Hi,
I'm Christian Carestia, i study mechanical engineering in Italy
and i'm doing a thesis on Wankel engines.  I did a 3d model of
the Wankel SW92, angine for model airplane of year '62, and i
was trying to create a software to help in the construction of
the wnkel engine.  I already can extract geometry and dynamics
parameters, but i can't find a good way to extract the hp/torque
curve.  I have these data:



2.1-DESCRIPTION OF THE MOTOR

The SW92 has the following specs:

Swept volume.............. 9.2 CC
Compression ...............7.4:1
Max Power output...........1.5 HP
Power at 12000rpm..........1HP
Fuel................... Methylalchohol
Lubricant................  10-20% Caster oil
Glow Plugs................ Start 1.5V
Weight.................. 900-930g
Eccentricity................ 3.5mm
Major Radius................ 28mm
Rotor thickness................18mm
Apex seal replacement interval..30 H


with these data, i can find the mean effective pressure of the
engine at 12000 rpm, and i can also extract the pressure at max
power output(i suggested it is 20000 rpm)

Now I can 't find nowhere how much should be the mean indicated
pressure, and i can't find a way to extract the mechanical
efficiency.  Foe the efficiency i have some ideas(i found
formulas for the rotor gears and the bearings) but i have no
idea on how to find a good variation of indicated pressure.

Can you give me some suggestions? i'd really appreciate it
because i have only 20 days to finish the thesis!

I can put your name on my thesis and i'll send you a copy if you
want.



Thanks in advance for your reply!

All the best!

Christian

How did you calculated the Swept volume? The RX8 engine is not
1.3 L. It is 2.6 L. The compression ratio is 10:1 and not 7.4:1
Side port VE is 100%
P-port VE is 120%

Here is some actual data.


Paul Lamar