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heli floats vibrating!

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scott finnie18/11/2016 20:52:44
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755 forum posts
95 photos
Had my first ever try at float flying today and although it improved balance considerably the floats really shook up in the air! There homebuilt from a childs foam swim noodle. Have braced them all i can though experiencing violent vibes that then travel through the heli. Any advice? Not planning on keeping them attached. Only want to experience landing and taking off from water.
Regards
Scott
gliggsy19/11/2016 00:41:58
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97 forum posts
4 photos

Bent shaft or unbalanced blades???

scott finnie19/11/2016 01:23:30
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755 forum posts
95 photos
Shaft is true and blades are balanced. Flies perfectly without the floats. The floats begin to shake when there attached. Possibly downwash?
Richard Wills 219/11/2016 02:28:51
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170 forum posts
7 photos

Could be downwash setting up some resonance. Could also be a slight imbalance somewhere setting it off which doesn't show without the floats. Have you tried changing the headspeed to see if the vibration level changes? Are they low frequency 'shakes' or high frequency 'blur' vibes?

Denis Watkins19/11/2016 07:03:51
3741 forum posts
179 photos

The guys are in the right area Scott. The slightest imbalance will be magnified and rotational way down at the floats. Assuming 100% balance and alignment of shaft, then resonance similarly rocks the floats aggressively due to their shape. Aerodynamics of floats? Downwash? Cylinders must be the obvious choice, we need the boffs Scott.

Peter Christy19/11/2016 09:07:44
1487 forum posts

It does sound like a resonance issue. Some pictures of your set up would help with a diagnosis!

--

Pete

RichardV21/11/2016 11:23:42
3 forum posts

+1 on the pics. Probably nothing wrong with heli, just a resonance issue. Attaching them more securely or making them shorter could help.

Rich

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