Vario Bell 412 R/C Helicopter Electric Conversion

The fuselage is a Vario Bell 412 painted in PHI (Petroleum Helicopters Inc) colors. Mechanics are Vario Skyfox custom-converted from a nitro engine to electric power. Motor is a Kohler Actro 32-4, battery pack is 12S LiPo, 4900mAH. To let the four-blade main rotor handle easily in forward flight and wind, a Helicommand gyro ‘virtual flybar’ is connected on the cyclic. Flying weight is somewhere between 16-19lbs. The slow windup of the rotor system is due almost entirely to the smart idea of leaving the original centrifugal clutch in the new electric drive train. Combined with the programmed slow start of the Castle Creations 85HV brushless motor electronic speed control and you now have a very close simulation to a true gas turbine start – without the gas turbine price tag. The electric conversion is a product of Unique Aircraft, owned and operated by master scale heli builder, Darrell Sprayberry.
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