Perry Mick wrote:

Here is the latest drawing of my new engine mount for the LEZ, and the
new rad that doubles the volume. This new volume is in the ballpark of
what is in the stock 2nd gen car rad. Shown are the inlet ducting to the
rad, without the side walls.

Perry

Here are my suggestions.
We came up with an easier way of doing that MM after that rectangular

beam scheme

was originally proposed on here. Namely take the lower MM tubes loads

down to the

landing gear bolts. Do away with the two vertical rectangular beams.

Much lighter

simpler and much less welding. Here is one 3D of the new design and a

picture of the cut

away hell hole. Make a couple of 4130 cups that go under the nuts on

these landing

gear bolts. Strongest place in the whole airplane. Makes it easier to

service stuff in the

hell hole too. The P51 type side beams give clearance for a muffler.

Yes, I know about that, but don't really want to cut into the fuselage
structure just yet. I would rather just bolt something on.

Are you still using
the stock exhaust manifold?

Yes.

If you decide to go with a muffler in the future
the P51 type side beams will help. Jerry Hey can sell you a cross beam

that

goes between the gear box plate and the back of the engine that you

can cut down

to your needs. Or you can have one bent up locally. I can send a

drawing of that.

I've already made the beam and front mount and a new oil pan. Another
view attached with those parts turned on.

If you double the thickness of the rad that will restrict the air flow

more

and your NACA duct will work worse than it is now. The ducted fan
did a good job of sucking air into the NACA duct and through the rad.
Without the ducted fan it will not be easy to get the air to flow through
that double thickness rad. The counter cross flow rad design is very good
however.

Paul Lamar

I already lowered the inlet lip on the naca over an inch, probably about
a year ago, so that it is a little bit of a scoop. Noticed absolutely no
difference in cooling with the ducted fan, but it might help with this
rad. I definitely need to increase rad capacity now, and this is about
the only way to do it.

Perry

That just shows to go you how bad it is :) The high velocity air you are
looking
for is nowhere near the opening. An inch is probably inadequate for the
boundary
layer air bleed on a P51 ram air scoop that is that far back on the fuselage.
My guess is the boundary layer is several inches thick all the way back there.
But why guess?

I know you still have my water manometer so put a velocity rake back by
the NACA
scoop consisting of an  array of pito tubes spaced an inch apart and
report back :)

Here is a picture of a velocity rake I built for testing Tracy's airplane.
I wanted to make sure I was reading the real dynamic pressure.

Paul Lamar

Joseph M Berki wrote:

Hi Perry,
         I was surprised to see your AC without the duct.  I am redesigning
the cooling system for the Limo for the third time.  I built a scoop using
the submerged portion of the NACA inlet.  It runs from just behind the
landing brake 5 feet rearward.  The inlet opening is 2.5" X 10.5".  It
expands until it reaches the rad and oil cooler where there is a wedge to
stuff the air up through the rads into the cowling.  The whole thing is
made out of carbon for strength not so much for weight.  I have 18" X 20 to
22" to work with.  The rads will be mounted on a rack that can unbolt from
the airframe.  The scoop can also be removed by un bolting it in case I
have to redesign it.  I will send pics if you are interested.  I don't know
how the rad will be designed but your double volume unit looks interesting.

Joe Berki
Limo EZ

What kind of scoop Joe? Get any pictures?

Paul Lamar

 
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