Paul,
In an earlier post you wrote, "Rotamax is out of business."
Do you have any additional details?  This is the only bit of info I saw when
running a quick search-engine for Rotamax:
"RotaMax is out of the engine business following a crash of
the Sadler vampire prototype that was powered by one of
their two-rotor versions."

Their website is still up, but it is only one page.
ThanksKevin in Denver

Eric Barger is on here. He can respond if he wishes.

Paul Lamar