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Helicopter
e-
Align
Other › pre lift off vibration
04-01-2005 12:43 PM  13 years agoPost 1
Mindchatter

rrVeteran

Naugatuck,CT. USA

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I get LOTS of it just before lift off and during the spool down..... Think my main shaft is bent?

www.rceyeonline.com

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04-01-2005 01:01 PM  13 years agoPost 2
docnascar

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Maryland, USA

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Its normal to have vibration before lift off. The blades have to balance themselves out.

To check for a bent shaft:

Spin your shaft and look directly down at it. If the center of the head is wiggling back and forth then your shaft is bent.











....there goes that CA glue sticking to my fingers again!!!!

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04-01-2005 04:41 PM  13 years agoPost 3
dogon1013

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Orlando, FL

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yup, if your blades are loose they will vibrate until they spin up enough for the centripital force to allign them correctly. If it vibrates right up to before you lift off you may not have enough headspead to let them self align.

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04-01-2005 06:03 PM  13 years agoPost 4
TheDudeVT

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Burlington VT

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I've found also the opposite to be true, if your blade grips are too tight, it'll vibrate alot during spool up. Once it's flying it's fine. Assuming your mast is straight, try this:

Spool up the heli with the blade grips somewhat loose to center them. spin down and tighten the grips now that they're nice and straightened and centered.

Tightening the blade grips down helps avoid boom strikes.

TheDudeVT

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04-01-2005 06:55 PM  13 years agoPost 5
StrangeRanger

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VT

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Blade tightness: An old wise man (I think he was 16 when he taught me ) showed me the tip he, and a lot of others, uses for blade tightening. Screw them down snug, tip yer heli on its side and see if the blades flop down. If the blades stay put, but will move if you give the heli a little shake, you have them 'bout right. Then it all comes down to personal preference.
j

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04-01-2005 10:03 PM  13 years agoPost 6
Mikes machines

rrNovice

Seville, Ohio

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After a recent not so perfect landing mine started to wobble like this. I looked at the top of the heli and could not detect any out of roundness. I took the main shaft out and rolled it on a piece of glass. Sure enough it was bent very slightly. New shaft no wobble.

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04-02-2005 02:43 AM  13 years agoPost 7
Mindchatter

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Naugatuck,CT. USA

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hmmm, mike you might be right....looking down on it while spinning there is no evidance of the shaft being bent......but this did start after I kissed the ceiling.....at full throttle!

www.rceyeonline.com

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Helicopter
e-
Align
Other › pre lift off vibration
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