The other day, Vivian posted a request for help for a friend grounded with a busted Sensenich. Several others have made comments about prop failures on Sensenichs and I thought I pass on something that I learned from Lonny Prince when I replaced my Sensenich with one of his props. The instructions for mounting the P-tip said that the prop must be at least 6 inches from the engine exhaust ports in a pusher configuration or damage to the prop can occur. My exhausts are only about 3 1/2 inches from the prop disc and I was getting discoloration on the prop from this. I had the same thing going on with the Sensenich. The fix is the remove the prop and rotate it a bolt hole or two (or as needed) until the prop is only passing the exhaust ports when the engine is in compression. This I did, and no more exhaust discoloration. I suspect the failures that have been reported are most likely due to prop damage caused by improper mounting in relation to the high exhaust temperatures to which it is being subjected. Sensenich makes a fine product and they have been in the business since dirt was invented. I'm not inclined to think the prop is the problem.
Tim Hansen
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