You could always do something like this :)

Paul, The problem with that drawing is that
too many people are mechanically ignorant and
to them that drawing LOOKS feasible! Bill Jepson

I must reply that I am NOT mechancally ignorant, and that method
of power extraction WILL work , and I challange you  to explain why

it

will not. A planetary reduction is certainly easier, but this system

will

extract power at 1/3 eccentric speed with the comenserate 3 times
the torque for the same HP. the path of the U joint is the same as

the

rotor.
and may be balanced in the same way. The power of the rotary is
produced by pressure area terms on the rotor. If you "grab" any

rotating

element in an engine you can extract all the power from that

element,

just as some Continentals drove the prop off the cam shaft. I think

if

you really study that drawing, and review the operation of the

Wankel,

you will have to agree. Vance Jaqua - graduate engineer with almost
50 years of experience in the design and analysis of aerospace
propulsion systems.

It looks like you are getting torqued Vance :)

You need to explain what you are going to do with the e-shaft.
Does it rotate or stand still? If it rotates what are the loads
on the phasing gears? What happens if you extract power from
the e-shaft? Also your drawing showed two rotors and
obviously the second rotor does not enter into the power generation
in this mode.

Speaking of torque as I recall you wrote an article for alternative
engines called something like lets "Torque about Horsepower.
If you don't mind I would like to OCR it and publish it
with credit to you of course every time the subject of
torque verses HP come up again.

Paul Lamar

That looks great.  The power from the second rotor would be transmitted
through the e-shaft to the first rotor so both are contributing to the
power output.  Just a few minor problems to work out:

You still need something to replace the functions of the end housing
that you have removed...  re-route the oil and water passages, find
another place to put the fly wheel, seal the combustion and compression
chambers, re-calculate the loads on the stationary and rotor gearing as
now sometimes the e-shaft is pushing the rotor instead of the other way
around, balance the weight of the u-joint and drive shaft through their
complex elliptical motion,  contain the oil o-rings, hold the rotor in
place, and provide a journal for the e-shaft.  That last part is the
hardest.  How are you going to hold the e-shaft in place while the
u-joint rotates around it? It will have to go unsupported which means it
will have to be stiffened and still probably still be as weak as a
Lycoming crank shaft. Changing the size of the e-shaft will require
changes to the rotors and other side housings.

You could probably do it for a few million, maybe you could get Moller
to help :-)

Or you could slap on an RD1-B.  :-)

Dave Leonard

Rotor motion is not elliptical Dave. It is planetary. Sometimes
the wankel is refereed to as a planetary rotary engine.

Paul Lamar
 
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