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Date: Wed, 14 Dec 2011 18:46:21 -0600
From: Charlie England <ceengland@bellsouth.net>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: Low idle
References: <list-5305265@logan.com>
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On 12/14/2011 05:53 PM, Thomas Mann wrote:
> I'm posting this response on behalf of John Slade who is using a ISP 
> that is BLACKLISTED (one of many)
> _______________________________________________________________________________________
>
> This is the message:
>
> Tom. Could you ost this to fly rotary for me?
> I know this is a pain, but this one's important....
>
> Chris,
> I have idle set at around 800. Keep in mind that the higher the idle, 
> the harder these canards are to land. Don't listen to the RV guys - 
> they have flaps. Ideally you want the lowest idle you can get, that's 
> not going to stall the engine on final. It's worth a bit of effort to 
> try and tune for a lower idle, but this is the idle with the engine 
> being driven by the prop, which is a different area on the tuning 
> chart to the idle when stationary. You can only tune this area while 
> airborne. I found this out when I first throttled back all the way on 
> a high base, and the engine stumbled. I needed new underwear that day. 
> So - lesson learned - test the throttle all the way back at altitude 
> over the field before doing it on short final.
>
> Be ready to use both rudders to loose altitude if you set the idle 
> high. With the IVO in full fine pitch the thrust won't be too bad, but 
> with a fixed pitch prop idling at 1600 you'd be landing in the next 
> county if you're fast or high on final.
>
> Regards,
> John
Actually, *do* listen to the RV guys, if they have fixed pitch props. 
They will tell you the same thing that John says. :-)

I have no direct experience with EZ types, but any slick, relatively 
high efficiency tractor style a/c with f/p prop will go into neverland 
mode if idle prop rpm (on the ground) is above around 750-800. Anything 
above that, & it will effectively be making thrust instead of drag on final.

Charlie

(lots'o time in RV's)

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    On 12/14/2011 05:53 PM, Thomas Mann wrote:
    <blockquote cite="mid:list-5305265@logan.com" type="cite">I'm
      posting this response on behalf of John Slade who is using a ISP
      that is BLACKLISTED (one of many)
      <div>_______________________________________________________________________________________</div>
      <div><br>
      </div>
      <div>
        This is the message:<br>
        <br>
        Tom. Could you ost this to fly rotary for me?<br>
        I know this is a pain, but this one's important....<br>
        <br>
        Chris,<br>
        I have idle set at around 800. Keep in mind that the higher the
        idle, the harder these canards are to land. Don't listen to the
        RV guys - they have flaps. Ideally you want the lowest idle you
        can get, that's not going to stall the engine on final. It's
        worth a bit of effort to try and tune for a lower idle, but this
        is the idle with the engine being driven by the prop, which is a
        different area on the tuning chart to the idle when stationary.
        You can only tune this area while airborne. I found this out
        when I first throttled back all the way on a high base, and the
        engine stumbled. I needed new underwear that day. So - lesson
        learned - test the throttle all the way back at altitude over
        the field before doing it on short final.<br>
        <br>
        Be ready to use both rudders to loose altitude if you set the
        idle high. With the IVO in full fine pitch the thrust won't be
        too bad, but with a fixed pitch prop idling at 1600 you'd be
        landing in the next county if you're fast or high on final.<br>
        <br>
        Regards,<br>
        John<br>
      </div>
    </blockquote>
    <font size="+1"><font face="Arial">Actually, *do* listen to the RV
        guys, if they have fixed pitch props. They will tell you the
        same thing that John says. :-)<br>
        <br>
        I have no direct experience with EZ types, but any slick,
        relatively high efficiency tractor style a/c with f/p prop will
        go into neverland mode if idle prop rpm (on the ground) is above
        around 750-800. Anything above that, &amp; it will effectively
        be making thrust instead of drag on final.<br>
        <br>
        Charlie<br>
        <br>
        (lots'o time in RV's)<br>
      </font></font>
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