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Bill,
I think we have settled on extending the front over
the coned guide, which could be ( in itself) part of the internal muffler
volume.
To get the internal OD centred on the
external ID, you could put in angled spacers to create or assist
the vortex.
I think the flat area adjacent to the outlets might
be best if it's an addition, in case it burns through, you still have the OD of
the tube
This could be mounted externally to take full
advantage of the RAM effect.
We could say it Jet assist.
It's not really a lie!
What is the recommended
dimensions?
I would like to start working on that - for my
single!
Would look very spectacular all polished-up on a
demonstrator!!
George ( down under)
Tracy,
There are several parts to the VAM pipe. 1. Introduce cool air into
the exhaust to lower the exit temps and make the piping easier in the cowl.
2. Make a second drag surface to absorb some of the exhaust energy and
make the muffler quieter. 3. Draw the air through the muffler to help cool the
muffler itself. The inverted version I just posted might be better for
heat shielding. 4. Lastly cool the exhaust output itself so the pipe
exit doesn't need to be stood off as far to avoid burning the paint off the
belly. Hope that helps. I'm reposting the 2nd version in case you missed the
earlier message to Jerry.
Bill Jepson -----Original Message----- From:
Tracy Crook <lors01@msn.com> To: Rotary motors in aircraft
<flyrotary@lancaironline.net> Sent: Thu, 30 Jun 2005 16:16:15
-0400 Subject: [FlyRotary] Re: P Ports working on dyno
Jerry, That is not what I understood, but I'll take your word for it. I
also would mention that I Muffed the name, I intended to reply to Rusty
,(since you, Jerry are well aware of the going's on with the VAM.)
If Ed DIDN'T put the center tube thru to the tail pipe the VAM simply
WOULDN'T WORK! The center tube must be placed in the center, (in fact
partially inside) of the tail pipe. Did you get the jpeg?
Bill Jepson
From memory (perhaps
foggy) the VAM muffler tested here on my engine stand did have the center
pipe but I don't know exactly where it terminated. There was no tail
pipe on during the test due to clearance with test stand hardware. Ed
K, you around to clear this up?
Tracy (still don't 'get' the VAM
concept)
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