Hi Paul and group,

An engineer, from Texas related to the NexusMustang Yahoo groop, has
sent me this link.  It is not related to rotary
engine.  But I would
like to share this link with all of you.

http://www.bicambertechnology.com/

Marc Joseph

That has been around for years. Airfoils are VERY VERY easy to test
for lift to drag ratio performance. If it was any good Boeing would
be using it.

Where are the lift to drag ratio curves? The web site is all BS.
A waste of your time.

Buy this cheap book and you will know as much as anyone knows
about wings.
http://www.amazon.com/Theory-Wing-Sections-Including-
Summary/dp/0486605868
Paul Lamar

Hi Paul and group.

I brought the subject of bicamber tech.  So with a little research I got theses data for the group to share.  Please note that Paul Lipps is working with Catto and Bicamber tech as specified on this link.  This Jim Smith was introduced to me by Paul Lipps.
http://www.biplaneaerobatics.com/elippse  Yes Paul you told me I know I know :))

Marc Joseph

Hi Marc,
  I have been flying an Elippse 3 blade propeller (Designed by Paul Lipps) on my 150hp RV-6 for
one year now.
  Last June I tested a 2 blade propeller (Designed and built by Fred Felix) that had the same tip shape
as my Elippse and also incorporated the Bi-Camber Technology.
  Below are the flight test numbers at 4,000 Palt and 10,000 Palt for both props.
 
  4,000 Palt           RPM           IAS(mph)       TAS(mph)       Effective pitch
Bi-Camber             2,778           170.8              183.5             69.7"
Elippse                 2,740           180.8               193               74.4 "        18% more efficient

  10,000 Palt       Bi-Camber             2,695           149                  177.5            69.5"
Elippse                 2,655           157.6                184.4            73.3"          14% more efficient

  Rate of Climb         2,000 to 10,000 Palt
Bi-Camber  Avg.      774 fpm
Elippse      Avg        916 fpm
  The above numbers are an average of several test flights. Higher speeds with fewer RPM and
  a better rate of climb for the Elippse prop.

Gross T.O. Weight for all flights 1,440 lbs.

I am marketing the Elippse propeller (for Paul) for the Experimental aircraft.  If I can be of any further help,
please get back with me.

Thanks for the inquiry and intrest,
Jim Smith