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prop bolt length

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sarg314(at)comcast.net
Guest

Posted: Sat Dec 22, 2007 10:51 am Post subject: prop bolt length

I have a Catto 3 blade prop with the recommended Saber prop extension 

(same one van's sells). It is delivered with 6" bolts.  I need a 1/4" 

spacer to get the distance between the 2 spinner bulkheads to match the 

spinner and of course there's the 3/8" crush plate, the washers and the 

4 5/16" thick prop hub.



When I add up the thickness of *everything* in the stack-up and add to 

that the 0.435" by which the threaded portion of the prop extension is 

recessed into the prop extension, I compute that only the last 1/2" of 

threads on the 6" prop bolts are going to engage the threads in the prop 

extension.  Seems kind of skinny to me.



On the other hand, I think this is a typical installation.  Is this 

normal?  Is it adequate?

--

Tom Sargent, RV-6A

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