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I understand your points and concern, George. But, just think about what
folks must have thought when the first rotary engine came out {:>). I agree
with Ernest, the technology has come a long ways on ways to protect the
aluminum housings.
I think most of the HP increase is as Ernest points out from combustion
volume increase (and a bit from less cooling of the combustion by the walls)
so more heat to push the rotor. So I don't expect anything as exotic as the
current Renesis engine in the intake department - they simply don't need it
and the complexity and the cost it entails. But, of course, this all
remains to be seen.
I'll take the chance on being one of the early ones to try the 16B - getting
a bit tired of the 13B and haven't done anything to the aircraft in over a
year - its just starts up and takes me where I want to go. I guess the
honeymoon is over {:>)
Still don't have any good feel on how soon we might see this engine - I
doubt it will be in the 2009 model year (probably out now). I hope to heck
that FORD doesn't try to kill it which is a constant concern.
Ah, well - back to programming.
Ed Anderson
Rv-6A N494BW Rotary Powered
Matthews, NC
eanderson@carolina.rr.com
http://www.andersonee.com
http://members.cox.net/rogersda/rotary/configs.htm#N494BW
http://www.dmack.net/mazda/index.html
-----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On
Behalf Of Ernest Christley
Sent: Friday, September 05, 2008 6:51 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: New rotary engine-mazda points on design
George Lendich wrote:
> Ed,
> I was wondering about all that and hope any gains aren't negated by
> the removal of some highly tuned and complicated intake manifold, that
> won't fit into a cowl- like the Renesis manifold.
>
The gains are coming from increased volume. When it comes to power,
there is NO substitute for volume. We may not be able to get rated
power with an unoptimized, NA intake, but we WILL get more power.
> There is also the concern of how good the surface treatment of the
> aluminium side housing are going to be. I guess only time will tell. I
> hate the first release of anything like this, it invariably has problems.
>
That is a valid concern, but ceramic surface coatings have come a LONG
way in the past 20 years and are well understood by the people that need
to understand them. There isn't anything really cutting edge about what
they're doing. I plan to treat the engine I'm almost ready to start as
a 500hr engine. I'd treat the 16B the same way, just because they're so
cheap to replace.
> Then there's the complexity of injection and the very high pressure of
> direct injection, as well as the associated hardware and much needed
> software to make it all work.
From the animations, the injection timing will have the injectors
blowing fuel into a chamber that is below atmospheric, unless there is a
turbo pumping up the working chamber. Remember, the rotor is pulling
air into the chamber so you'll have less than 100% VE. Neither the
hardware nor the software are anything new. The only thing different is
when the software tells the hardware to blow fuel. Just a little
tweaking of some software parameters. No new territory is being
discovered. Again, nothing cutting edge.
--
http://www.ernest.isa-geek.org
--
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