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HelicopterHIROBOHirobo Freya › High pitched whine
10-08-2017 08:31 PM  8 days agoPost 1
PaulBowen

rrVeteran

East coast Australia.

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Hello

I have just replaced my OS105 engine bearings and realigned the clutch assembly only to find The helicopter still has the high pitched whine from beforehand.

Is it possible that it comes from the small clutch bell bearing as it is now happening at high idle.

If so would someone have the exact bearing type so that I know what to order?

Futaba T18SZ, JR Propo XG14, Hirobo fanatic!

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10-08-2017 11:04 PM  8 days agoPost 2
TMoore

rrMaster

Cookeville, TN

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When does the high pitched whine occur?

Delayed Response Operator Not Engaged

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10-08-2017 11:19 PM  8 days agoPost 3
JuanRodriguez

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The Villages, Florida

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TMoore
When does the high pitched whine occur?
Usually when the cheese gets taken away .....

Been there, done that and old enough to know better.....

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10-08-2017 11:21 PM  8 days agoPost 4
PaulBowen

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East coast Australia.

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It is audible at idle increasing to annoyingly loud in the hover.

Futaba T18SZ, JR Propo XG14, Hirobo fanatic!

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10-09-2017 04:36 AM  8 days agoPost 5
TMoore

rrMaster

Cookeville, TN

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When the clutch engages the bell housing the small bearings in the clutch assy are typically out of the picture. I would look at the entire bearing stack as well.

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10-09-2017 07:25 AM  8 days agoPost 6
PaulBowen

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East coast Australia.

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Good point about the bell bearing. One could assume from this that it is probably the top bearing which rotates at both idle and during flight.

Futaba T18SZ, JR Propo XG14, Hirobo fanatic!

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