One high performance take off and they will come with hat in hand :)

This dwg is good. I think I have enough.

Is the firewall pan galvanized steel? If so that helps as E is 3 times
aluminum.


Paul Lamar


Let me know what dimensions you need, I'll measure them. I've got a handful
of suggestions to help the 801 mount fit a little better too.

I've been installing the connecting arm to the top-center mount point, and
had to fabricate a different mount attach to the center section to provide
clearance between the arm and the top of the renesis front section, among
other things. I'll send photos.




--Kenny A.
http://websites.expercraft.com/kennya/

I think we have it covered by now Kenny.
Thanks anyway.

Paul Lamar

Here are the pictures of the front and back side of the FW pan. It is the
material called out in the prints, galvanized steel, 26ga.
C. Smith

Craig,
I thought it was pre punched or something. OK no problem you have to drill
all the holes anyway so you can add anything you feel like.

Add in a part like the 801 part that looks like this.
Make it out of galvanized 26 gauge sheet steel.
2 inches wide 3/4 inch deep with 1/2 inch wide flanges.
Bolt the whole works together with 4 10-32 screws.

Won't burn in case of an in flight fire. Stiffer than aluminum. No need for
the brace tube in the back but the top cover over the backside of the
instrument panel should be .032 minimum. If it is .025 increase it to .032.
If it is .032 now increase it to .040.


Kenny, I would still like to see the photos. I was not referring to those
photos. I will revise the 801 mount.

Paul Lamar


Let me get this straight. With the addition the hat section reinforcement,
(full FW vertical if practical, nested with the nose gear stuff) will
eliminate the 2 angle braces of the original beef concept. That's an easier
do, will you be making a run of the top block attach bases?

(radio announcers voice) Sounds like yet another fine product, by Lamar...
C. Smith


Nothing new here as Kenny is doing the same thing on the 801.

The big difference is the 640 cowl is sheeted over behind the firewall.
That makes all the difference in the world.

Not quite done.

Make a bracket like this that goes behind the firewall and is riveted to the
top skin.

You can make the brackets out of .062 thick  4130 sheet and tig weld them.
and rivet them where possible in addition to the 4 10-32 screws holding the
whole works together.

Don't be freaked out by the 1/2 inch bolt going through the rubber ball
joint as that is what they need.

This is not a big enough market to make NC parts.

Paul Lamar




I tracked down the top skin, and it is a carbon fiber composite.
http://forums.matronics.com/viewtopic.php?t=67959&sid=0668103757c01b344c0eb4
aea7b609e6

How does that change the game?

Can I please get a .dwg, or 3D or 3 view of the mount design with some
dimensions referenced to the doddridge plate? The asymmetry kinda throws me
a curve ball, and I don't think I can measure it very easily. Thanks for
your time, I know I'm being a bit of a pest.

C. Smith


That looks like fiberglass. You will still need the 4130 bracket to feed the
loads into that skin. I would layup at least one layer of carbon on the
diagonal on the inside to be on the safe side.

No problem Craig. You do have Qcad so here are some dwg dxf's that should
load.
From those you will get the dims.

The MM trick is set up a piece of plywood to act as the firewall.
Prefab the firewall fittings and the rubber holders.
Locate the rubber holders in space and cut, fit and tack weld everything.

BTW how many people on here can weld steel?

Paul Lamar


Thanks for the files.
The pictures may not be current. I was just at the factory, Mathieu (yes, I
know, he has compromised his credibility) referred to the 2 cabins we were
looking at in process to mating to fuselages, were carbon fiber (they looked
much nicer than these photos).
Your approach to mock up was my plan as well.
I can weld steel and aluminum.
C. Smith

Add another layer of carbon or two because I have no idea
how much is on there now. You still need the steel bracket
as the whole carbon cowl is loaded diagonally in shear down to the
longerons. The steel bracket feeds the loads all they
way along the depth of the carbon cowl.

Are you interested in welding up mounts for other people?
Could help pay for your airplane eventually. When somebody needs
one I'll send them your way.

I can make a bunch of standard firewall and rubber cup fittings
and supply them to people. I have a friend that built
a robot welder.


Paul Lamar