Hi Paul,

 I've misplaced the email with the picture of the radius applied to
 the lower firewall to help with cooling. Do you have that handy?

 Thanks,

 Chris Cosman

 Is one of these the picture you had in mind Chris?

 --
 Paul Lamar ...No rotor no motor.

 Paul,

 Can you tell me what the quilted firewall blanket is in the image called
 "Real-ES-M-Steitle-FWF.jpg"? Also, would you happen to have, or
 know of, a
 source for it?

 Thanks,

 Jack Hilditch
 RV-9A 13b (under construction)

 Mark told me but I forgot.
 Mark S, what is it and where did you get it?
 --
 Paul Lamar ...No rotor no motor.

Paul,
I know that you have seen it but most of our guys probably haven't, the
firewall of the Nemisis NXT is contoured at the exit to improve airflow.
Starting off with a properly contoured lower firewall will help airflow.
Bill Jepson

Are you talking about this Bill?

Paul Lamar

Yes Paul, and that is an even later variant using a exhaust augmenter
scheme.
The original one I saw on Sharps first unit was a larger oval shaped
opening.
This must be an attempt to get better extraction.
Bill Jepson

IMHO it was not done right. At 300 MPH the exhaust kinetic energy alone,
pointed
in the right direction, can generate tens of HP. In a P51 at 400 MPH
it was worth well over 200 HP as I recall.

Paul Lamar ...No rotor no motor.

While I agree that they are throwing away some thrust, they are also
nearing the
limit on the amount of in-cowl cooling that can be acomplished even
using  spray
bars and Anti-detonation fluids. I'm not sure which is more important.
Bill Jepson



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