Sender: <marv@lancaironline.net> (Marvin Kaye)
To: lml
Date: Sun, 02 Jun 2002 11:45:24 -0400
Message-ID: <redirect-1254244@logan.com>
From: James Frantz <LFrantz@compuserve.com>
Subject: Non standard metal props on Lancair 320/360
MIME-Version: 1.0
Content-Transfer-Encoding: quoted-printable
Content-Type: text/plain;
	 charset=ISO-8859-1
Content-Disposition: inline

Just a little history about Hartzel props on a 360.  We had two accidents=

that I know involving prop separations on 360's.  One involved the much
photographed  red factory Lancair which resulted in one fatality.  Anothe=
r
involved a blade separation with the engine mount bending and loosing par=
t
of the cowling.  In this case the pilot was able to get the Lancair on th=
e
ground even though the visibility was near zero due to oil all over the
canopy.  Keep in mind that a prop separation is bad because the visibilit=
y
may go to zero and the CG will move way aft of the aft limit.  There will=

be other minor problems to deal with too that are obvious.

It is imperative that the prop/engine be matched to prevent harmonics fro=
m
destroying either especially with the heavier metal props. Lancair provid=
ed
this testing and the results are well known.  Stick with the tested and
approved engine/prop match else realize you are taking additional risks. =

Also realize that even an approved match may have some MP/RPM limitations=

as is the case for the 360/68" Hartzel combination.  =


James B. Frantz
Proprietary Software Systems, Inc. =

www.angle-of-attack.com
LFrantz@compuserve.com
(952) 474-4154