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