Alan Tolle wrote:

I like the principle in this idea, Paul, and I like the looks even better.
The structural modifications are feasible.  I suspect some of the exhaust
gasses would end up in the ducts, but there would be a lot of mixing with
fresh air by the time they got there.

Thansk Allan. Coming from a man of your expierence that is a good
complement.

The two inch cores are cooling overkill. If somebody would build a test
rig
I think we could use one-inch cores and cut the weight of the water
back there by half. The aluminum cores themselves weigh little.
I need to go to a junk yard and find a Toyoto core and weigh it.

The input ducts would take some space out of the baggage compartment, which
is a little on the small side in the first place.

That wouldn't make any difference though, because you are going to have a
single place airplane anyway.   A normal passenger in the rear seat puts the
CG nearly 3 inches aft of the aft limit.   In my experience in flying the
RV-4 (1500 hours worth) I think this would cause one hell of a problem in
the landing task, which problem I would not want to wish on even my worst
enemy.

Perhaps somebody should give some thought to making the tail feathers
out of carbon fiber. Carbon fiber rudders and elevators really
pay off big time as the static balance weights weigh a lot less as
well. Carbon fiber is much stiffer than aluminum so flutter
considerations are better yet. The stab and vertical fin
could also be made from carbon fiber. Since we would be
pushing the VNE a better flutter margin would be needed.

I went to a meeting recently of the SAE aircraft vibration 
committee and there was a Phd speaker there from the FAA that said
a 10% improvement in GA aircraft structural stiffness would result
in a 50% reduction of in-flight breakups.

If all else fails you could mount the battery's up in the cowl
on each side of the PSRU rather than between the pilots feet
where it is now. They would get a nice blast of cooling air
up there and the copper to the starter would be real short.

What your design needs is a 20B up front.   (I have actually given that
project some thought --- it would sure be a kick.)  It is either that, or a
really long nose.

Man that would be one heck of an airplane!

BTW Allan what size rad water pipes did you use?
 
Paul Lamar
 
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