flyrotary@lancaironline.net Mailing List Archive

I chose the 20B because its actually a little quieter than the 13B, and I can get 300 hp. without a turbo. The Renesis actually makes all its horsepower way up the RPM scale and I didnt want to keep it at red line to make horsepower. Plus, if and apex seal were to break, it usually flys out the peripheral exhaust port. On a Renesis its may continue grinding away untill it goes through a water jacket. just my therory of course.

Bob Mears

-----Original Message-----
From: Andrew Martin <andrew@martinag.com.au>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent: Mon, 1 Oct 2007 12:20 pm
Subject: [FlyRotary] motor decisions!

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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