successful maiden flight.

Preparations for the second certification flight with both my sons, Ton & Mark and my friend Aad (with the checklist)

A proud Pilot with its nice wing and the great XG14E transmitter from JR propo



This flying wing project was a challenge to make this 70 year old design finally fly.
The help of JR Propo made it possible to use the safest RC system on the market today with its DMSS system and its diversity/redundancy capability
The good, European style XG14E transmitter gives me the comfort of resting my hands during control to steer more exact!
The powerful JR servo' s like the MP82T MK2, give a direct control to the 4 big elevons and flaps. Thanks JR!
Also the help of the famous Dutch micro turbine company, AMT Netherlands, made it possible to use my two reliable Mercury HP turbines without any problems.
The support of my wife, the help of my friends Aad and Giel and both my sons, helped me to bring this project to a good end.
Thanks to all the readers of the flying wing page on JR' s homepage.

With best regards,
Erik van den Hoogen

Nearly complete for maiden flight

11.May.2015

Construction has finished, also all covering is applied.
Paint job is the next step and also making Xbus work as needed.
The final update one will come after the maiden flight and the certification by the German officials.

Below is an update on the project "finishing plywood planking"

27.Feb.2015

The Gotha is in one piece again to check all wing angles in the original mould before planking the center part.
All RA01's antennas were replaced by the new RA02TL.
From the outer wing, the four elevons were cut out and shaped to fit the wing again.
On the building table lying, it was possible to weigh the model for the first time.
Total weight up to now is some 31kg.

On the table in one piece after a year, upper nacelle on its place, elevons cut out, ready for the top-planking.

All three new antennas from one of the receivers, notice the 90 degree angle between both antenna ends.
The other three antennas for the second receiver are placed at other places in the center part. Both locations helping for the best reception!

The Plexiglass "bullit proof" windshield for the pilots, 4 cm thick, weighing some 550grams.

My son Mark lifting the 20kg wing from the table, he still has a better back!!

The upper plywood planking for the center part ready for glue. This plywood will help in torsion strength of this relatively thin wing.
Over this Plywood of 0,8mm, a sheet of balsa will be fitted to make a nice surface for the top layer of silk and dope.
This plywood will be placed with a thick 24hr epoxy resin to fill all uneveness.

Weighing the 4 elevons, some 700 grams.

Below is an update on the project, finishing the turbine nacelles,

15.Jan.2015
First fit of both nacelles on the center part and the making the shape of the ¡¦ulletproof¡¦ plexiglas for the two pilots.
First fit of both turbine nacelles on the center part of the Gotha.
Rear view on the two nacelles
Shaping, sanding the foam inlet cones
The finished lower nacelle
The wooden mock-up for the plexiglass bullet proof shield for both pilots.
This is actually a part that contributes to the stiffness of the center part.
The plexiglass shield is weighing some 550 gram !

The center part upright with all parts like fuel, gas and airlines

01.Dec.2014
The center part upright with all parts like fuel, gas and airlines, all wiring inside, It is almost ready to cover with wood and some carbon for extra stiffness on torsion.
The Fuel "safety" system, two Festo shut-off valves driven by the small but powerful JR MP31Twv servo' s.
In combination with a mixer as slave from the 3-way switch for the turbine ECU, it gives the safety of a closed fuel line when the turbines are not running.
The test set-up to make the necessary adjustments in the mixer and Xbus menus, the two DS8911 acting like the turbine ECU' s. All done directly from the XG14E transmitter.
Both two liter tanks with the AMT fuel pumps on top, just behind the main spar.
The central pannel for all switches and connections with both turbines, text in Dutch, upper and lower, on and off, brake pressure and the light switch.
Place of both ECU' s between the upper and loper turbine mounting

Constructing the lower turbine nacelle and configuring the Xbus receiver unit.

11.Nov.2014
To make sure that all fits nicely in the frame, the AMT Mercury HP turbine is placed to fit.
The nacelle is build up, like the upper one, from small pieces of 3 mm balsa wood, every day a left and right one to make them dry together and avoid the build-up of tension.
The inner and outer duct can be seen clearly.
The lower nacelle almost closed,
A nice look through the inner duct from the front side of this lower nacelle after removal of the turbine.
Now working on the power and Xbus lines as will be used by the unique XB1-CHB and XB2-CHB combined with the two special RG031BX receivers.
The closed nacelle on the underside of the center part of the Gotha P60, landing gear extended.

Jetpower 2014 report,

27.Sep.2014
The Focke Wulf 3X1000 on the runway before take-off.
During the long weekend from 19 to 21-september, the 10th edition of the Jetpower meeting was held at the airfield of Bad Neuenahr-Ahrweiler in Germany.
This fair is famous for its flight show with only turbine driven models, planes and helicopters. Also the night flight show on saturday evening is a special event!
Some 130 pilots with their models were present to demonstrate the products that have a connection with the jet-scene.
Lots of military jets, private jet, and sport jets were flow before a very large crowd, more than 10thousand on the saturday. Also a range of turbine driven helicopters were shows in flight.
A new trend is the large glider, 5 meters or more, fitted with a turbine to start from the runway and make nice aerobatics.
At the fair, in two big tents, all jet related material could be found and purchased. From a turbine, a model or some optional parts, all was available.
At the JR booth, a lot of interest was given to the new X28 and the XG14 series.
For JR, three models were shown, a pair of Blanik gliders with smal turbines performing nice aerobatics, controlled by the 2,4Ghz DMSS system from JR propo.
One of the highlights was the big flying wing, the Focke Wulf 3X1000, making some nice wide flights showing its delta like shape.
This big model, rated in the 25+Kg class is also controlled by JR's DMSS system with the new Xbus redundancy system, consisting of two dedicated Xbus receivers and a special Xbus HD hub.
The JR booth at Jet power 2014 in Bad Neuenahr Germany
Lots of people in one of the big display tents
Preparations before flight
Gathering speed for take-off
Full speed 90 degree turn
Lining up with the runway for a smooth landing.
Giant Focke Wulf 3x1000 3,50m Wing Jet Power 2014
Giant RC Turbine Jet Focke Wulf 3 x 1000 B 3,50m , Flight Demonstration , JetPower Messe 2014 *HD*

50% of a hardest wooden work part has been completed!

05.Jun.2014
The upper turbine housing of the Gotha is almost ready, the difficult woodwork is done, a foam inlet cone has to be shaped from a block of blue foam The inside is covered with a frame protector, Heat-shield from BVM This upper nacelle is removable to make sure that the center-part of the Gotha can be transported from the building room, two stairs down, to the trailer.
So now the woodwork on the lower nacelle can start.
I presume that it will take the same amount of work(time) as the upper one!
Side-view of the nacelle, planked in 3mm balsa.
Inside of the nacelle completely covered with Heat-Shield to prevent a fire when, sometimes at start-up, the turbine produces a flame.
The tail side of the nacelle, the double trust pipe with the balsa wood covering.

ProWing 2014 in Bad Sassendorf Germany.

26.May.2014
During 3 days, 9 to 11th of May, this fair with air show was held for the 4th time.
Despite the marginal weather conditions, more than 10.000 people visited this event.
The Dutch flying wing team was invited to perform show flights between the slots were all the manufacturers displayed their products in flight.
On Friday it was possible to make two flights, demonstrating this big flying wing capabilities and its new RC set-up from JR with as a highlight, the new redundancy XBus hub with the twin receivers (XB2-CHB with RG031BX receivers) . This set-up is required for all 25+ kg models in Germany.
Despite the strong wind on Friday, both flights were carried out in a nice and safe way.
The flight on Saturday was one of the best ever with this model, nice take-off, smooth flight with some simple aerobatic manoeuvres and a soft landing. A nice, big applause was the reward.
One of the highlights was the huge B-25 Mitchel from Team Sabatschus, some 6 meters of wingspan and powered by two 400 cc Moki radials and weighing just below the upper limit, 146kg!!
In the big tent, some 100 exhibitors showed and sold their products, varying from a small bolt to a complete model, balsawood engines and RC systems as demonstrated in the JR Propo booth.
On the airfield, several units were placed for a good German beer , a soda or something to eat lake a nice German "Bratwurst" . For the children, a merry-go-round and a nice ice cream bar were available. The atmosphere was good during the 3 days, not one model got damaged even in the strong winds that lasted during the whole fair.
I hope to return to ProWing with the new Gotha to show another strange flying wing to the visitors of this nice meeting!
The Focke Wulf 3X1000 ready for its first flight.
Preparing for starting both turbines.
Pointing the nose in the wind!
In flight, landing gear still extended.
Coming in for the landing.
Taxing back after the first successful demonstration.
The JR booth in the big tent, just before opening hours.
Lots of interest was given to the new Forza 700 helicopter
And of course, the new 28X transmitter.
Nice woodwork to create a strong and light model.
The Kolm 100cc 4-stroke 2-cylinder line motor with reduction unit, Nice!
A new Krill model with JR RC equipment,
Also here the new redundant X-Bus hub was used in combination with the powerful DS6311 servos.
A big stand with nice big modern aerobatic planes.
An old, scale wooden glider designed and constructed by modern CAD-CAM techniques.
Proudly showing the good JR transmitters.
A big German engine stand with some nice models.
A nice pair of scale models build with steel tubing as seen on the Piper.
The big B25 with the two 400cc radials, waiting to get starting permission.
The 1/3 scale Japanese Aichi D3A dive-bomber from Gerd Reinsch.

Construction of the upper turbine nacelle.

02.Apr.2014
The turbine mounting and the double jet-pipe. The inner one is made (spot-welded) from 0,07mm stainless steel with an aluminum Venturi shaped inlet to get as much cold air possible mixed in.
The outer pipe is made (spot-welded) from 0,15mm aluminum sheet and is used for keeping the heat inside this system.
This is the complete upper exhaust pipe on the centre of the Gotha.
Test mounting of the upper AMT Mercury HP turbine to see how to have access to this engine.
The formers have been placed. The whole unit is removable for transport from the building room to the trailer by two flight of stairs!
The nacelle will be covered in 3mm balsa and will be heat treated with "Heat Shield" from BVM, a ceramic paste that can resist flames and high temperatures.
These are the first few pieces of balsa glued on, it will be build up like the hull of a boat.

The practical example of XBus system installation is shown!

20.Mar.2014
The two Heavy Duty Center Hubs coupled for the Gotha. the twin receiver (RG031BX XBus Receivers) system with the XB2-CHB center hub that is connected to the XB1-CHB center hub to provide up to 6 power-outlets and 8 Xbus outlets, together direct availability for 32 servos! This in combination with the PWM converters.
In the Gotha 16 servos are used so this will work great.
The twin receiver system, also called a redundancy system, has to be used in big models that have a weight of more that 25 kg by German (European) rules. So I have to use this system in the Gotha.
This is setup for the Focke Wulf 3x1000, the twin receiver Xbus Hd hub(XB2-CHB), two XB1-PC4 power converters and one XB1-CV4 converter. The RG031BX XBus receivers are used for redundancy.
With these 12 outputs, the FW can be controlled safely by the XG14E transmitter.
It's going to Fly at The ProWing International 2014. (9th - 11th May. 2014)
For the Focke Wulf 3x1000, the new XB2-CHB has been build in to comply with the rules, this gives me the (legal) go to fly at the upcoming air shows like ProWing.

The Xbus setup for the FW can be seen below:
Setup Xbus for the Focke Wulf 3X1000
PWM converter #1 (XB1-CV4)
ControlOutput #Gotha P60Remark
Throttle Left01-0101-01
Throttle Right01-0201-01
ECU Left01-0309-01
ECU Right01-0407-01
PWM Heavy Duty converter #1(XB1-PC4)
ControlOutput #Gotha P60Remark
Left Elevon01-0102-01
Right Elevon01-0202-02
Left Rudder01-0311-01
Left Rudder01-0308-01
PWM Heavy Duty converter #2(XB1-PC4)
ControlOutput #Gotha P60Remark
Brake01-0110-01
Flap01-0206-01
Gear01-0305-01
Rudder wheel01-0404-01
Heinz Jr. is already waiting for his next flight with the new JR materials in de Focke Wulf 3x1000! (( :

The ProWing International 2014 will be held at May 9th to 11th 2014.

17.Mar.2014
Erik van den Hoogen is introducing as one of the representative pilot.

Inner Equipments

11.Mar.2014
The connection board for all 5 LiFePO4 batteries, the two Deans for the JR Xbus HD Hub, the green for the two AMT turbine ECU's,black for the lightning system and the red one for the retractable landing gear The lose connectors are the balance plugs for each battery. This is the connection with the batteries, so also used for charging.
The LiFePO4 batteries are allowed by the safety rules as they are in place for >25kg models.
The grey brick on the right is the pneumatic brake valve.
Front view, center part of the wing is lying on its back. Al cabling for left and right wing panels are build in, both hopper-tanks are visible in the center, placed in an angle to make sure that this air-trap works fine.
On the right, the battery compartment can be seen with the air bottle for the wheel brakes on the side.
On the left side, the nose gear can be seen in retracted position. steering of this nose gear is done by one JR DS8911 servo.
in the open space in the middle, the cockpit will be placed. This is now under construction by my friend Giel Dols.
The drawings of the upper and the lower turbine nacelle with the center rib in between.
The trust angles for these turbines will be some plus (lower)and minus(upper) 7 degrees.
If You watch closely, You can see both AMT Mercury turbines drawn in!

The landing flaps, fully deployed, some 80 degrees of disturbance to slow the model down, controlled by two powerful JR DS8911 servos. Strong JR aluminum servo horns are used in combination with 3mm ball joints one XB1-PC4-D converter is used for this function. With help of the Xbus menu on my JR XG14E transmitter, it was easy to make both flaps work in the same way!

Setting up some mechanism inside the huge wing.

18.Feb.2014
The outer wing panels are closed and ready to sand in shape.All servos are build in, the extra units show the inside!
The powerful MPH83T MKII are used for the large inner elevons.
The XBus XB1-PC4 controls the 4 servos in one outer wing, two drag rudders and the inner and outer elevons.
All connectors are secured with a clamp for extra safety.
Work has restarted on the center part.
A charge/connector board is installed.
Here all connections between the 5 batteries and their users are made.
5 Batterie sets are build in. all of them LIFE for safety reasons.
The bottle is for the air used for the pneumatic disc brakes in the main wheels.
Also two servos with switches for the landing gear and the light system.
Landing gear is ready and put in, look at the angle and asymmetrical nose gear.
This handcrafted gear was build by my friend Aad van Sorgen.
He was a metallurgist teacher at the Eindhoven University before retirement.

Planking Process. Pay attention to the fine elaborated process.

7.Feb.2014
The upside-down mold, building this on top of the upper side of the Gotha, when ready, the wing will be flipped on the topside.
Detail of the upside-down mold at the tip.
Extra mold for the centre part
Flipped on its upper side!
The wing has been set very precisely on the mold for next procedure.

Restarting after the short rest.

21.Jan.2014
Top-planking outer wing panels installed!
Drag rudders installed and adjusted with help of the powerful XBus system.
In, no drag, half deployed, medium drag and finally, full deployed, max drag Extra drag means extra stability during slow flight.
Both big inner flaps, Controlled XBus Heavy Duty converter and steered by the powerful DS8911 servo.
Both servos are mounted in an angle so that when retracted, the servos have nearly no load!

Getting underway of planking procedure

22.November.2013
The Gotha P.60A is proceeding well.
The covering process is getting underway.
We hope you'll get the good example from its unique construction.


Some pictures of the first skinning.
The skinning of the double elevon section.
landing light units in the right outer wing panel, 6 watt LED.
Battery box, 2 x 2 LIFE 2500 cells for Heavy Duty Center Hub, 3 LIFE 2500 cells for twin AMT turbine ECU's and 4 LIFE 1200 cells for the electric landing gear.

The drag rudders

5.November.2013
4 MP31Twv servos are used to operate the 4 drag rudders in both wingtips, see the two positions, lying in the wing and upright to create some extra drag on the tips.

The receiver unit

The XBus HD center hub is positioned in the front of the center part, together with the receiver RG731BX, its telemetry unit and the altitude sensor TSL1-ALT.
The small PET bottle is used for the pneumatic brakes in the main wheels. it can be used up to 10 bar pressure.
In the wing is the PWM converter XB1-PC4 mounted to support the two drag rudders and the two elevon servos, only one signal and one power line to control 4 servos coming from the center hub!

Goods arrived and some nice pictures

28.October.2013

The center piece of the wing for the first time on its three wheels The nose gear is placed asymmetrical so that no dirt is send into the lower turbine as you will see in a later stage when the two turbine housings will be in their place. Notice that the main gear legs are standing 25 degrees to the front. This was done to place the wheels close to the center of gravity for easy rotating during take-off in combination with the fact that in the front of the wing, there is enoug space to house the wheels when retracted.

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XBus setup

11.October.2013

We started the XBus setup for Gotha P60.
All these 16 servos are precisely caring out their specific job.

Configuration:

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XBus equipments:
1 x Heavy Duty Center Hub XB1-CHB
5 x Heavy Duty Converter harness XB1-PC4
1 x XBus converter XB1-CV4
1 X DMSS RG731BX XBus receiver

Servo list:
1, Small left aileron MPH83S
2, Elevon left MPH83T
3, Drag rudders left MPH83S
4, Small right aileron MPH83S
5, Elevon right MPH83T
6, Drag rudders right MPH83S
7, Central flap left MPH83T
8, Central flap right MPH83T
9, Servo for gear switch 3 x MP31T on a custom door sequencer
10, Nose gear rudder MPH83T
11, Proportional brake valve Custom electronic valve
12, Throttle L AMT ECU
13, Throttle R AMT ECU
14, ECU 3-way switch turbine1 AMT ECU
15, ECU 3-way switch turbine2 AMT ECU
16, Landing light switch MPH83T

Channels assigned on the XG14E :
1, Throttle
2, Left elevons
3, Right elevons
4, Nose gear rudder
5, Gear
6, Left turbine 3-way switch
7, Right turbine 3-way switch
8, Wheel brakes
9, INH
10, Flaps
11, Drag rudders
12, INH
13, INH
14, Landing light switch

For the site

09.October.2013

The Wing is getting its shape, all ribs are set-up and spars and webbing are in place.
Front wing joiners are on their correct place and secured with aircraft grade epoxy and bolts.
the wing twist can be seen, a total of -7 degrees. This secures the stability in flight.

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Project restart

24.September.2013

Dear Reader,
After a difficult period with back problems, I made a restart with the Flying wing project.
My health allows me to go to the building room again for a short period every day!
I hope that You enjoy the progress and want to thank You for Your patience.

I put up the center part with the both strong sets of spars with their aluminum wing attachments and the mounting for the landing gear.
The nose-gear is visible asymmetric, this so the nose-wheel did not throw dirt in the lower turbine!
Both 2-litre tanks are placed on the center of gravity in the coated wooden space between the two main ribs.
next will be the lineup of the rear spars so that the both turbine mounts can be placed.
Also the pumps, hopper tanks and both ECU's will have their place in the room behind the tanks.

 

Kind regards, Erik van den Hoogen.

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The Euroflugtag 2013 in Rheidt Germany

3.Sep.2013
In the weekend of 10 and 11 August, Germany's largest model air show took place near the famous city of Cologne.
150 pilots with their 220 models were together at the big model airfield in Rheidt. The models varied from early WW1 biplanes to the latest in modern jets. The weather was good and at a lot of stands, food, drinks, ice cream and modeling materials were present.
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In the weekend of 10 and 11 August, Germany's largest model air show took place near the famous city of Cologne.
150 pilots with their 220 models were together at the big model airfield in Rheidt. The models varied from early WW1 biplanes to the latest in modern jets. The weather was good and at a lot of stands, food, drinks, ice cream and modeling materials were present.
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Flight displays were done by a program so that there was always action in the sky! The Saturday evening ended with a big firework display for the pilots and spectators.
One of the highlights were the 15 WW2 fighters of the group called "Legendary fighters" who all build their models in a 1/5 scale size. During this display, a big pyro show was done together with these models in the sky, spectacular!
Also a group called "Dawn patrol" , made a show with 12 WW1 biplanes, the view and sound are nice!
Several very large gliders were towed in the air, the biggest one had 9 meters wingspan! A lot of the best aerobatic pilots with their big models and huge engines performed their programs, often flown on music, looks and sounds great!
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For me this was the first show where I flew the Focke Wulf 3x1000 with JR's new XG14E. This is a great transmitter in the European tray style, a pleasure to use it, giving rest to the hands while controling the model.
Range and speed are very impressive, in total, I made 3 good and safe flights for some 10.000 spectators on Saturday with even a bit more on the following Sunday.
Good and long applause was given after I landed the model in a scale way.
I showed the new XG14E to several of my fellow pilots and almost all of them liked the new style.
I spoke the technical radio-transmissions supervisor of the German air authorities regarding the new DMSS system and he was impressed with the quality of the radio connection. Quite a compliment for JR!
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Dear reader

23.July.2013
Dear reader,
Due to a serious back injury, I will have to pospone work on the Gotha flying wing project.
The project had made good progress until now, working on preparing all parts that are needed to start the building.
As soon as possible, I will resume this great project.
Thanks for Your patience,
Kind regards, Erik van den Hoogen.
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Updating progress of making the "kit" for the Gotha P60

14.Jun.2013
Hi! Updating progress of making the "kit" for the Gotha P60.
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This is the rib that is going to take the main and nose gear
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This are all the ribs, the package is now complete, just have to make all the spar entries.
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The one with me is the center rib, 1,95meters long!

Updating some parts for the project

31.May.2013
Hi there! Updating some parts for the project.
I hope you like them !!
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Landing gear parts, oleo legs with wheels and brakes in the rims and the corresponding retract units.All of this is hand build! only the tires are purchased.
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Retract unit main gear, electric drive.
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Ribs for outer wing panels, ruler is 100cm
Balsa wood 3 and 4 mm
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Main spars and centerfront spar, laminated pine wood, some 6 to 12 layers,

Here at my building room

24.May.2013
Here at my building room, I have cleaned all and made a 500 Watt lightning bar above the construction table,
You can see in the picture (made with no flash!)
I made a extra piece of table to support the front of the model, see picture.
Before I can start the construction, I have to get my drawing back from the printshop, they copy my drawing of the left wing to become my right wing. So I am sure that the are the same size!
The work on glueing the multiple layer wing spars is on its way, the first 2 are drying now.
When I have finished on the spars, than I can put up the mold where the complex Bell shaped lift distribution gets its shape. I have cut this mold from strong plywood to secure the wing twist during construction.
All ribs are drawn on paper so that I can cut them from mostly Balsa, some strong ones to cary the landing gear will be cut from plywood.
It is always to make a kind of kit before I can start constructing.
A member of the team is working on a camera system that makes a picture every day so that the progress in building can be watched as a powerpoint presentation. The camera will be put in the top of my building room for the best view!
Don't miss the next update from the new building room!!

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Gotha P50 prototypes

24.May.2013
Attached is a picture of the two Gotha P60 prototypes. The second one (with the text) made its maiden flight yesterday. It is a little different in the way the bell shaped lift distribution is build so it has a slight different way of control. The rebuilding of the building room is almost finished so that I can start with the big project.
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The flying wing, an addictive way of aero-modeling

Some 23 years ago, I was present at one of the first Inter-ex meetings, looking for new ideas for my modeling. My attention was drawn to a special kind of plane, the Horten flying wing. A few of these wings were flown at that meeting, I was impressed!

First a bit of history:In the early 1930' s, two brothers in Germany, Reimar and Walter Horten, were working on their first full size flying wing, the Ho-1.
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After winning a prestigious prize at the Wasserkuppe, the hill were almost all German Luftwaffe pilots learned gliding after WW1, they started on a line of flying wings that resulted finally in the world' s first turbine powered flying wing, the Horten-IX-V2.
After WW2, the Horten brothers went to Argentina and kept on experimenting with their flying wings until 1969.


In RC-modeling, only a few brave pilots experimented with these flying wings because only very little was known about the techniques that made these wing fly stable without a fin and rudder.

With the introduction of computers it became possible to calculate the wings for these types of planes, the bell-shaped lift distribution as stated by professor Latska.With help from a real Horten model pilot, the first Horten model, the Ho-IX-V1, was drawn on a plan and build from balsawood, this was 1990!

This first model was also the start of a good friendship between Aad van Sorgen and me. He is the person who has made all the landing gear units that were used in all the models! Besides the gears, all the metal work is designed and constructed by him.
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In the following years a 4-metertwin engine Ho-VII was built in 1/4 scale

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Also a Ho-XII in 1/3 scale was build and successfully flown, wingspan 5,33meters!
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To make a different wing after these 3 Horten' s, the choice fell on a British wing from professor Hill, the Westland Pterodactyl MK4 from 1931, again in 1/3 scale, giving a model with 4,5meters wingspan and a flying weight of 21 kg. All these models were electric powered and carried some 60 NiCad cells for a flight time of some 3 to 4 minutes! A nice article from Mr G. Revelabout this last plane was published in the Japanese magazine Radio Control Technique 1998 issue 10

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In 2000 it was time to return to Horten and built their best type ever, the twin turbine Horten-IX-V2. In the previous years, I got to know Mr. Scheidhauer, the test pilot from Horten who tested all the planes that the Horten brothers ever build, including the Argentina period. He stated that if we would bring our big Horten-XII to the Wasserkuppe Museum that he would provide the money for two micro turbines to get started on this most difficult project.
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During this period, a famous writer for model magazines, Mr. Guy Revel, also introduced my models to JR Propo's Mr. Kuyama. With his help and great interest for our flying wings, JR Propo started with help to put the best RC equipment in this ambitious model. The result was a superb flying wing in 1/4 scale, 20kg weight and a wingspan of 4,2 meters. 159 flights at the mayor airshows in Europe, awarded with a lot of prizes was the result for all the work and support of a lot of people with support and material. Up to now, this is still the only flying scale model in this size that has the flying status with help of the bell shaped lift distribution, as the Horten brothers used in 1944.


The real Horten-IX-V2 was the winner of the 3 X 1000 project that was written out by the German Luftwaffe. The other competitors were the Heinkel P1079B, the Blohm & Voss P215 and the Focke Wulf 3x1000. So to make the same series, the first one to be build was the B&V P215, designed as a heavy fighter-bomber to fulfill the 3 x 1000requirements, speed: 1000km/h, range: 1000km and a bomb load of 1000kg. As a model it had an impressive look, a fat fuselage with two tail feathers on the end of the main wing. We learned why this type did not win the competition: it was a very difficult plane to flyso after 14 flights in 2005, we grounded the model to be sure that no accidents would occur at shows. Safety first!
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The second one was the Heinkel P1079, also a prototype for the 3 X 1000 series, again with the two turbines and this time with the brand new JR PCM12X transmitter with the DSM2 technology! After the construction and successful flying of a smaller test model, we started working on a 1/4 scale wing with a long cigar like fuselage. After two years of building, a successful maiden flight and certification by the German air authorities gave the start for the new show season in 2010. Certification was necessary due to the weight of the model, 34kg. 25kg is the limit in Europe for model airplanes, up to 150kg these models are called "light aircraft" and have to be certified.This model did not have a long life, due to an eye disease; the model struck a line of trees while on approach for landing during a test flight and was a complete loss. After visiting a specialist, the illness was solved and the eyesight is fully restored. Not seeing depth was the root cause for this accident.
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To get back in the air show scene, a new model had to be build and the choice was the remaining type from the 3 x 1000 challenge. It was the Focke Wulf 3x1000, a twin turbine delta shaped flying wing. After a successful flight of the test model early 2011, work started on the big one, 3,50meters wingspan and a flying weight of 29 kg. With the help of the powerful JR servo' s, DS8911 and DS6301, the big elevons, flap system and the vector trust flaps in combination with the good PCM12X , could be safely controlled far beyond the flying speed of 260km/h! Up to now some 40 flights are made during several mayor airshows in Germany, Belgium and the Netherlands.
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This model has been awarded with several trophies, in the categories "best technique" to "best jet" and "special performance".


Time for a new project; the new project has been chosen to keep in line with the Horten ideas. It will be a 1/4 scale Gotha P60A. In 1944 Gotha was contracted to build the Horten-IX-V3 as newest fighter/bomber for the Luftwaffe. The Horten brothers had no facilities to make a series of planes; they could just make one new type before starting on a new project. The Gotha engineers thought that they could do the job better than Horten so they planned a successor for the Horten, the Gotha P60A.

The goal is to see if this plane is really a better flying wing that the Horten-IX-V2 that I flew before.
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