The 1300cc has something to do with Japans tax structure. Or so the story goes.
Bobby
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Bill Bradburry
Sent: Wednesday, June 13, 2012 1:02 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: IVO Prop Users...
Bobby,
So the only one flying a 13B is Bill Shertz??
The rest of us are flying 26Bs or 39Bs??
Bill B
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Bobby J. Hughes
Sent: Wednesday, June 13, 2012 12:08 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: IVO Prop Users...
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
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:
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...