Matt,

Interesting.  Can you give us the hub and blade designation - perhaps  it is
the setup that 320's use. That is: hub HC-F2YL-1F with blades F8468D-14  (84"
less 14" = 70").  I have gone thru, uh, several blades and it was some  years
ago that the 320 set-up went from "normal" to "experimental".  Oh  well.


Scott Krueger  AKA Grayhawk
Lancair N92EX IO320 SB 89/96
Aurora, IL (KARR)

Pilot  not TSO'd, Certificated score only > 70%.




In a message dated 11/15/2008 6:36:51 A.M. Central Standard Time,
mmcmanus@grandecom.net writes:

I'm in  the middle of getting my Hartzell 2 blade prop overhauled for my
Lancair
360.  I got a new hub at 50% discount from Hartzell to  eliminate the
recurring
eddy current inspection. The prop shop doing the  overhaul has issues with
the
blades and they will not issue the formal 8131  (I think) paperwork for the
overhaul.  The problem is the blade  length.

I bought the airplane 3 years ago and it had an overhauled "0"  time prop
when
the airplane was built in 2002. The blades are 70" long  according to the
prop
shop.  They also say that the Hartzell  recommends a 72" blade. But Hartzell
also allows a 68" blade for the Lyc  360.  They do not however, recommend a
70"
blade.

The question  is, since I've had no problems or vibration issues with my 70"
blades -  should I be concerned? I guess Hartzell's recommendation is based
on
some  harmonic resonance or some other vibration related things (which  are
outside my knowledge).  Does my 70" blade length provide cruise or  climb
capabilities that are greater or lesser than a 68" prop.

I'm  planning to have the 70" blades reinstalled on the new hub, and the  log
entry will just say the standard overhaul stuff (except the IAW stuff),  and
it
will specify "experimental A/C usage only."

Any  thoughts?

Thanks,
Matt McManus
lnc2 360
408 hours total time  airplane.




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