Having said that here is another anecdote for you. Someone got the
bright idea of shaving the scoop off a P51 Reno racer and replaced
it with a NACA duct. Guess what?
Paul Lamar

Paul, I don't think anyone is disputing that a P-51 scoop is

better than a NACA scoop. Yes, I read the NACA papers. I think
some of us canardians have made mid-stream decisions to go the
rotary route and are trying to do so without taking a chain saw
to the bottom of the plane (just yet). It has also proven out
that the P-51 scoop slowed the plane down. Maybe we are all hard
headed and don't want to hear the truth but would rather hang on
in naive optomism that until someone flys this configuration and
finds out -IT WON"T WORK-

Take a closer look at the flow.jpg and you can see the baffles

that are wrapped around the cylinders... I do not know what the
total open area is for the 4 baffles but it can't be that much.

If any air is going to go throught the canard cowl, it has to

get through those 4 slots.

How that area compares to the total of one radiator, one oil

cooler and one intercooler I have no idea but my guess was that
it would be less than the standard Cozy/Lycoming configuration.

Also when in the climb configuration is there a higher pressure

under the belly of a canard?

...Chrissi

I am not here to solve the cooling problems on an air cooled engine Cozy.
Bug Nat Puffer. It is his responsibility. If you want to cool your
13B use a P51 scoop. Sorry about the drag.

Paul Lamar

Give it up, Chrissi. If it doesn't work, I'll buy Paul another "told you so"
badge and buy a chainsaw. If it does work, I'll publish detailed results and
buy a "nah nah na nah nah" badge for myself. In the meantime, build your
strakes. :)
Regards,
John Slade

OK I am feeling a bit better now. Been sicker than anyone should be and still be alive.
Pay attention. I am only going to talk about this once.
Here is how to cool an AC engine Canard about as well as can be expected
using the belly NACA duct. Divide the flow into three parts beyond the lip. Center for
the carb. Duct the outer two to closely fitting muffs that just fit the bottom
of the cylinders. Parts of this may have to be made from SS. Wrap the
relatively thick 321 SS exhaust pipes with high temp insulation and keep them
out of the closely fitting muffs that just fit the bottom of the cylinders. 
The exhaust pipes are heating the air before it gets a chance to cool
the cylinders and valuable cooling air is escaping around the exhaust
pipes openings in the cowl. They must be isolated.

In no way shape or form will this work for rads and a rotary. Don't even try.

This is what you must go through to make a down draft cooling system engine
work in an updraft cooling system airplane. Special updraft cooling
system engines with exhaust ports on top of the cylinders are available 
in certain sizes for use in updraft cooling system airplanes. Duh!

If you think this is a lot of trouble use two P51 scoops on the top of 
the cowl and cool the O-320/IO-360 like they were designed to be cooled. 
Down draft cooling! Use a boat tail with vertical cowl flaps. Now you won't
have to worry about the exhaust pipes heating the air and leaking off
valuable cooling air. Use a small belly NACA duct for carb air.

Paul Lamar
 
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