Return-Path: Received: from [65.54.169.62] (HELO hotmail.com) by logan.com (CommuniGate Pro SMTP 4.2b1) with ESMTP id 3144289 for flyrotary@lancaironline.net; Sat, 03 Apr 2004 16:38:58 -0500 Received: from mail pickup service by hotmail.com with Microsoft SMTPSVC; Sat, 3 Apr 2004 13:38:58 -0800 Received: from 4.174.4.203 by bay3-dav32.adinternal.hotmail.com with DAV; Sat, 03 Apr 2004 21:38:57 +0000 X-Originating-IP: [4.174.4.203] X-Originating-Email: [lors01@msn.com] X-Sender: lors01@msn.com From: "Tracy Crook" To: "Rotary motors in aircraft" Subject: Re: [FlyRotary] Percent Power, Throttle position Date: Sat, 3 Apr 2004 16:38:57 -0500 MIME-Version: 1.0 X-Mailer: MSN Explorer 7.02.0011.2700 Content-Type: multipart/alternative; boundary="----=_NextPart_001_0001_01C4199A.28992680" Message-ID: X-OriginalArrivalTime: 03 Apr 2004 21:38:58.0136 (UTC) FILETIME=[121C8580:01C419C4] ------=_NextPart_001_0001_01C4199A.28992680 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable You gave a pretty good list of parameters so I think I can make a pretty = good guess, especially since you used the same TB throat size as I did. = (side note: I think the "bigger is better" approach is the wrong way to= go. There is another rotary advocate recommending a 4 inch or larger TB= ) I'm going from memory here but it seems that at cruise altitude I'm using= about 2/3 travel on throttle quadrant (econo cruise). Down at sea level= this same setting is a lot more power. As you pointed out, there is no= single answer but if the throttle were 40 - 50% open, you could fly most= anywhere safely and comfortably. =20 I'll look at this more closely next time I fly tomorrow. Tracy (Getting very psyched about trying out several mods to the plane) ----- Original Message ----- From: Al Gietzen Sent: Saturday, April 03, 2004 12:07 PM To: Rotary motors in aircraft Subject: [FlyRotary] Percent Power, Throttle position I'm about to make a new throttle plate control arm, and rig the spring fo= r a default position somewhere between full open and full closed in the e= vent of a throttle disconnect. So the speculative question of the day is - what percent power would one = like to maintain in the event of a loss of throttle control, and what but= terfly position would roughly give that power? Of course there is no one answer fits all - different airplane, different= engine, different TB, even different pilot. But let's just guess for a = slippery airplane like a Velocity, with a 265hp NA 20B, and for a TB thro= at dia of about 1-3/4" for each rotor. Too ambiguous? Then I guess I'll have to wait until I fly to figure it o= ut. Al ------=_NextPart_001_0001_01C4199A.28992680 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
You gave a pre= tty good list of parameters so I think I can make a pretty good guess, es= pecially since you used the same TB throat size as I did.  (side not= e:   I think the "bigger is better" approach is the wrong way t= o go.  There is another rotary advocate recommending a 4 inch or lar= ger TB. )
 
I'm going from memory here bu= t it seems that at cruise altitude I'm using about 2/3 travel on throttle= quadrant (econo cruise).  Down at sea level this same setting = is a lot more power.   As you pointed out, there is no sin= gle answer but if the throttle were 40 - 50% open, you could fly most any= where safely and comfortably. 
 
I'll lo= ok at this more closely next time I fly tomorrow.
 
=
Tracy  (Getting very psyched about trying out several mods to = the plane)
 
----- Original Message= -----
From: Al Gietzen
S= ent: Saturday, April 03, 2004 12:07 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Percent Power, Throttle position
 

I'm about to ma= ke a new throttle plate control arm, and rig the spring for a default pos= ition somewhere between full open and full closed in the event of a throt= tle disconnect.

So the speculative question of the day is - what percent power would = one like to maintain in the event of a loss of throttle control, and what= butterfly position would roughly give that power?

 

= Of course there is no one answer fits all= - different airplane, different engine, different TB, even different pil= ot.  But let's just guess for a slippery airplane like a Velocity, w= ith a 265hp NA 20B, and for a TB throat dia of about 1-3/4" for each roto= r.

 

Too ambiguous?=   Then I guess I'll have to wait until I fly to figure it out.

&nb= sp;

Al

<= P class=3DMsoNormal> 

------=_NextPart_001_0001_01C4199A.28992680--