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Bertram31.com General Bulletin Board
What are the right props?
Posted By: Jim Wolfe
Date: Tuesday, 13 June 2006, at 4:40 p.m.
I am in the process of trying to eliminate a vibration in my B28 Moppie. After pulling the props, I find that one prop is of an older style (bent blade). Style from the 60's. The other is a style from the 90's.(both 17 x 17) The shafts are 1 1/8 inch. New props 17 x 17, I am told are 1 1/4 only without special order ( 5 to 6 weeks for 1 1/8 specials and at a cost of $ 530 ea. ) I was told I can get a shim that would bring the 1 1/4 down to 1 1/8. If I go with the shimmed 1 1/4 props, is that a proper fix or is it something that is going to cause problems? The one prop with the style from the 90's is already presently shimmed. Is that ok? the old style is w/o shim but is in need of rebuild as it does have a slightly bent blade. I don't know if I should have it rebuilt or replace it with a new shimmed prop the same style as the other prop. What do you think? If you can make sense out of this you'll being doing good.
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