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Ed; If you have issue #79 of the Contact magazine,
it answers many of the questions on the Elippse prop and shows a nice example
carved by Craig Catto. JohnD
----- Original Message -----
Sent: Thursday, December 21, 2006 5:55
PM
Subject: [FlyRotary] Re: Radical Prop Was
C/S
Ed
I had discussions with Paul and he credited me with the
first person to correctly identify his design criteria/ objectives, pretty
simple really however I would hate to design one that works from scratch - I
know absolutely nothing about props.
George ( down under)
All too true, Bill. I had heard
that CATO was in discussion with Paul to build such props, but don't know if
that came together or not. Probably should send Paul an e mail (if I
can find his) and ask him if he things his prop would be effective for a
slower plane line a 200 MPH RV-6A.
Then I would have an idea if it would be worth
while to try. I'd want a 10 MPH increase for it to be worth my while -
heck, I don't fly at top speed in any case, so really wouldn't be much point
for me to get one {:>). Now, if it would add 1000 fpm to rate of
climb then that's a different matter.
Ed
----- Original Message -----
Sent: Wednesday, December 20, 2006
5:16 PM
Subject: [FlyRotary] Re: Radical Prop
Was C/S
Ed,
I have followed Paul Lipps prop design efforts. Very interesting
indeed. There must be some improvement in efficiency since the birds
flying them are usually near or at the front of the pack. Looking for
improvement is admarible Ed, The problem is often you must just build it
yourself. Paul's efforts, at first at least, were the
design program only. He would give you the numbers for the speed and
HP you had and then you had to fabricate the prop yourself! I don't know
if he is supplying a finished product yet or not.
Bill Jepson
-----Original Message-----
From:
eanderson@carolina.rr.com
To: flyrotary@lancaironline.net
Sent: Wed,
20 Dec 2006 10:29 AM
Subject: [FlyRotary] Radical Prop Was C/S
Look under heading BiPlanes in the below URL
and there a pilot reports a 20 mph increase using the radical Lipps
propeller over a more conventional prop - again, my point is better ways
may be more a matter of looking at fresh ideas about props and controllers
rather than accepting what has been.
I believe this prop is optimized for high
speed flight, and while I am certain I don't fully understand the
total reason why, part of the reason it is faster appears to be that it
can develop thrust right down the hub if the airspeed (prop advance?) is
high enough. Also the developer takes issue with the standard
"broad" tips on props. etc.
However, it may not provide the same amount of
increase over my current prop due to the slower airspeeds I flight - but
hey, even 10 MPH increase would be interesting.
FWIW
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