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HomeAircraftHelicopterThunder TigerOther › Belt tightness
01-18-2003 04:25 AM  15 years agoPost 1
rwquiring

rrNovice

Bend, Oregon

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How much deflection in the drive belt should I have on My Raptor V1?

Thank you

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01-18-2003 04:40 AM  15 years agoPost 2
metalman

rrApprentice

ada, okla.

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Belt tension
You should have between one eighth and three sixteenths inch deflection. Push moderately behind the large pulley. Alternately, you should be able to "roll" the belt with your thumb and forefinger 90 degrees with gentle pressure in the same location. Be sure and set the tension when at the field after the heli sits out for a while. The tailboom expands and contracts quite a bit with temperture changes. This can be important in cold weather.
You should not hear any "dings", which is the belt slapping the inside of the boom on spool up or shut down. A "ding" ever and then is OK.
Jim

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01-18-2003 09:51 PM  15 years agoPost 3
CraigH

rrNovice

Maidenhead, Berkshire, UK

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Hi

Another sign that the belt tension is too slack is that you can see the tail
jump under high loads. It might look like a gyro problem to you but the
belt can jump a tooth and so the tail violently kicks.

Better to have a slightly tighter belt than looser

Cheers

Craig

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01-20-2003 03:28 PM  15 years agoPost 4
alfred

rrVeteran

Australia, New South Wales, Mid North Coast

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But don't make it too tight or otherwise your autorotation clutch will drag.

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01-20-2003 08:48 PM  15 years agoPost 5
KC

rrElite Veteran

WA

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----

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01-21-2003 03:42 AM  15 years agoPost 6
2down

rrVeteran

Delaware

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I agree check your tention at the field. I never heard a "ding" but about half way through my flight sunday (25 Deg.) the tail jumped about 80 Deg to the left. I thought it was just cold fingers but when I landed there was alot of dust on the left side frame.
The belt had jumped under the guide pully and cut the pully to shreads. The belt held up verry well considering what it must have gone through, another 5 min. of flight under the pully.
Lucky to get it down in one piece and learn a leason.

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