Posts Tagged ‘ULSRS’
ULSRS Low Rotor Speed RC Heli Teetering Head and crash
This is a video showing some attempted hover tests of a fully teetering flybarless rotor system. The flybarless stability system was shut off so there wouldn’t be any problems from the stabilizer getting in the way of the basic flight feel of the rotor system.
Didn’t work well at all! Every time I attempted to lift the heli into the air, it would suddenly lean in a random direction.
Thinking that the problem was being caused by the skids not being able to freely slide on the grass, I placed a smooth sheet of plywood on the ground with which the skids wouldn’t have much friction. Didn’t help one bit and the inevitable happened – a crash.
During the slow-motion portion of the clip, watch the main frames and try to count the number of times they performed complete rotations.It’s pretty horrifying.
The closeup shots of the tail boom show something important that went missing; the tail servo. The force of the spinning/flipping heli threw the poor servo over 100ft away from the point of ground contact. Note the remains of the servo arm still connected to the forward end of the tail pushrod!
This is the same heli and head seen in the long video shot recently at the Hodges Hobbies All Electric Fly-In 2010. Extra stiffening was added back to the head to remove the freedom to teeter as seen in this video.
Video Rating: / 5
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