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


Does this mean we're ready to go? By the looks of it that will have to
be made in 4 pc's [split down the centerline and a center-water line]
due to the undercutting on the tunnels [no big deal]. It's possible I may
be able to do an undercut tool-path but will have to see the model to
know for sure.

Are we also making the buck's to pull the inside ducting?

Jarrett

It is up to Mark of course.

Maybe we could do a 1/4 scale as test. Would not that be cool?


Paul Lamar


Paul,

Is the upper curve of the firewall accurate as drawn or do I need to get
some measurements like I did for the sides?  If we're good to go as is,
I vote to move forward.  We can do a 1/4 scale if you want.

Mark


Would not hurt as a double check.
Also a check on the distance from the top of the firewal to
the prop flange.
Same on the bottom so we can get the angle right.

Also a contour on the bottom would help. Once you spend
big bucks for a buck you want to make sure it fits :)

Please take the bottom of the cowl off and take some pictures.
looking up. I have a few questions about the landing gear mount.
There is a tunnel that goes back beyond the firewall right?

Paul Lamar