X-Mozilla-Keys:                                                                                 
Vance Jaqua wrote:

I still cannot see where you need "tons of torque" at
low end since static is 6250 probably at least 90
percent of your peak horsepower - well past the peak
torque rpm even for a modified Mazda.  I have erased
the original message and some of these questions may
have been answered - for a number cruncher here - say
again ratio of your reduction? - is 68 inch prop dia
right?- a four blade Warp? - 10.5 degrees at tip? -
what angle at 75% radius? - blade width at 75% rad?
Sounds like you are under propped - near full power at
static and over revving at forward speed.
I know those gyros are horsepower sinks - but do you
really think that you are using up as much power as
Paul is computing - or might you be that far off tune?

Vance

His PSRU reduction ratio is 2.85:1.

I think a rotary has a steeper power curve than most
piston engines Vance. At 6000 RPM it is probably still going 
almost stright up. 6000 is the low end for a racing rotary. 

I would guess Gary's peak power occurs somewhere
around 8,000 RPM. I could be wrong. Paul Yaw probably can
tell by looking at the manifold and the exhaust system on
the picture I uploaded. It is also a function of the porting
of course. 

Gary, what kind of porting do you have on that 12A?
None, street port or what?

Paul Lamar
 
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