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

We certainly can do a 1/4 scale part.. I'm not sure we'd get alot of useful info
from doing so?

Re- measurements for contours, I've found it's generally easiest to just
trace the profile on carboard and then measure the tracing.

fwiw

Jarrett   [btw .. it won't be 'big bucks'..   just materials
and cost price for the machine]