Thread: 7/16 or 3/8?
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Old 09-16-2019, 02:27 AM
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smokyray smokyray is offline
Join Date: Jan 2005
Location: TX32
Posts: 1,877
Default The answer is....

Originally Posted by RV10Man View Post
I bought a prop from a VAF member for my RV9A. It's the exact prop form Van's for my engine and airplane. BUT, I didn't fully check out my prop flange. My flange is for 3/8" bolts, the prop is 7/16".

My question to the gurus is, can I use this prop and install bushings/spacers, and use 3/8" bolts?
The answer is yes.
Keep the prop like it is and make the spacer match by drilling it out and using 7/16 bolts from Saber or whomever you choose. Bushings on a wood prop won’t work over time and the 7/16 bolts are far superior with an 0-320.
The older 4” spacers like mine on my RV4 had pressed bushings similar to Lycoming flange bushings that were difficult to remove so I drilled mine (and my prop) to 7/16. Reason for me is that 3/8 bolts didn’t hold torque more than 10hrs with my Sterba wood prop in the moist climes of my home state (FL).
You could drill the spacer yourself or send it to Saber mfg and have Sam drill it for you or just buy a new spacer from Saber.


Last edited by smokyray : 09-16-2019 at 02:30 AM.
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