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Archive January | RC-Warbirds Blog
Jan 31 2011

Video: Graupner HotSpot Turbine Jet

A short video of a Graupner HotSpot with JetCat P80 Turbine.
Nice landing approach

Jan 28 2011

February 2011 – Desktop Wallpaper

I hope you guys liked our January 2011 wallpaper.
We are kicking off February with a picture of 2 Warbirds shortly before take-off at the 2010 Warbird and Jet meeting at the MFC Dachau in the south of Germany.

Have a great February and don’t forget to send us your pictures if you feel they should be featured as one of our wallpapers


Depending on your browser, click the below link and save the picture or right click the link and select “save as..” to save the picture to your desktop.

iPhone & Android  |  1024×768  |  1280×960  |  1680×1050  |  1920×1080  |  1920×1200

Jan 22 2011

Build Log: TamJets F-16 with JetCat P-20 (part6)

Done !! (well except for the pipe which has not arrived yet).


Once the jet pipe has arrived from Gumania the engine can be started and the plane will be ready for maiden.



In summary: a very nice plane to build – quick and easy.
(a pre-installed rudder -which was also available from Tamjets- will make the installation even quicker).


Jan 18 2011

Build Log: TamJets F-16 with JetCat P-20 (part5)

Nearly done

To mount the Dubro 600ml (20oz) tank as close to the CG as possible, I have installed a wooden frame over the retract bay.
The top surface of the wood is coated with a thin layer of silicone. Once dry the “anti slip” effect of the silicone allows me to install the tank with 2 velco straps. This makes removal easy.


The turbine bay and servos are protected by a layer of TamJets Heat Shield Blanket and fire retardant foam tape.
The TamJets Hopper Tank is installed beside the main fuel tank near the steering servo.


The retracts are operated by one of our AirPower EV-2 electronic retract valves. The brakes are driven by a AirPower EV-1 brake valve.
As the gear doors stay open once the gear is out, I decided to use a single action EV-1 valve for the doors as well.
The door open airline is connected to the retract down airline. This will open the doors as the same time the gear is deployed.
The door close airline is then connected to the EV-1 valve which is driven by a separate delay mixed channel on my JR Transmitter.
Once the gear is retracted, the door close valve is activated automatically after a 2 second delay (servo speed setting) and closes the doors.


The Turbine pump and ECU, fuel valve and kero start valve are all located in front of the cockpit area to make it easier to set the correct CG later (I calculated with a pipe weight of 80grams).


The last item still missing (it slowly travels to Singapore by German Post) is the Grumania P-20 Pipe for the F-16.
Double wall, titanium pipe with only 76grams.. very sexy..

Mini Titan

The pipes are custom made and available from Grumania and of course via our webshop

Jan 16 2011

BAE Hawk–2010 Demo Colors (Wren44)

JTM-Hawk---Wren44-8This Jet Teng Bae Hawk in the colors of the 2010 Demo Team was converted from the original EDF propulsion setup to a turbine powered RC Jet by Heng.

The Model is powered by a Wren 44 Turbine Engine and carries 1 liter of kerosene.
With this setup flight  times of 6 minutes can be easily realized.

The model has a dry weight (hopper tank filled) of 4kg and hence a similar landing weight then the EDF powered version on 8S 4500mAh cells.

Another alternative for a turbine conversion would be the new Jet Cat P-20 turbine with 24N of thrust.
Although less power then the Wren 44 shown here, the model would be considerably lighter during landing (assumption would be 3.9kg take-off weight – 600ml tank – and 3.3kg landing weight).



Enjoy the video of the Wren 44 powered JTM Hawk in action:




Jan 11 2011

Build Log: TamJets F-16 with JetCat P-20 (part4)

Welcome to Part 4 of the building log. I’m close to finishing the F-16 now.
I manufactured 2 rails from plywood and glued it to the main fuselage former and fuselage sides.

The rails are a bit to low for the proper thrust line so 6mm plywood doublers are added at the mounting location.


A plywood triangle at the rear further supports the rail on the fuselage walls.



The JetCat P-20 fixed in place (with DIY mini FOD) ..


Jan 6 2011

Build Log: TamJets F-16 with JetCat P-20 (part3)

Next step:

Taileron servos and tailerons installed.
This step is very well prepared from the factory. Just slide them in and attach the horns. Done !!!

TamJets F-16 with JetCat P-20

TamJets F-16 with JetCat P-20

Cockpit “glass” cut out and glued into place with Pacer canopy glue.

TamJets F-16 with JetCat P-20

After it dried for 24 hours, the Pilot moved in.

TamJets F-16 with JetCat P-20

As his previous home was a HET F-18, I had to rebuild the cockpit floor from glassed balsa sheet.

Jan 2 2011

Build Log: TamJets F-16 with JetCat P-20 (part2)

Happy 2011 everyone !!

I finished the installation of the retracts and routed the airlines.
The intake duct is installed – I will have to cut it down later to install the fuel tank.


The EDF Version I’m converting does not have a rudder, so I decided to modify the plane and cut/install a working rudder for those cross wind moments.



The pictures below show how I cut out the rudder, added balsa to close the rudder and fin.


At the end I added a layer of light glass to the rounded edge so it an be painted. Looks quite good after the paint job.



The Rudder Servo is a Hitec HS-85MG which is installed in the small box below the rudder. A pin from the rudder will go into the small groove in the servo arm to drive the rudder.




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