The Porsche aircraft engine (indeed, no Porsche engine since the early

50s) has **nothing** in common with VWs other than air cooling and
being a horizontally opposed piston engine.  It is/was based on the 911

flat

6 which is *EXTREMELY* durable - **many** Daytona/LeMans 24 hr class
and overall wins over the last 30+ yrs. You might as well call a 520
Continental
a VW based design.  I've built *many* VWs (car/ few airplane) and own a

911

and fly two Continentals and a Lycoming.

If you want to really do the *right* thing for an aircraft rotary, you

need

to learn
from many years experience with piston aircraft engines.  You need a big
enough displacement engine to make your required HP at 2800 RPM max
and you need to air cool it.  These parts of the aircraft engine

optimization

over the last 50+ yrs *are* correct.  Water cooling is subomptimal as is

a

geared
engine.   No offense on the Mazda - it is the only thing available.  I am

only

talking about a multimillion $ clean sheet of paper design.  Near zero
probability, but an aircooled, direct drive, peripheral ported two rotor
with proper thrust bearings designed in and burning two-stroke oil

injected

from a separate tank, with a fuel and ignition system like Tracy's would
be *EXTREMELY* good and would really be a new breakthru in aircraft
motors.   Dream on.  In the real world the Mazda can be made to work,
we all need to make the best and safest systems to keep the whole

installation

as reliable as the core engine.

Bill
Long EZ builder & pilot
mechanical engineer

George Lendich wrote:

Bill,
What is a 911
TIA
George (down under)

Surely you have Porsches down under George? A 911 is a Porche model.

Paul Lamar
 
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