Based on your drawing it looks like we are talking about different
things. The cool tube is a pipe that runs thru the muffler. It will
be fed continuous cool air via a scat hose from a NACA (maybe) inlet
on the belly. The air will enter the rear of the tube and exit the
front. Originally I wanted to bring the cool air from the nose bowl
area but the new Schertz beam location blocks that. The cool tube
increases the surface area of the muffler tremendously and since it is
provided with a steam of outside air it will significantly knock down
the exhaust temp. So far no one is as excited about this as Ed and I
but we think if is pretty neat. Jerry
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Hi Jerry/Ed;
I disagree with you Jerry, I too am excited about this also as I'm sure are others on the list. I personally feel this is one of the biggest breakthrough we've had in the "Muffler Department" and consider it brilliant as it opens up all kinds of possibilities....I was also very glad/pleased to see you and Ed huddle together....I met Ed at SNF and spent sometime with him chewing the Rag and was very impressed with the quality of his products....Plus most importantly, in my book he qualifies as a "Doer Par Excellan't" :)
So this doesn't come as a great surprise to me, and I expect a lot more of the same from you and Ed ;-)
My opinion on the muffler working is very positive.......Here's my reasoning:
Your 6"OD x.065" wall x10"lg body has an internal surface area of 176in2 (incl 3 2" pipe holes)
The 2 donut end plates 5.875"OD x 2"ID " " " " " 48 "
Total Internal surface area = 224in2,
The 2"OD x 10"lg center cooling tube has a surface area of 63in2
224 sq inches of area soaking in an engine compartment's hot ambient will be countered by 63 sq inches of external very cool rammed in air....Put another way, we are subjecting the Muffler to 28% of a much cooler Contact area continuously while cruising.....This is much better than what we presently have right now flying :)
BTW, I would definitely try the very, very best to feed it from the FRONT and exit it to the REAR....It's just more natural, sort of like swimming with the current....Even if it means using a P-51 snorkel....After all we all have one in our face that works pretty good even while not running :-)
Butch
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