Bill mentioned a constant speed prop.
Here is something I saw at Aero.
Does away with the $1000 Woodward Governor
and drastically simplifies the PSRU nose.
No need for a Gov. gear driven mounting pad on the
nose of the PSRU.

A small electric pump controlled with a 555 PWM
could provide oil pressure to a stock constant speed
hydraulic prop. A high pressure positive displacement
fuel pump like the Walbro or the Airtex roller vane
pump could do the trick.

All you need is a rotating coupling to get the
oil pressure into the prop. There could be a way
of modifying Tracy gear box to do this.

Paul Lamar

Paul,
Do you remember the name of the company
Bill Jepson

No I don't Bill. They shared a booth and I could not find
any info what so ever.

Paul Lamar


I got this off the poster in the back gound. It looks like the prop is only good to 115HP

http://www.alisport.com/eu/eng/eliche.htm
Kevin Bell

It is the principle that is important and not the actual device shown
at the show.

The principle will work with Hartzel and McCaully CS props.
Paul Lamar