Paul,
 I was out at the airport today and got the firewall measurements you
 asked
 for.  I added station 19 because this is where the outer edge of the
 tunnel
 is located (Your drawing shows this as station 18.)

 Referring to your drawing, the dims are as follows:
   0 - 1/4"
   3 - 0"
   6 - 1/4"
   9 - .7"
 12 - 1.4"
 15 - 2.55"
 18 - 4.8"
 19 - 5.8"

 A 5" radius would be about right for the tunnels.

 The measurement on the front motor mounts is the outside-to-outside
 dimension and is 20 1/8", best I can measure.

 Thanks,
 Mark

 You lost me there Mark. Is this the dwg you are referring to?
 If not send me the dwg.

 Paul Lamar

 Paul,
 I can't locate the drawing you sent, but the "0" point was at the upper
 right motor mount point and it went down the side in 3" increments.  The
 19"
 point is at the outer lip of the exhaust tunnel.

 Mark

 Do you have MS Paint?

 Paul Lamar



 Paul,

 I think I have the drawing you did of my firewall on my home PC.  I'll
 check
 tonight.

 Mark

Paul,
Here's the marked up drawing of the Lancair ES firewall with dimensions.

Headed to the airport,
Mark S.

Here is the Dolly Parton version.

Paul Lamar



Yessssss!  Looks great!  Big improvement over the "smiley face" of my
current cowl.  Do you feel the intake will be enough to cool 375hp?

Mark S.

No problem at cruise. I would still put a big cowl flap
where you have it now for high angle climb outs. During
climb out and takeoff additional aero drag has no effect on
takeoff distance or climb rate. It is all a matter of power
to weight ratio and prop pitch in those regimes.

Paul Lamar