Hmmm,

   IIRC, at one of the prop seminars at this year's Copperstate Fly-in, word was that Craig Catto was building the the Elippse props used in last year's Reno Air Races.
Dunno if he's going to be involved in the production version.  IIARC, Paul Lippse has "retired" (again?) from
developing the design.

Dale R.

> From: keltro@att.net (Kelly Troyer)
> Date: 2005/12/10 Sat AM 10:57:43 EST
> To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
> Subject: [FlyRotary] Elippse Propeller
>
> Guys,
>    Here is an exchange I just had with Paul Lipps the designer of the "Elippse"
> prop blades.........Those of you that have heard about his blades in "Contact"
> mag. and "Sportsman Pilot" mag. may find this info of interest.....FWIW
> --
> Kelly Troyer
> Dyke Delta/13B/RD1C/EC2
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> -------------- Forwarded Message: --------------
> From: keltro@att.net (Kelly Troyer)
> To: "Paul Lipps" Subject: Re: Elippse Propeller
> Date: Sat, 10 Dec 2005 07:54:00 +0000
>
>
>  Paul,
>   Thanks for the info and suggestions......I have e-mailed Grand Aero for info on
> your blades with the numbers for my a/c , engine , etc....
>
> Thanks again,
> --
> Kelly Troyer
> Dyke Delta/13B/RD1C/EC2
>
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>
> -------------- Original message from "Paul Lipps"
>
>
> Hi, Kelly!
>     I don't make props, I only design them. I have designed a prop blade for Grand Aero that will be used in a three-blade, ground-adjustable hub. It's been designed for the RV-series of planes, and will easily accomodate 150hp-200hp for cruise speeds in the 170 mph to 220 mph region. One thing I might caution you about, though. You mention only turning 2100 rpm because of your gear ratio. Takeoff with the prop adjusted for that low a cruise rpm would require a fairly high blade angle. The blades would be stalled over a large portion during the early stages of the takeoff run, and so would not give much initial thrust, making for a longer takeoff. If possible, you might consider a different gear ratio allowing you to set the blades at a lower angle, giving much better static and takeoff thrust. The three-blade prop on my Lancair turns 2230rpm static, 2440rpm in a climb at 115mph IAS, and 2800 rpm at 201 mph cruise at 10,000' dalt. This should give you an idea of the range of rpm you will get with a fixed or ground-adjustable prop. Check out Grand Aero's web site, www.grandaero.com , and if you like what you see, drop a line to John Moyle at john@grandaero.com. If you get Jack Cox's excellent magazine Sportsman Pilot, you can read about all of the race results at Reno, and the two biplanes that came in 1 & 2 with my three-blade design. www.sportsmanpilot.com .   Paul
>