Mike Pienaar wrote:

Below is an extract from a previous posting. If they only got 190 hp at 7000 rpm
with 10.1 psi boost how come we can do so much better now?



Another illustration from this paper. This is a turbo 12A engine
with a very radical peripheral port. Note the low .45 BSFC at
4000 RPM with an EGT of 1700 degrees F. An Arkay turbo
charger was used... what ever that was. The EGT was 210 degrees over
the TIT rating for the turbine wheel however higher temp Inconel wheels
are now available.  190 HP was achieved at 7000 RPM and
10.1 psi boost.

This was a 12A and not a 13B. Number two I think I was wrong about
the P-port. The 841018 paper did not mention the type of porting done
if any but there was a bad picture of a p-port rotor housing so I assumed
it was a p-port. As I said no telling what was happening as this was
the very early days of applying turbos to rotary engines. they also used
as carb so no telling what the mixture was. They just had rich and lean
jets. No mention was made of ignition timing. The actual paper that describes 
the work is  SAE 820354. 

The authors may be still working for NASA. Phillip R. Meng, Rice, W.J. 
and Pringle, D.P. Perhaps one could search the NASA web site and see 
if any of these guys are still around. 

Trust me. You will get a lot more HP than 190 with 10 psi boost on a modern
13B.
 
Paul Lamar
 
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