This is what it will look like. Drawn a long time ago. Too expensive
  to build and sell but OK for a one off Reno Racer. The Gov is a $1000
  bucks alone.

  Paul Lamar


Why would you elect to go this way when an electrically controlled C/S unit
controlled by the EFI computer would be much easier.


Kevin Alderman
A&P, GROL, ASEL
Comm/Inst


I think it is Hartzel that supports the Sport Class racers with free CS
props.
They do it for the PR.  The CS metal props are very thin out near the tips.
Necessary to keep the tip drag down at 400 MPH. Take a look at this
chart from
Von Doenoff Theory Of Wing Sections.  If you are not careful transonic
tip drag can
eat all your HP. These props have destructive vibration modes. Stiffer
would be better.

In WW II fast air planes like the Corsair  used steel blades because
steel is stiffer
than aluminium. Also a Corsair could chew the tail off a Zero if
necessary :-)

In theory carbon fibre would work but nobody is doing it
other than my neighbour Klaus Savier. He is not interested in doing a
prop for me to go 400 MPH as he has a business to run. He does not do
props for just anybody let alone me  :-)  Going fast sells his ignitions
systems :-)

As far as I know nobody is making a thin metal electric constant speed
props. The German E.CS props are wood covered with fibreglass and they
are not thin. My hangar neighbour  Tracy Saylor tried them and they were
10 MPH
slower at about 230 MPH than a metal CS back when RV's were competitive
at Reno.

Paul Lamar

Tracy warned about metal gearboxes and the gear boxes, how do you plan to
reconcile this problem?

Kevin Alderman

You mean he warned about metal props? His early gear boxes only had four
pinions and his vibration damper never was effective. We have a vibration
damper on the time to climb that is far more effective.

Will will use that design on the Reno Racer.

We have planataries lined up that are far more robust than the Ford.

Paul Lamar




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