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HelicopterMain Discussion › engine vibration
05-03-2004 05:24 AM  13 years agoPost 1
donswords

rrApprentice

Huntington Beach, Ca

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Just how much should a 2-stroke engine vibrate, aside from any out of round condition of attached fans, etc?

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05-03-2004 04:36 PM  13 years agoPost 2
crash1953

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Washington State

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Depends on if it is a big or small single cylinder engine .. They can really rock ond roll .. bigger they are, the lower the frequency, and the more you would notice it ..Thats why we use locktite to keep the screws where they belong..Also are you running it on a bench or on the heli?You will notice it more if you are running on the bench and dont have it clamped really tight.

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05-03-2004 05:29 PM  13 years agoPost 3
Mitchilito

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Morehead City, NC USA

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Crash is right - the bigger they are the harder they shake. My Rappy was smooth as glass with 60-70 engines. I put a YS 91 in it and it shakes a bit.
But you have to remember, a single cylinder engine can NEVER be balanced (without a driven balance shaft) because the crank flyweight will always cause a side-to-side imbalance.

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05-03-2004 05:30 PM  13 years agoPost 4
Doug

rrElite Veteran

Port Saint Luice Florida....

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< 2 IPS which @ 16,000 RPM (266.66 HZ) is equal to 2.39 Mills P-P

First member of Member of Bearings Anonymous

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HelicopterMain Discussion › engine vibration
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