Return-Path: Received: from [24.25.9.100] (HELO ms-smtp-01-eri0.southeast.rr.com) by logan.com (CommuniGate Pro SMTP 4.2.5) with ESMTP id 565453 for flyrotary@lancaironline.net; Mon, 13 Dec 2004 10:47:55 -0500 Received-SPF: none receiver=logan.com; client-ip=24.25.9.100; envelope-from=eanderson@carolina.rr.com Received: from edward2 (cpe-069-132-109-019.carolina.rr.com [69.132.109.19]) by ms-smtp-01-eri0.southeast.rr.com (8.12.10/8.12.7) with SMTP id iBDFlZKk008815 for ; Mon, 13 Dec 2004 10:47:37 -0500 (EST) Message-ID: <003a01c4e12b$16cc7d40$2502a8c0@edward2> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Glide distances Date: Mon, 13 Dec 2004 10:47:45 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0037_01C4E101.2DBACBD0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1106 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 X-Virus-Scanned: Symantec AntiVirus Scan Engine This is a multi-part message in MIME format. ------=_NextPart_000_0037_01C4E101.2DBACBD0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable On my 12 mile engine out glide, I punched up the NRST button on my GPS = to find the two closest airfields were both 12 miles away (gulp!). = Since I knew I was going to be gliding around 85 mph that any sort of = headwind would considerably shorten the glide. Fortunately I had been = paying attention to the wind direction as I was outrunning a cold front, = so turned 120 degs for the downwind field. From 9500 MSL I arrived over the selected airfield with approx = 1500-2000 ft AGL. I had altitude to do a 360 and a couple of hard "S" = turns to loose altitude and even then came over the fence at 100 mph. = This with a stubby wing RV-6A. I did have time in that 8 minute glide to find out that my best glide = speed (at that weight) was 87 MPH which produced a 750 fpm rate of = descent. Any slower the rate went up and any faster the rate went up. = Also were I found what airspeeds the prop would stop at as well as what = it took to get it going again. So a rather productive 8 minutes all = things considered {:>). Ed Anderson ----- Original Message -----=20 From: Perry Mick=20 To: Rotary motors in aircraft=20 Sent: Monday, December 13, 2004 9:29 AM Subject: [FlyRotary] Re: Glide distances That's true, if you are flying cross country, and are halfway between = two airports, you would want to pick the one that's downwind, not = necessarily the closest field. I figure with 1nm per 1000' of altitude, just orbiting the field on a = test flight, there is plenty of margin built in since I can supposedly = glide about 1.65 nm / 1000' with no wind. Tom wrote: Perry, There always something. Gotta remember winds. Being downwind of the = airport at the distance limit would be a problem. By the way, when flying skydivers I figured out a very easy way to = determine winds aloft with a GPS. Fly a circle keeping your airspeed constant. = Your GPS groundspeed will be highest when heading downwind and lowest when = heading upwind. Do the simple math on speeds to determine how much. I'm not suggesting you do this during engine-out, just when you're curious and = have a desire to fly in circles.=20 Tom --- Perry Mick wrote: I've never tested engine out glide, but I also plan with 1000 ft/min.=20 And if you assume a 10:1 glide ratio, you can glide 10,000 fpm, or 1.65=20 nm or 1.9 sm per 1000 ft. of altitude. When I do test flights, I try to=20 stay within 1 nm of the airport for each 1000 ft of AGL. For example,=20 5000 ft AGL, stay within a 5 nm radius. Easy with GPS. =20 =09 __________________________________=20 Do you Yahoo!?=20 The all-new My Yahoo! - What will yours do? http://my.yahoo.com=20 Homepage: http://www.flyrotary.com/ Archive: http://lancaironline.net/lists/flyrotary/List.html =20 =20 ------=_NextPart_000_0037_01C4E101.2DBACBD0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
On my 12 mile engine out glide, I = punched up the=20 NRST button on my GPS to find the two closest airfields were both 12 = miles away=20 (gulp!).  Since I knew I was going to be gliding around 85 mph that = any=20 sort of headwind would considerably shorten the glide.  Fortunately = I had=20 been paying attention to the wind direction as I was outrunning a cold = front, so=20 turned 120 degs for the downwind field.
 
  From 9500 MSL I arrived over the = selected=20 airfield with approx 1500-2000 ft AGL.  I had altitude to do a 360 = and a=20 couple of hard "S" turns to loose altitude and even then came over the = fence at=20 100 mph.  This with a stubby wing RV-6A.
 
I did have time in that 8 minute glide = to find out=20 that my best glide speed (at that weight)  was 87 MPH which = produced a 750=20 fpm rate of descent.  Any slower the rate went up and any faster = the rate=20 went up.  Also were I found what airspeeds the prop would stop at = as well=20 as what it took to get it going again.  So a rather productive 8 = minutes=20 all things considered {:>).
 
Ed Anderson
----- Original Message -----
From:=20 Perry = Mick=20
Sent: Monday, December 13, 2004 = 9:29=20 AM
Subject: [FlyRotary] Re: Glide=20 distances

That's true, if you are flying cross country, and are = halfway=20 between two airports, you would want to pick the one that's downwind, = not=20 necessarily the closest field.
I figure with 1nm per 1000' of = altitude,=20 just orbiting the field on a test flight, there is plenty of margin = built in=20 since I can supposedly glide about 1.65 nm / 1000' with no = wind.

Tom=20 wrote:
Perry,
There always something.  Gotta remember winds.  Being downwind of the =
airport
at the distance limit would be a problem.

By the way, when flying skydivers I figured out a very easy way to =
determine
winds aloft with a GPS.  Fly a circle keeping your airspeed constant.  =
Your GPS
groundspeed will be highest when heading downwind and lowest when =
heading
upwind.  Do the simple math on speeds to determine how much.  I'm not
suggesting you do this during engine-out, just when you're curious and =
have a
desire to fly in circles.=20

Tom

--- Perry Mick <pjmick@viclink.com> wrote:
  
I've never tested engine =
out glide, but I also plan with 1000 ft/min.=20
And if you assume a 10:1 glide ratio, you can glide 10,000 fpm, or 1.65=20
nm or 1.9 sm per 1000 ft. of altitude. When I do test flights, I try to=20
stay within 1 nm of the airport for each 1000 ft of AGL. For example,=20
5000 ft AGL, stay within a 5 nm radius. Easy with GPS.

    



	=09
__________________________________=20
Do you Yahoo!?=20
The all-new My Yahoo! - What will yours do?
http://my.yahoo.com=20

  
 Homepage:  http://www.flyrotary.com/
 Archive:   http://lancai=
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