Yes, if I were building today, the bottom of my cowl and airframe would  look
a lot different. Cooling drag reduction thru augmentation with a benefit
from a wee bit of thrust to boot, ahhhh.  Not to mention the ear splitting
addition of the noise to scare those on the ground and in the air.

In a message dated 2/18/2008 1:47:04 P.M. Central Standard Time,
fredmoreno@optusnet.com.au writes:

“There  is a free lunch - or at least a cheap one.”
Right you are,  Scotty!  I merely was pointing out that one has to pay for
more  horsepower, or work for drag reductions.
However…..
There may be another  nearly free lunch.  Exhaust thrust.
I have a WWII NACA  tech paper discussing the theoretical and experimental
work done to determine  the potential thrust from the exhaust of aspirated
piston engines.  The  faster you go, the more effective it can be.  So after
evaluating all the  cooling drag reduction work I have done, I plan to work on this
area next.
First I will have to  wade through all the equations and data and attempt to
understand and  interpret it with my ever-shrinking neuronal capacity. That is
a project for  the latter half of the year. Trading more back pressure (and
presumably some  power loss) for thrust improvement (via exhaust nozzles) is an
interesting  trade-off.
It is not a simple  one.
“Combining power  gains with drag reductions [and perhaps  some augmentation
of exhaust thrust] results in  significantly greater performance.”
Want to try some  experiments?




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