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From: <cardmarc@charter.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: center rotor OFF
Date: Mon, 9 May 2005 9:40:50 -0400
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On a 3 rotor in economy cruise, would it be possible to completely shut off the center rotor fuel injectors and just pump air? I am sure friction losses would not be much, and fuel savings could be high. Many cars do this now by shutting off the valves or some other method. Would the lack of a power pulse unbalance the engine? Would tracy's unit somehow adjust for this lower power output without increasing the flow to the other injectors?
Marc W 
> From: "Russell Duffy" <13brv3@bellsouth.net>
> Date: 2005/05/06 Fri PM 10:13:35 EDT
> To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
> Subject: [FlyRotary] Re: Static MAP readings?
> 
>  I was thinking that I could use two injectors as primaries and the other
> two as secondaries. I believe the secondaries kick in above a certain
> throttle setting?  If set up like that, wouldn't all 4 injectors be working
> at cruise throttle settings?  If so, if one injector failed, there would
> still be one injector spraying fuel into one of the rotor housings, and two
> spraying fuel into the other rotor housing, giving me some kind of
> redundancy.   
>  
>  
> Hi Paul,
>  
> Just got my DSL and phone line back.  I was having withdrawals :-)  
>  
> You're right about what you say, but I don't think that half of your fuel
> will be much better than none.  I'm guessing the rotor would be so lean that
> it wouldn't fire anyway.
>  
> With Tracy's unit, you can install disable switches (and if you're smart you
> will when you're wiring the EC-2 <g>).  When you disable one set of
> injectors, the cpu knows it, and will take the proper action, which is
> really a sweet feature. 
>  
> If your in cruise, and all 4 injectors are running, it will double the fuel
> pulse to the two injectors that you didn't disable.  That way, you will have
> normal fuel flow, up to the point where your two injectors run out of flow.
> This will still get us into the high cruise range, but maybe not WOT at sea
> level.  
>  
> If you're at low throttle, and disable the ones that weren't on anyway,
> nothing happens.  If you're at low throttle and disable the ones that were
> on, it turns the others on instead. 
>  
> Any of that makes sense?
>  
> Rusty (still working on the single rotor Ebay guy)
>  
>  
>  
> 
>