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The tail control was not good with the original plastic blades supplied by Vario. This is due to the high takeoff weight of the turbine driven heli. Vario supplied carbon blades. I used them but one came of after 50 minutes. I used the plastic blades again but now with a 0,3mm thick carbon sheet clued on to them. They give me the same power as the carbon blades from Vario and they last longer.
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This conversion will take 5kg from the total weight of 14,2 kg!! The heli is fitted with a Hacker A60L 168rpm/volt motor, The battery is a build-up from 14 x 4800mah Kokam lipos in serie. Takeoff weight is 8,9kg, flying time is around 12 minutes.
Second conversion is taking place in April 2009. The extra power needed for the fenestron is not a real problem for the Hacker A60 motor but the cooling for this motor is not sufficient at these loads. Option one was a housing surrounding the motor with a electric fan. Option two was another motor that has more power so it needs less cooling. The second option was the choice so an Plettenberg Terminator 30-8 is installed The 14 cell battery is changed for a 10 cell battery like I use in the Bell230. Also the four blade head is put back on the heli
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The body is from Vario the mechanic is my own design. I wanted to eliminate any noise from conventional gears so I used belt drive where I could. The first stage is 1,17: 1 the second stage is 4,66:1 together give that 5,45:1. The rotor speed is around 1150rpm. I used a Hacker A60L motor 192 rpm/volt, max power is 2,6 kw. The controller is a Power jazz from Kontronic, and the battery is from Kokam, 10s-2p 4800 =9600mA/h. Rotor head is the standard Vario with the S-slag blades. The total flying time on one charge is more than 20 minutes!!!! (That’s better than the electric from Vario)
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The turbine that came out of the EC135 has to have a "home" to. I find the EC to small to carry the "heavy" turbine. The EC has only 168cm disk. A bigger helicopter is needed to make the turbine a success. I flown a Bell 205 with a 230cm disk and with a take of weight of 19 kg. That worked fine so I had to copy this formula. The AS350 ecureuil from Hugo Markes (www.modellsport.ch) is the helicoper for the turbine. It's very light (around 15 kg) for a heli with a 2,2meter disc. The PHT3 turbine wont fit and has to be converted to the PHT3.3. The turbine wil need other gears to get the headspeed around 900 rpm.
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So you want a scale helicopter and don’t know how to build one? that’s a bummer! Shall I make one for you? That was the start of this project, a Bell 430 for the only lady at our club that is in to helicopters.
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The ‘’normal’’ Rap has to bee fitted with a 90-size engine. I also have a NT and I really like the sound of this heli. The sound is really low and the engine makes less rpm than is normal. This is because the gear from the NT is 7,7/1 using the FX 91 HGL and 71cm main blades. I am building the Rap to a gear 7,5/1 (91 main 12 pion) using the same engine and 68cm main blades. The OS FX91HGL is an engine that delivers 2,84hp at 13000rpm the most torque is delivered around 11000rpm. So this engine is very strong at low rpm. The exhaust is made from a manifold from the Vario X-perience and a Hatori 700 pipe.
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