So we have a data point.
20B FWF w/o prop ~425#
How much does a IO-360 weigh w/o prop, including fluids & radiators?
When
comparing weights for liquid cooled you need to include the coolant and
radiators, because the IO-360 needs neither. In both cases you generally
do not include the oil. My estimates are that the IO-360 on a comparable
FWF basis would be 40# less. But for the same power, you should
compare to 265hp IO-540; which will be more than 425#.
Keeping
the 20B installation down to 425# required custom lightweight induction, exhaust,
oil pan, etc.
Al
How much does a 12b weigh w/o prop, including turbo/supercharger,
fluids & radiators?
Mike LaFleur (dithering between 13b & 20b)
-----
Original Message ----
From: Al Gietzen <ALVentures@cox.net>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent: Tuesday, March 6, 2007 11:58:06 AM
Subject: [FlyRotary] Re: 20b vs. Renesis for Lancair ES?
Al G dynoed his 20B at 295 hp @ 6800 RPM if I remember
correctly. (might have been 285) Al chime in if you see this. The 20B is 50%
bigger. (or 1/3 if you prefer) The engine simply doesn't have to be as highly
stressed to produce power. For the ES GET THE 20B.
You
remember quite correctly; 290 @6800 (sea level, std day, and all that).
More important to me with 2.17 : 1 re-drive, it’s about 265 hp at 6300
(2900 at the prop), and 200 at an easy cruise rpm of 4800. That engine should
go many hours at those conditions. If you want more horses, go with 2.85:1
re-drive.
All
up FWF weight (w/o prop) is about 425# including coolant and radiators.
I
have no first hand experience with the Renesis; but for an ES, I’d go
with the 20B.
Al