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HelicopterGasser Model RC HelicoptersOther › Predator clutch bolts sheered!!!
08-10-2007 05:47 PM  10 years agoPost 1
Gas and Go

rrApprentice

Western Wisconsin-​USA

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Just wanted to put this out there, add to you pre-flight list. It happend on a century predator gasser 26 cc.

Was out flying and after ten miunets of flying heard a crunching noise, came back in landed quickly. After a through inspection found that two of the four bolts were sheered off, one was missing; and thankfully one stayed in.

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08-10-2007 09:51 PM  10 years agoPost 2
Fixit

rrElite Veteran

UK

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That shouldn’t happen maybe something was out of line

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08-10-2007 11:01 PM  10 years agoPost 3
Gas and Go

rrApprentice

Western Wisconsin-​USA

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When I had built it up, I indicated everyting to run true.

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08-11-2007 12:46 AM  10 years agoPost 4
Gas and Go

rrApprentice

Western Wisconsin-​USA

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found cause of failure, the fan hub I have dose not have any flat spots for the button heads to seat (mine was round, causing line contact on the heads of the screws. I see that on heli worlds site the new ones have flats.

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08-11-2007 01:26 AM  10 years agoPost 5
AceBird

rrElite Veteran

Utica, NY USA

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It is common with the older version clutch. Century has increased the bolt size to fix the problem. I think you will find the other bolt is sheared too but jammed so you didn't loose the total drive of the motor.

I redesigned my clutch and don't even use bolts anymore. I cylindrical loc the steel drive key to the aluminum hub. If it should ever break free I won't loose total drive all at once because cylindrical loc doesn't totally let go.

Ace
What could be more fun?

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HelicopterGasser Model RC HelicoptersOther › Predator clutch bolts sheered!!!
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