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gcrowder2
Joined: 09 Jan 2006
Posts: 136
Location: Golden, Colorado USA
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 Posted: Wed Oct 15, 2008 8:19 am Post subject: Bicamber prop technology and Paul Lipps |
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Here's some interesting propeller developments from a company called Bicamber Technology. They claim to have a new airfoil design thats much
more efficient C using a concave section behind the maximum camber point
on both sides of the blade.
http://www.bicambertechnology.com/
But in a recent test between a two blade Bicamber shaped foil and the Paul Lipps designed 3 blade Ellipse C the Lipps prop proved significantly more efficient. Reposted from the Rotary Eng list:
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
Marc Joseph
Hi Marc C
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 C000 Palt and 10 C000 Palt for
both props.
4 C000 Palt RPM IAS(mph) TAS(mph)
Effective pitch
Bi-Camber 2 C778 170.8
183.5 69.7"
Elippse 2 C740 180.8
193 74.4 " 18% more efficient
10 C000 Palt
Bi-Camber 2 C695 149
177.5 69.5"
Elippse
2 C655 157.6 184.4 73.3" 14%
more efficient
Rate of Climb 2 C000 to 10 C000 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 C440 lbs.
I am marketing the Elippse propeller (for Paul) for the Experimental
aircraft. If I can be of any further help C
please get back with me.
Thanks for the inquiry and intrest C
Jim Smith
See how Windows connects the people C information C and fun that are part of your life. See Now [quote][b]
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DannyBo
Guest
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| Posted: Fri Apr 09, 2021 3:06 am Post subject: Re: Bicamber prop technology and Paul Lipps |
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