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Blade mCPX › brushless mCPX shudder
11-28-2011 07:01 PM  5 years agoPost 1
cudaboy_71

rrElite Veteran

sacramento, ca, u.s.

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i'm at my wit's end on this one.

as you'll see on the videeo, about 60% of the time the heli flies fine. but, seemingly at random it develops a terrible shudder.

new, solid (home made) main shaft, new blades, new feathering shaft, went through all the servos and they're very smooth on the bench and under load (spooled up in my hand).

power to board is directly off the lipo rather than through the brushless esc (caused pulsing motor issue).

went through every screw on the heli and all is tight. anyone have any ideas why it would just start shuddering, then clear itself back up on its own?

pay particular attention at 1:18 for a closeup example of the shudder. they are throughout the whole video...1:04, 1:08, 1:14 are the best closeups. the video didn't come out as well as i'd hoped. in person it is very easy to see throughout the whole flight.

Watch at YouTube

thanks

if it ain't broke, break it.

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR
11-29-2011 02:01 AM  5 years agoPost 2
cudaboy_71

rrElite Veteran

sacramento, ca, u.s.

My Posts: All  Forum  Topic

problem solved. found a thread on HF that talked about slop in the links. links didn't feel sloppy to me. but, they are so small, i figured WTH and gave it a try. putting a sliver of 1/2A fuel tube behind each link cleaned up the issue 100%

my helmet cam is not up to the task of showing this little heli. so, i enlisted the help of my 6-yr old. so, take it easy on the camera man...it was his first time behind the camera trying to follow me. neighbor's beagle doesn't care much for my flight, either.

Watch at YouTube

if it ain't broke, break it.

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR
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Blade mCPX › brushless mCPX shudder
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