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

--Mark Steitle wrote:

Tom,
Thanks, That's exactly the information I needed to know before I
proceed.  I read where you wrote about your hangar neighbor building an ES
with an IO-550 and figured you would have taken measurements off of his
installation and applied them to yours.  Hope your testing is going
well.  How's the noise level with the turbo, and I assume, no muffler?

Mark S.

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