Fully Aerobatic Electrical Helicopters using 6s-12s Lipo packs for the mainrotor and 3s-4s Lipo-Packs for the tailrotor Main rotor diameter: 1560 mm Tail rotor diameter: 290-320 mm Weight: 3,2 kg plus batteries Flight time: 5-10 min, dependend from battery size, flight style, rotorspeed and weight Energy consume: smoothest flight+best conditions: 0,2Ah/min // Extreme 3D: upto 0,8Ah/min Concept After more than one year of development and testing minicopter is introducing with the Joker 3 DD ("DualDrive") a radical new design in 90 size 3D helicopters. Based on the security limitation that not more than 12 cells should be connected in series to avoid voltages higher than 50 Volts the basic idea to get more power output is to separate mainrotor from tailrotor mechanically to drive higher pitch angles and deflections. The concept is a completely separation of mainrotor and tailrotor and drive each rotor with a fully independent electric drive system, that means motor, controller and battery are absolutely stand alone for each rotor. So there is no mechanical power lost from the taildrive gear system. In practise the power for the mainrotor will increased for more than 20 percent and in combination with the flybarless head there are about 35 percent more power output than a comparable Joker 2 with MFS rotorhead.

Fully Aerobatic Electrical Helicopters
using 12s Lipo packs for the mainrotor and 4s Lipo-Packs for the tailrotor
Main rotor diameter: 1560 mm
Tail rotor diameter: 290-320 mm
Weight: 3,2 kg plus batteries
Flight time: 5-10 min, dependend from battery size, flight style, rotorspeed and weight

Further advantages of this ultimate future design:
-Much wider use of batteries now. Flying the Joker with a 50 size battery pack on the mainrotor. The Joker can be driven now beginning from a 6s battery for normal flights and upto 12 batteries for ultimative 3D power or ultimate lifting capacity.
- Free choose of turning and startinairy tailrotor DURING FLIGHT with switching different flight phases. When the mainrotor battery becomes empty or for aerobatic figures it is from advantage to have control about the tailrotor in autorotation. But in the case of a mechanical failure in the tailrotor drive or linkage it is better when the tailrotor can be stopped. So there is much more probability to keep control on the helicopter in emergency situations. That means if the altitude is high enough the chance to rescue the model is much higher now. This can save a lot of crash costs.
- The tailrotor can be adjusted now in its speed individually in a wide range independent from the mainrotor speed. So physically based vibrations or resonance frequences can be simply avoided what is especially for advantage for AP helicopters that need an extra smooth tail. Additional the tailspeed can be reduced as much as it is just necessary for each flight situation. This reduces noise and vibrations and saves energy.
- In fuselages it is much easier now to insert a tailrotor drive. The angle can be modified independent from any mechanical connection, so tails with positive or negative angle can be realized much easier with a Dualdrive taildrive. In extreme cases the taildrive with motor can completely be separated from the mechanic frame and fixed in the fuselage.
- The system is very easy to adjust and to handle, especially for novices. You simply drive both controllers in heli mode and can forget now each further justation.
- The tailrotor can be started first or both rotors can be started at the same time, dependend from the individual taste and the flight situation.