Thomas Parkes wrote:

Tom,
Can you tell me the BL of you prop flange, or just the measurement from

the

firewall at WL22.  I'm using a different psru as you, so my overall
engine/psru length is different.  The Lancair manual is no help here.
Thanks,
Mark Steitle

For Mark Steitle, et.al.

    I know what you mean.  It is easy for installing standard Continental
engines (IO-360ES or IO-550), just bolt the engine on the mounts and build
the cowling to the prop flange.  I was lucky, as my neighbor was installing
an IO-550 in his ES.  I simply measured the position of his spinner backing
plate (no prop flange as such on a Hartzell) and adjusted my prop flange to
the same BL.

    Here's the data you requested: From the face of the firewall at WL 22,
with firewall blanket installed, measure forward 47 1/4 inches.  That's the
face of the prop flange.  To double check that measurement, it should be
approximately 24 3/4 inches forward of the nose gear strut assembly face
(measured parallel to the longitudinal axis).

    After all this careful measuring and mounting of the engine, I purchased
my IVO prop and discovered two inches of adapter plates and slip rings that
I didn't know about.  Result: my prop was pushed two inches farther forward
than planned, and I had to add an inch to my cowl length.  I think it looks
better, and with a light prop I still came out OK on CG.

Good luck!

Tom Parkes

 
The AirCraft Rotary Engine NewsLetter.  Powered by Linux.
ACRE NL web site. http://home.earthlink.net/~rotaryeng/            
Copyright 1998-2002 All world wide rights reserved.