Sender: <marv@lancaironline.net>
To: lml@lancaironline.net
Date: Tue, 16 Oct 2007 09:41:03 -0400
Message-ID: <redirect-2389461@logan.com>
Received-SPF: none
 receiver=logan.com; client-ip=216.148.227.151; envelope-from=mjrav@comcast.net
From: "Mark Ravinski" <mjrav@comcast.net>
References: <list-2388490@logan.com>
Subject: Re: [LML] Re: prop drag
MIME-Version: 1.0
Content-Type: text/plain;
	charset="UTF-8"
Content-Transfer-Encoding: 7bit

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
>
> --
> For archives and unsub
http://mail.lancaironline.net:81/lists/lml/List.html
>