> Titanium and its alloys have really low thermal conductivity. which could
     > limit
     > it's use for the rotor which has thick sectiond that must be cooled. We
     > actually
     > used titanium for thermal isolators in some rocket applications - it has
     > lower
     > conductivity than ceramic alumina - Vance

Vance,
While I'm sure your correct about thermal conductivity of Ti. The other side
of the coin is that it retains it's strength to a much higher temperature than
many light alloys. Since the rotor is oil cooled as well I believe it could be
done, with the problem being the cost of course. I think Doug is being
really optimistic if he thinks $500.00 per rotor is possible. $2000.00 would
be more likely. Not logical when you could run an engine hard and replace
the entire "block" for less than that!

 
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