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Here is
a quote from his book Tony Bingelis on Engines: "anyone who
installs a spinner without a proper fitting front bulkhead is begging for fate
to take a swat at him"
Here is
the ring of prepreg I used which fits around the crush plate, just
like Paul describes below.
We had two backing plates crack on an O-320, fixed pitch
prop, with the Lancair 12" spinner. The slight out-of-balance of these
spinners, with no forward bulkhead, would cause them to flex the backing plate
and crack it. Since putting in a fibreglass-reinforced 1/4" foam forward
bulkhead inside the spinner, which fits snuggly around the crush plate, there
has been no more cracking on that plane, nor on my O-235.
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