Paul,

 Yes, it's out in paperback on Amazon.com.
 I haven't found a professional narrator I like yet though. The book
 is very movie-like with many characters who appear in  four time
 periods, ancient to present. Interspersed within the story are some
 flying scenes you would enjoy. The book looks at time travel from
 the viewpoint of both metaphysics as well as astrophysics. Time is a
 place is the underlying precept. Could be just another hare brained
 idea though:

 Rotary progress:

 I'm  making up the Aluminum housing and PSRU mounting plate out of
 2024 Al. now. I found that I will have to have to make a new sun
 gear combination, splined shaft, to get a robust connection to the
 drive spline. I'm still not completely convinced on the method for a
 torsional resonator absorber. Mistral used springs and Tracy uses
 rubber. I'll have to make a choice, run it and then see what
 happens. I worry about the increase cycle rate and durability that
 springs would encounter. Having the prop spinning a the same rpm as
 the rotor could potentially  be a good or bad thing. I'm beginning
 to understand there is no one-off solution. Different propeller
 weights and materials will resonate at different frequencies.

 Cheers

 Doug

 Springs give no damping.
 Experience with two entirely different rotary engine and coupler
 designs and with different displacements, both resonating just below
  2000 RPM more or less, acting identically, I conclude there is no
 solution. Idle the engine below 2000 RPM and forget about it. After
 all the prop is turning at 700.

 I gave the book to Robin.

 Paul Lamar

I believe there are some clutch hub springs damped with rubber for heavy
trucks. How about injecting some silicone in the springs for damping?

Dale Davies
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