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Date: Sun, 16 Nov 2008 18:04:28 -0500
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From: mmcmanus@grandecom.net
Subject: Re: [LML] Re: Prop Length for 360
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The hub is close to what you identify...HC-F2YR-1
The blade design is....F7666A-6  (is that [76" less 6" = 70"])

Someone mentioned that the 320 could use a 70" prop, but it sounds like a
different blade than what you identify.

I'm really confused now???
Thanks,
Matt McManus

Quoting Sky2high@aol.com:

> 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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