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Date: Wed, 20 Feb 2008 15:20:13 -0500
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Subject: Re: [LML] Re: Cold Induction, Power, and Speed
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From: "John Schroeder" <jschroeder@perigee.net>
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Fred -

On the old navigation trainers (T-29A, B, and C models) the Air Force had an augmenter tube into which they dumped the exhaust from the R2800 engine - one on each wing. It worked well and also was a source for hot air to deice the leading edges of the wing and horizontal stab. The Airline versions were Convair 330 and 440, I believe, and i don't know if they had that installation. Now that dates me for the world!!

Scott - This installation had a very nice, throaty roar to it Not too loud.

John Schroeder
LNCE


>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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>