Hello Paul,

thank you for the "Sunstrand paper" - one more publication for my collection
... :-)    Indeed the title is rather irritating ...

In the patent US 3920360 from General Motors (filed in 1974) you can see,
that they have had the same idea with steel + chrom ...

Some time ago I've seen something about ceramic coating of Mazda housings by
a company in the U.S. - perhaps I find it again ...

CCR (Charge Cooled Rotor - not the Rock group ... ;-)   ) - I think, the
main reason to do so is the price. For standard engines like the old F+S or
the Freedom engines (?) high power is not important - but the $ ticket is

Remember the small F+S industrial rotary engines - they had to "fight"
against the very cheap vibrating 2 strokes ...

The "good old" people at Yanmar switched from OCR to CCR too - because of
the high production cost ... As a company you have to compete on the market
or - finish / stop your business ...

You do not need any oil seals + O-rings, no middle / high pressure oil pump
... + your fuel is well mixed after passing the rotor. Of course that's not
the way to build a high performance engine ...

By the way, I've read, that a company called "Barger Tech" has bought all
the stuff of C-W, John Deere, RPI ... + plans to do ... nothing ?

And the Pratt + Whitney way (for the Air Force ?) also looks a bit like the
continuation of the old John Deere developments with 2 injectors ...

But, I don't want to waste your time - the TTC project is waiting ... ;-)

With kindest regards

Frank Herfert.

Barger Tech was the former Rotamax.  Eric Barger. There is a warehouse in Florida
full of that stuff.

That patent is real strange. Mazda was already manufacturing that when that patent
was granted.  Things must have been happening fast and furious in those days.

I had a 1973 RX2 12A with those kinds of rotor housings.

If they had spent one tenth of the money on turbo compound that they spent
of stratified charge the rotary engine of today would be way far ahead in
utilization. Fortunately Mazda is working on F1 style hybrid turbo compound
as we speak. I sure hope they get it to work.

Our new oil squirter to cool the rotor is cheap enough with out
the sever VE penalty of charge cooled.

Paul Lamar

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