ram air pressure governed variable pitch prop

I remember seeing somewhere in some rag (SA, AOPA pilot maybe
Kitplanes) a new variable pitch propellor system that used ram air
pushing 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.

Does anyone know what I'm talking about?

Bruce Meacham

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.

the Silence got one of these props

http://www.silence-aircraft.de/verstellpropeller-e.html

(scroll down at bottom of page)

-loef (www.loeff.de)


"Richard Riley" wrote in message
...
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.

On Thu, 15 Apr 2004 09:51:05 -0700, Richard Riley
wrote:

: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.

I remember now - Avia, from the Czech Republic. It was being imported
by Hamilton Standard, now it's majority owned by MT. I don't know if
it's the one you're thinking of, but it's in the ballpark.

That's it!

Thanks,

Bruce Meacham

"G. A. Loeffler" wrote in message ...
the Silence got one of these props

http://www.silence-aircraft.de/verstellpropeller-e.html

(scroll down at bottom of page)

-loef (www.loeff.de)