This is a comprehensive web site on the rotary turbo compound. Most
of the recent patents are assigned to Pratt & Whitney. One of the
persons named as an inventor was on the news letter for years back
in the late 90's and early 2000's. That is Jonathan Lauter.

I suspect this is an attempt to keep somebody from making them,
certifying  them and selling them competing with the PT6 :-) Some of
the patents run out in 2017.

You can use http://www.pat2pdf.org/ to get free copies of the
patents

Here is a short list. You can cut and paste them into pat2pdf

5471834 7753036 7775044 20090007882 04074655

Attached is the most relevant patent. Also a screen capture of some
of the patent text mentioning the Mazda rotary :-)

Much of this was before the Iannetti silicon nitride seals increased
the apex seal life to 20,000 hours.

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Even  Rolls Royce was interested.

Here is a RR patent integrating the Wankel rotary engine with a high by pass turbo
fan engine.

You may someday be flying in an airliner with a Wankel turbo fan engine.

BTW Caterpillar came with the this basic chart of how the turbo compound
turbine operates with temperature and RPM limits. This is why one
needs an RPM sensor on ones turbine.

These guys were all thinking about it. We are doing it :-)

Paul Lamar

All of this makes me sad that you gave up.  It seemed like you were pretty close.

Dave Klingler

This takes a lot of money and time. Up to a $1000 a day for a dyno. I am not made of money
and time flies when you get as old as I am.

I did my part by lecturing the International Formula one engineers in 2008 on turbo compound
and they took up the cause.  Each team spends up to 800 million dollars a year. Much
of that money is now going into turbo compound hybrid engine development.

I suspect Mazda will benefit somehow on what Honda is developing for F1.
That will be incorporated in the new RX9 they are working on.

All the recent patent activity by Pratt Whitney and other large engine makers
proves  that they are thinking about it and the Wankel engine.

Our fabricator Dan Gray and pilot will probably be called upon to implement some of these
engines in aircraft as he will go down in history as the holder of the time to climb record
holder with a Wankel.  If we get the record :-)

Paul Lamar

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