Long bolt modification

Share your thoughts, photos and general help to all builders

Postby Wayne » Thu Jan 14, 2010 7:31 pm

Thankyou guys,
The standard configuration that I have seen with the Bi-props is just the washer/lock nut conbination, I don't think I have seen a crush plate added to the factory Bi-prop, but no doubt a crush plate would spead the load and reduce stress on the prop in that area.
However perhaps the original set up allows the extra moment/flex of the Bi-prop and the crush plate could cause extra stress on the prop by inhibiting the flexibility?
There is a problem with engineering and when you take the movement out of one area by stiffening/strengthening an area, the stress it is transfrered to another area so the answer is in many instances 'Flex' , thats one for the master Dale Kramer any comments ?

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Postby Shannon » Sun Jan 17, 2010 7:07 pm

Bi-prop failure.....no crush plate. What caused this ? No idea ? Maybe Lynn Haugo can say. I believe this failure happened to him.
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Postby Chappy » Mon Jan 18, 2010 2:27 am

Most probably one of the props made from DuPont Rynite.

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