Ed Anderson
Joined: 10 Jan 2006
Posts: 475
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 Posted: Tue Sep 22, 2009 5:14 pm Post subject: Rotary BSFC was : Re: Paul Lamar. !!! |
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For the reasons you cited, the rotary BSPC is not as good as a comparable
piston engine. The best I have seen is around 0.5 - 0.55 although some
claims up to 0.47.
However, Mazda has a completely new design rotary (16X) developmental engine
they have shown. The have gone to a narrower rotor housing and doubled the
length of the throw on the eccentric shaft (thereby doubling the torque at
all rpm over the current 13B) and also increased the diameter of the rotor.
They have also changed from the heavy cast iron side housings to aluminum
side housings. The rotor is narrower but larger in diameter all to improve
the BSFC.
The preliminary figures suggest that the block will weigh approx 20-30 lbs
less than the current block with the cast iron side housings and will
produce in the vicinity of 220-230 HP naturally aspire.
If they do come out with in an automobile package before 2012, I intend to
swap out my older 13B with 450 hours and 10 years on it.
The rotary is a very reliable engine, however, the BSFC is never going to
be quite as good as the better piston engines. Fortunately, it has a number
of other attributes that continue to make it the alternative engine of
choice for a growing number.
Just a biased personal opinion of course {:>)
Ed Anderson
Rv-6A N494BW Rotary Powered
Matthews, NC
eanderson(at)carolina.rr.com
http://www.andersonee.com
http://www.dmack.net/mazda/index.html
http://www.flyrotary.com/
http://members.cox.net/rogersda/rotary/configs.htm#N494BW
http://www.rotaryaviation.com/Rotorhead%20Truth.htm
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_________________
Ed Anderson
Rv-6A N494BW Rotary Powered
Matthews, NC
eanderson@carolina.rr.com |
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