Bell 412 Scale R/C Helicopter E-Power Test Flight

Bell 412 Scale R/C Helicopter E-Power Test Flight Video Clips.

Some playing around with a newly converted nitro heli chassis in my front yard. After the purchase of this prefinished Scale House Helicopter Bell 412 body, I decided to use a brushless motor to power it instead of the nitro engine more commonly employed. The heli chassis of choice was the Miniature Aircraft X-Cell Graphite from 10+ years ago and an electric conversion was designed to keep the stock centrifugal clutch. The motor picked is the Great Planes 'Rimfire' 50-65-450 and is geared 10.64-1 to the main rotor. Power is 10S Li-Po (37V nominal) and flight time is a safe 8min to the 80% capacity point of the pack. The Rimfire motor is not intended for heli operation and in stock form doesn't have adequate cooling for the job. I manufactured an auxiliary fan that covers the bottom of the motor and cooling is working perfectly. The four-blade main rotor is stability augmented with a pair of CSM SL720 gyros and a Helitronix mixer to interface them in with the custom eCCPM swash control system. In this video there's still too much collective pitch for scale flying so the heli is rising and falling quite a bit. Sorry about that :-) I had some fully charged Li-Po battery packs to drain down to storage voltage and I couldn't think of a more fun way to do the discharge. The 'camera man' is a tripod in the yard. I just can't find a real person to aim a video camera when I need the help. This forces me to fly a rather restrictive path to help keep the heli in view of the camera.

Tags: Radio, Control, aviation, space, model, aircraft, helicopter

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