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From: <cardmarc@charter.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: center rotor OFF
Date: Tue, 10 May 2005 9:21:42 -0400
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Look at the latest engineering of these engines. Audi does it for one of many. The valves are electronically controlled. Since you cruise at a small % of power, you shut off the power you don't need for accelleration, etc. The cylinders come on as needed automatically. Of course you also could just throw the engine out and get a smaller engine for that part of the trip, which is exactly what lots of hybrids are coming to. 2 engines, one for to and one for cruise!
Marc
> 
> From: "Jack Ford" <jackoford@theofficenet.com>
> Date: 2005/05/09 Mon PM 10:49:42 EDT
> To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
> Subject: [FlyRotary] Re: center rotor OFF
> 
> That entire variable cylinder configuration routine seems to me to be a lot 
> of (old) advertising hype. The concept seems to be that the public thinks 
> fewer cylinders burn less fuel, so you can have your eight cylinder cake and 
> eat four cylinder fuel. Purest balderdash.
> 
> The engine is still pulling eight cylinders worth of rings back and forth in 
> the bores even if it's not compressing any air. The cam is still trying to 
> lift sixteen (plus) valves and compress sixteen (plus) springs, ETC. You 
> can't reduce a lot of the pumping losses if the whole mechanism is still 
> rotating/reciprocating/wearing.
> 
> Power is proportional to the amount of air/fuel mixture going through the 
> pump (assuming the same combustion efficiency). The reduced air/fuel mixture 
> (of the variable cylinder configuration at cruise) presumably produces 
> increased economy. BUT, it requires exactly the same amount of power to push 
> the vehicle down the road at cruise using 4,6,8,10 or 24+ cylinders. The 
> conventional method of accomplishing this enterprise is CLOSING THE THROTTLE 
> so less air/fuel mixture is pumped through. Has the exact same effect with 
> much less complicated design.
> 
> So if you want more efficiency, just run at lower power settings. You will 
> accomplish the desired result.
> 
> Retracting soapbox,
> 
> Jack Ford
> 
> 
> ----- Original Message ----- 
> From: "Ernest Christley" <echristley@nc.rr.com>
> To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
> Sent: Monday, May 09, 2005 3:16 PM
> Subject: [FlyRotary] Re: center rotor OFF
> 
> 
> > Russell Duffy wrote:
> >
> >>  OK, make me look it up :-)  Apparently, they stop the valves from 
> >> opening, rather than leaving them open.  I couldn't find anything that 
> >> gave details of exactly what point in the sequence they stop the valves, 
> >> so the cylinder could either be full of air (silly and wasteful of 
> >> power), empty of air (would cause vacuum that would be as bad as the 
> >> compression force), or perhaps somewhere in between.
> >
> >
> > Other than friction losses, you'll get back everything you put into 
> > compressing the gas in the cylinder, Rusty.  The process will be totally 
> > elastic.
> >
> > -- 
> > This is by far the hardest lesson about freedom. It goes against
> > instinct, and morality, to just sit back and watch people make
> > mistakes. We want to help them, which means control them and their
> > decisions, but in doing so we actually hurt them (and ourselves)."
> >
> >
> >>>  Homepage:  http://www.flyrotary.com/
> >>>  Archive:   http://lancaironline.net/lists/flyrotary/List.html
> >
> > 
> 
> 
> 
> >>  Homepage:  http://www.flyrotary.com/
> >>  Archive:   http://lancaironline.net/lists/flyrotary/List.html
>