Dick Gregory wrote:
 >
 > Hi all,
 >
 > A bit of rambling here. Any advice is very welcome.
 >
 > My 13B is scheduled to be delivered on Thursday. I have been holding

off on

 > some of my design decisions until I can get a physical look at how

things

 > are going to fit.
 >
 > Since the LongEZ firewall is so narrow, things are tight. I really

wanted to

 > eliminate all bumpouts on the cowling, but I don't think it can be

done.

 > Also, you guys have convinced me to keep the male belly scoop instead

of the

 > NACA design. In addition to the belly scoop I will need one for the oil
 > cooler. I plan to put this one under the left strake similar to

Perry's. I

 > don't know whether to draw induction air from one of the scoops or put

a

 > separate one under the right strake.
 >
 > I think I will put a bumpout under the bottom corner of both sides that

flow

 > back from the scoops. This will provide room for the oil cooler ducting

on

 > the left, and a muffler on the right.
 >
 > I am considering a radiator from the Chevy S-10 pickup. It is 15 by

26.5

 > inches. 1 inch or 1.125 inches thick depending on transmission and A/C.

I

 > wanted to mount it horizontally above the belly scoop for updraft air,

but

 > that would make the cowling very fat close to the prop. If I drop the

front

 > to the bottom of the scoop and raise the back just below the redrive I

can

 > get a much better taper. This means downdraft air. Will I have problems

with

 > debris damaging the radiator in this position? Perry, what kind of

results

 > have you seen so far with your new setup?
 >
 > Ron Gowan, are you on this list? Did I hear that you are changing yours

from

 > plugs up to pan down configuration? If so, do you have any magical

solutions

 > to the space layout challenge?
 >
 > Dick Gregory
 > LongEZ N613NC
 > Houston, TX

 Sounds good so far. I don't think Ron Gowan is. At least under the
 name Ron Gowan. Want some more pictures of Perry's set up?
 Here is a good picture of his motor mount on the test stand.
 It is a bit overkill and one could go down on tube size to about
 5/8 inch OD.

 BTW Perry did you ever get around to measuring the air pressure
 in front of the oil rad?

 Paul Lamar

I will be using .75 OD by .049 thick 4130 tubing. Will there be an advantage
to using a thicker wall tubing at the firewall attach points? 

There is no advantage to thicker wall tubing at the firewall unless
there are substantial bending loads on the tubing at that point.
Do you have a picture of the mount? A sketch?
Properly designed mounts minimize bending loads in the tubes that
can lead to fatigue cracks. PL

My mounts will
have the shock cushions at the engine mount points instead of on the
firewall. I am using Dave Atkins' mounting brackets.

I guess Ron must be in another list where I sometimes lurk. He is in the
Dallas area and flew his LEZ plugs up for a while and I think is in the
process of rotating it to the auto orientation. This must mean that he did
in fact have some problems with plugs up, otherwise I don't think he would
go to the trouble.

Dick Gregory
LongEZ N613NC

 
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