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Making wood propeller?
On Sun, 31 Jan 2010 19:07:19 -0800 (PST), flybynightkarmarepair
wrote: On Jan 30, 2:49*am, Stealth Pilot wrote: the crush strength of the wood in the hub area is likely to be the critical factor in selecting the wood species used for a propeller. The state of the art in prop bolts for wood propellers: http://www.cozybuilders.org/Oshkosh_...lle_Washer.pdf The better the prop is sealed, the less the variance in humidity will be, so it's important to seal and finish a wood prop. my tailwind has used belleville washers on the prop since it was built. first flight was october 1985. without doubt you have the wierdest belleville washer setup on the prop in the pdf's I have ever seen. the old bellevilles on my prop are not much bigger than a standard aircraft washer. the prop uses a steel crush plate. the bellevilles are it under the bolt head. there are no other washers used. ....which reminds me that I need to replace them and I have no idea what size was used. they work wonderfully! I use 120 inch pounds of torque on each bolt. Stealth Pilot |
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