Russell Kent wrote:

After Bob has the lower cowl fitted, have him mark the exhaust pipe
where the outside surface of the cowl meets it (well, for heat
reasons the cowl most likely won't actually *touch*, but you
understand my drift).  Then make a roughly 35 degree cut across the
exhaust such that the cut piece can be rotated 180 degrees and
re-welded.  Voila', a backward-pointing exhaust pipe.  Blasting
exhaust straight out from the cowl is draggy.  For the
imaginationally impaired, the end result will look like the square
exhaust pipe has a dog leg in it.

Bob White replied:

I'm thinking of just cutting it off at an angle (long part in front).
Maybe about 4-5 inches beyond the cowl.  I have an antenna right

behind

there which I'm hoping I won't melt, but wouldn't want to point the

hot

gasses at it.  I may have to move the antenna.  I could weld a short
section back on at that angle if it seems necessary.

While moving the antenna would probably be best (for the antenna), you
*might* be able to make the cut have a *slight* miter so that the
exhaust is blasted slightly to the side.  Think the P-factor vector out,
and point the exhaust to cancel it slightly.  Or if the antenna is not
currently dead center in the exhaust blast, point the exhaust further
away from the antenna. You only want a very slight miter however,
because now the relative wind is going to try to twist the exhaust pipe
(it looks like a chin rudder).

Russell Kent

The Rotary Engine NewsLetter.  Powered by Linux.
ACRE NL web site. http://home.earthlink.net/~rotaryeng/            
Copyright 1998-2004 All world wide rights reserved.