Just a guess.
I doubt that the accuracy of the data taken was his highest priority at the
moment.

Mark Ravinski


----- Original Message -----
From: "Tom Thibault" <tthibaultsprint@earthlink.net>
To: <lml@lancaironline.net>
Sent: Monday, October 15, 2007 7:41 PM
Subject: [LML] Re: prop drag


> Another data point (perhaps not relevant to Lancairs).
>
> A friend flying an RV-7 just recently had a total engine seizure while in
flight and, thank God, dead sticked to a nearby runway without airframe
damage or any injury.  Well, maybe he and wife Pam needed new shorts!
>
> His description of the incident lists a descent rate of ~1,400 FPM during
the glide.  That RV has a 180 HP Lyc IO-360 with Hartzell CS prop.  By
comparison, my LNC2, with the same engine prop combination, obtains an idle
power ~500 FPM descent rate in full coarse pitch and ~1,500 FPM in fine
pitch.
>
> Is it surprising to anyone that a stopped, coarse pitch prop in an RV
would result in such a large descent rate?  I would have expected that the
RVs stopped prop descent rate would be much closer to an LNC2 with a
windmilling coarse pitch prop.  If his experience is normal for an RV, does
that mean a windmilling fine pitch descent would be 3,000 FPM or more in an
RV?
>
> Any thoughts?
>
> Tom Thibault
>
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