X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mail-ww0-f50.google.com ([74.125.82.50] verified) by logan.com (CommuniGate Pro SMTP 5.4.2) with ESMTPS id 5305346 for flyrotary@lancaironline.net; Wed, 14 Dec 2011 20:59:31 -0500 Received-SPF: pass receiver=logan.com; client-ip=74.125.82.50; envelope-from=rwstracy@gmail.com Received: by wgbdr11 with SMTP id dr11so2461356wgb.7 for ; Wed, 14 Dec 2011 17:58:55 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type; bh=Au9TlidPFQrYhITukTe4l5ILbx0IEqv37WsAirta7RE=; b=OjKsuxEyvGPhFvat3g1QhswKkd4je1Jiy7P6st2fz+rrVbAU35IQlDOr44iSvZ4f75 0AP1btl9M1KtDiSQIcevQGpTJBKmeLJTHlTmuv2usxVGce1DejgrqCtAQHp11hF17yWC cFelK/unXsTupLnWJVUOtfdav+m3rFdIN75Lg= MIME-Version: 1.0 Received: by 10.180.14.69 with SMTP id n5mr1737114wic.13.1323914335853; Wed, 14 Dec 2011 17:58:55 -0800 (PST) Received: by 10.216.54.197 with HTTP; Wed, 14 Dec 2011 17:58:55 -0800 (PST) In-Reply-To: References: Date: Wed, 14 Dec 2011 20:58:55 -0500 Message-ID: Subject: Re: [FlyRotary] Re: Low idle From: Tracy To: Rotary motors in aircraft Content-Type: multipart/alternative; boundary=f46d040fa1c6b39b1904b417d3f8 --f46d040fa1c6b39b1904b417d3f8 Content-Type: text/plain; charset=ISO-8859-1 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 True, but remember that a rotary turning at 1600 is only turning the prop at 560 rpm (with a 2.85 : 1 RD-1C drive) Tracy On Wed, Dec 14, 2011 at 7:46 PM, Charlie England wrote: > ** > 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) > --f46d040fa1c6b39b1904b417d3f8 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable 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

True, but remember that a rotary turning at 1600 is = only turning the prop at 560 rpm=A0 (with a 2.85 : 1 RD-1C drive)

Tr= acy


On Wed, Dec 14, 201= 1 at 7:46 PM, Charlie England <ceengland@bellsouth.net> wrote:
=20 =20 =20
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 t= he 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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