On 15 Apr 2004 08:39:35 -0700, (Bruce
Meacham) wrote:

:I remember seeing somewhere in some rag (SA, AOPA pilot maybe
:Kitplanes) a new variable pitch propellor system that used ram air
ushing against the tip of the spinner to govern the blade pitch. It
:had not propellor control, no hollow crank, no rpm governer, no
:connections at all. Just when you go faster, the blades bite more
:air.
:
:I've done an extensive web search and all I can find is the Aeromatic,
:which is a 30yo propellor nolonger in active production.
:
oes anyone know what I'm talking about?

A few years ago I saw a prop being imported from the eastern block
(Poland, I think?) that had a spinner with spiral vanes on it. The
spinner was free to rotate from the rest of the assembly, and it's
relative rotation is what controlled the pitch. It was being imported
by a significant US company, but I have no memory of which one.