X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: "Marvin Kaye" To: lml@lancaironline.net Date: Sat, 09 Apr 2005 20:50:41 -0400 Message-ID: X-Original-Return-Path: Received: from imo-m20.mx.aol.com ([64.12.137.1] verified) by logan.com (CommuniGate Pro SMTP 4.3c4) with ESMTP id 863039 for lml@lancaironline.net; Sat, 09 Apr 2005 12:32:20 -0400 Received-SPF: pass receiver=logan.com; client-ip=64.12.137.1; envelope-from=Sky2high@aol.com Received: from Sky2high@aol.com by imo-m20.mx.aol.com (mail_out_v38.7.) id q.1aa.359b68ca (4410) for ; Sat, 9 Apr 2005 12:31:33 -0400 (EDT) From: Sky2high@aol.com X-Original-Message-ID: <1aa.359b68ca.2f895d65@aol.com> X-Original-Date: Sat, 9 Apr 2005 12:31:33 EDT Subject: Re: [LML] Re: Engine Failure X-Original-To: lml@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-----------------------------1113064293" X-Mailer: 9.0 Security Edition for Windows sub 5000 -------------------------------1113064293 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit Strictly confined to LNC2s - 235, 320, 360: Let's see, if there is a failure that causes the engine to stop turning, you will have a stopped prop (if it is still attached). If you are flying with a fixed pitch prop, it is probably best to stop it. If you are flying with a controllable pitch prop and it is still controllable, consider the coarse pitch setting. Data: On a nice fall day in my Lancair 320 @ 1700 pounds and a 70.25 inch Hartzell CS prop. At best glide (about 107 Kts, AOA indication), cruise pitch, zero thrust, the sink rate was 1500-1600 fpm. When the prop was pulled to coarse pitch and 107 KIAS was maintained, the sink rate decreased to 400-500 fpm. I have no data on operation with a stopped prop although it is estimated that the drag is somewhere between the flat pitch and the coarse pitch condition. Consider this: The LNC2s are slicker than snot - a very, very low coefficient of drag (unlike many SEL commercially available spam cans). Because of this, the drag of the dead engine's propeller is a significant performance factor, more significant than airframe drag. All things being equal, upon a non-seized engine failure with a controllable pitch prop (especially on takeoff): 1. Begin to establish best glide speed with one hand. 2. Pull the prop to coarse pitch with the other hand (use your teeth if there is a dual hand deficiency). 3. Do all the other things on your emergency checklist, if you can find it. Scott Krueger AKA Grayhawk Lancair N92EX IO320 SB 89/96 Aurora, IL (KARR) Fair and Balanced Opinions at No Charge! Metaphysical Monologues used at your own Risk. -------------------------------1113064293 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

Strictly confined to LNC2s - 235, 320, 360:

Let's see, if there is a failure that causes the engine to stop turning= ,=20 you will have a stopped prop (if it is still attached).

If you are flying with a fixed pitch prop, it is probably best to stop=20 it.

If you are flying with a controllable pitch prop and it is still=20 controllable, consider the coarse pitch setting.

Data:

On a nice fall day in my Lancair 320 @ 1700 pounds and a 70.25 inch=20 Hartzell CS prop. At best glide (about 107 Kts, AOA indication), cruis= e=20 pitch, zero thrust, the sink rate was 1500-1600 fpm. When the prop was= =20 pulled to coarse pitch and 107 KIAS was maintained, the sink rate decreased=20= to=20 400-500 fpm.

I have no data on operation with a stopped prop although it is estimate= d=20 that the drag is somewhere between the flat pitch and the coarse pitch=20 condition.

Consider this: The LNC2s are slicker than snot - a very, very low= =20 coefficient of drag (unlike many SEL commercially available spam cans). = ;=20 Because of this, the drag of the dead engine's propeller is a significa= nt=20 performance factor, more significant than airframe drag.

All things being equal, upon a non-seized engine failure with a=20 controllable pitch prop (especially on takeoff):

1. Begin to establish best glide speed with one hand.

2. Pull the prop to coarse pitch with the other hand (use your teeth if= =20 there is a dual hand deficiency).

3. Do all the other things on your emergency checklist, if you can find= it.=20

Scott Krueger=20 AKA Grayhawk
Lancair N92EX IO320 SB 89/96
Aurora, IL (KARR)

Fai= r=20 and Balanced Opinions at No Charge!
Metaphysical Monologues used at your=20= own=20 Risk.

-------------------------------1113064293--