Racing organizations double the displacement for classifying cars with rotary power. So, 2292 CCs for a 12-A and 2606 CCs for a 13-B.

 

Lynn E. Hanover

 

1300cc per rotor.

 

Bobby

 

From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Bill Bradburry
Sent: Wednesday, June 13, 2012 10:56 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: IVO Prop Users...

 

Elsewhere on this same site he claims”

 

You can roughly calculate the VE of an engine if hp is known with:

VE = 5600 X HP divided by (RPM X Displacement in cubic inches)

This would indicate that the rotary, with a VE of 1 would require  a displacement of 160 cu in to get a HP of 180 at 6300 rpm or 200 at 7000 rpm.

 

So what is the deal on the 1300 cc?  that is about 80 cu in.  about half what would be required to produce the HP we hope to get.

 

Bill B

 

---

From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of DLOMHEIM@aol.com
Sent: Tuesday, June 12, 2012 11:53 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] IVO Prop Users...

 

I would highly recommend that any of you running an IVO in-flight adjustable prop to take a few minutes of your time and read Ross's write up on his SDS site...some great information found at:

 

http://www.sdsefi.com/rv13.htm

 

One thing I found interesting for instance was his use of a dedicated AMP meter on his IVO circuit which then allows him to set his pitch based on the amount of amps he is pulling... 

 

Doug Lomheim

RV-9A, 13B / FWF