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In a message dated 7/26/99 6:08:55 AM Central Daylight Time, wrumburg@cdicorp.com writes:

<<     What are the "doublers" you've mentioned? Maybe they're peculiar
to a constant speed propeller?
   At any rate, my installation, with only an aluminum spinner
backplate and Lancair's carbon spinner (fastened with only stainless pop
rivets and nutplates) has functioned well, with no problems whatsoever.
 >>

Bill,

"Doublers" are approximately 1.5 inch by 2.5 inch by .125 plates located at the backplate bolt holes to reinforce the backplate because of reported cracking around the holes.  These are supplied by Lancair.

My Lancair purchased spinner (circa 1990) is made of fiberglass with only the aft 1/3 containing carbon.  The Lancair recommendation was to reinforce the blade cutout with glass because of reported cracking around the forward edge of the cutout (ahead of the carbon).  I have also done that process.  The spinner has fine cracks in the cosmetic coating (paint) from flexing.

Note: Late reply is due to Oshkosh attendance.

Thanks,

Scott Krueger
N92EX

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