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From: "George Lendich" <lendich@optusnet.com.au>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
References: <list-2362389@logan.com>
Subject: Re: [FlyRotary] motor decisions!
Date: Tue, 2 Oct 2007 08:54:05 +1000
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 Andrew,
Are you prepared to mix components?
I would get an old engine 13B and rebuild with new parts.
New Rotor housings Using RX8 rotors with 3mm apex seals, they have the 
higher compression 10:1 rotors.
You won't get much extra hp from the Renesis without the complex induction 
system and it's too big for Aviation use!
I don't like the Renesis (myself) as the side exhausts put too much extra 
heat into the oil.
The RX7 rotor housings are easily P-Ported.
RX7 parts are easy to get in Australia, but Renesis parts are cheaper.

RX7's will give 160 to 180 hp NA without much work, probably more than that 
with side porting, however P-ported will give you more than you will ever 
want. I am trying for 125hp for a single rotor engine.

Have you spoken to any of the Rotary Aviation enthusiasts around Perth?

George ( down under) Brisbane.


> Hi
> I have a 20b and about to start building a plane that is designed for a
> IO 360. It has been suggested to me that I should change to a 2 rotor to
> save weight. I've gone through the archives but didn't really find any
> pro' and con's of 3 or 2 rotors other than the max power available.
> The plane will be used almost exclusively for long X-country cruising
> once the bugs are worked out and hours flown off.
> If my estimated max power required due to VNE is around 200hp, is the
> Renesis always the engine of choice or are there advantages to keeping
> the 20b, accepting the weight penalty and letting the engine loaf along.
> I originally presumed the 20b would be better for me especially when at
> my gross weight of 2420 lbs. but now I am unsure, so to change now
> rather than later would be easier.
> Any help from anyone flying either engine, and points that governed your
> engine of choice would be greatly appreciated.
>
> Regards
> Andrew Martin
> Western Australia
>
>
>
>
>
>
>
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