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Two points:
1. if the aircraft was
designed for the IO-360, then the 13B is a good choice. If the aircraft is
designed for the 6 cyl. Lyc or TCM, the the 20B is the best choice.
2. Don't forget the
weight and balance. the 360 and 13B come in about the same weight, so not much
of a problem. The 20B comes in at a lower weight then the 6 cyl, so you are
faced with a small weight and balance problem. If you try to use the 13B in
place of the 6 cyl, you really have a big weight and balance problem. Remember
the weights shown on the Lyc and TCM sites do not always include all the
accessories. The weight you get on the www.Mistral-Engines.com site includes
almost everything.
Giff Marr
LIV-P/Mistral
65%
Mike, a couple of points, first: if you are even considering a IO-360 you
are building an older ES not the newer super ES correct? I mention this since
the Super uses a 540 Continental 6 cylinder. Second: The Conti 6 or a lyc O or
IO 540
weigh around 500# ready to operate. Those numbers are from the Lycoming web site
and may be a bit optimistic. I would say at LEAST 500# for a 6 cylinder. So the
20B is still 50-90# lighter! The IO 360 weighs between 400-450# depending on
configuration. A clean 13B setup and a IO-360 FWF are about equal in
weight.
Bill Jepson
-----Original Message-----
From:
ALVentures@cox.net
To: flyrotary@lancaironline.net
Sent: Wed, 7 Mar 2007
7:45 AM
Subject: [FlyRotary] Re: 20b vs. Renesis for Lancair ES?
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)
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
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