X-Mozilla-Keys:                                                                                 
Russell Kent wrote:

Paul wrote:

As I recall Francesco told me they gave up on titanium rotors.
Too much heat transfer causes a loss of power. Now I don't
know if a ceramic coating on the titanium rotors would recover
some of that HP. Titanium rotors should allow the engine to run
up to 12,000 RPM or so I would guess.

Although ceramic is a good thermal barrier, its effectiveness is proportional to
its thickness (as someone on the list reminded me a while back).  IMHO you'd have
to have a fairly thick coating.

Russell

Keep reading Russell. I was wrong about the thermal conductivity.
The problem is not enough thermal conductivity to keep the apex
seals cool. In other words the oil in the ti rotor can not cool
the apex seals well enough.

Paul Lamar
 
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