Paul, Do you know of any work that has been done with rotaries in
which rollers were used at the tip seats in order to reduce
friction?

Next question. Do you know if anyone has played around with either
graphite alloy for rotor and/or housing in order to eliminate tip
seals? jd


Friction is not a problem in the rotary. It is much less than a
piston engine.

Nor is seal life. Silicon Nitride seals have a projected life of
20,000 hours.

That is longer than I will live :)

Paul Lamar

I fully agree with what Paul says.

Besides this, rollers would not really work, and neither would a
rotor without seals, because no matter what you do there will be some
tolerances left that would result in leaks - if not from
manufacturing then from thermal expansion.. That's why piston engines
still have piston rings :-)

Poul

Poul Henrik Woelfle <ph.woelfle@woelfle-engineering.com>

BTW Poul I contacted the company in Germany that makes the
DD15 TC gear box but have not heard back so far. I was hoping to find
out if they could make a smaller one for our use.

I think they are called Mistic Gmbh  or something like that.
Very finely machined.

I'll I have the gear box in the hangar so I will get back to you
on the email address.

Paul Lamar