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Thought some of you might be interested in Paul Lipps
response to my e mail concerning his plans for his unique propeller. I
sent him another e mail asking whether the CS was going to be
hydraulic or electric control of pitch.
Ed
----- Original Message -----
Sent: Tuesday, December 26, 2006 9:23 PM
Subject: Re: Prop Suitability
Hi, Ed!
I'm working with a prop builder, and we're
going to bring out a three-blade CS prop of my design specifically for the
RV-series with 150-200+ hp, 150 -240 mph TAS. 'Course, there's a long way
to go to get a design, then make and test some to be sure that it is flaw
free. When this takes place, there will be lots of publicity so everyone
will know about it. My fixed-pitch three-blade has reduced static thrust
since there is so little area outboard, and yet my little Lancair, with a
125 HP O-235, climbs at about 1500 ft/sec at 1350 lb, 110 mph IAS, sea level. I
estimate the prop's efficiency at 82% in a climb.
'Wish I could give
you something firmer. 'Still no website! Thanks for your
inquiry! Paul
----- Original Message -----
----- Original Message -----
Sent: Wednesday, December 20, 2006 6:44
PM
Subject: Prop Suitability
Hello Paul,
I have read with great interest (who has not?) the
literature on the effectiveness of your elliptical propeller.
Just two quick questions, would such a propeller be
suitable for aircraft flying between 160-200 MPH or do you
need a faster aircraft to gain the maximum benefit? ( I
have a Mazda Rotary powered RV-6A).
Second question. Would the propeller be more/less
effective than the typical fixed pitch wood prop in the take off and climb
regime? In otherwords, does it have meaningful benefits at less that
full boogie airspeed.
I realize there are dozens of parameters that would
probably need to be defined for any quantitative assessment - but, just a
"seat of the pants" assessment is fine.
By the way, do you have a website?
Thanks and Happy Holidays
Ed
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