X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Sun, 29 Jun 2008 21:18:15 -0400 Message-ID: X-Original-Return-Path: Received: from web36905.mail.mud.yahoo.com ([209.191.85.73] verified) by logan.com (CommuniGate Pro SMTP 5.2.4) with SMTP id 2996680 for lml@lancaironline.net; Sun, 29 Jun 2008 12:15:58 -0400 Received: (qmail 26780 invoked by uid 60001); 29 Jun 2008 16:15:59 -0000 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.com; h=Received:X-Mailer:Date:From:Subject:To:MIME-Version:Content-Type:Message-ID; b=ZRMbrzze/VfTbnLrObTNwxzMVUklQgZNGNjOhDkt4EVruegagnejtbL5lkUi4LubPb14t3UKgN5l6kmRJ4N/8YnE8pboQ5EsjE9aZYKEuMoUBHeoYnEsmQDdQAeUd0pEDSh9aoWM0vVyGoDlmd3OvS48OSdGl3s+LzCPcOxlVMs=; Received: from [99.147.110.214] by web36905.mail.mud.yahoo.com via HTTP; Sun, 29 Jun 2008 09:15:59 PDT X-Mailer: YahooMailRC/975.45 YahooMailWebService/0.7.199 X-Original-Date: Sun, 29 Jun 2008 09:15:59 -0700 (PDT) From: Chris Zavatson Subject: Re: [LML] Re: Reply to parts needed X-Original-To: Lancair Mailing List MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="0-1136770108-1214756159=:25663" X-Original-Message-ID: <605495.25663.qm@web36905.mail.mud.yahoo.com> --0-1136770108-1214756159=:25663 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable <>=0A=0A=A0=0ALower i= s better.=A0 Testing the free fall at higher speeds will tell you the healt= h of your gas strut (and how much friction you have in your system).=A0 The= most severe test is to free fall at too high=A0an air=A0speed, say 120, an= d then slowly decrease speed until the nose gear locks.=A0 This way gravity= and momentum cannot aid in locking the gear.=A0 It is all up to the gas st= rut.=A0 In a real emergency when you only get one chance, you would want to= slow down as much as possible to let gravity assist in locking the nose ge= ar.=A0 The air load on the nose strut is a fcn of vel^2, so there is a big = difference between 100, 90, and 80 knots. =A0=0AIf the system has too much = friction due to binding etc., free fall in flight may not even be possible.= =A0 The stock set-up will lock the nose strut at more than 100 kts.=0A=0A= =0A=A0=0A=A0=0AChris Zavatson=0AN91CZ=0A360std=0Awww.N91CZ.com=0A=0A=0A = --0-1136770108-1214756159=:25663 Content-Type: text/html; charset=us-ascii

<<For my own clarification, I was trained that the airspeed should be as slow as
possible when you go through the manual gear down and locked procedure. In
fact I've got a line in my check list that indicates 87 knots when going
through the manual procedure.

I don't remember which Lancair you have. Mine is a LNC2 360. Perhaps the 120
knot speed is for a different model Lancair. What are other's thoughts?>>

Lower is better. Testing the free fall at higher speeds will tell you the health of your gas strut (and how much friction you have in your system). The most severe test is to free fall at too high an air speed, say 120, and then slowly decrease speed until the nose gear locks. This way gravity and momentum cannot aid in locking the gear. It is all up to the gas strut. In a real emergency when you only get one chance, you would want to slow down as much as possible to let gravity assist in locking the nose gear. The air load on the nose strut is a fcn of vel^2, so there is a big difference between 100, 90, and 80 knots.

If the system has too much friction due to binding etc., free fall in flight may not even be possible. The stock set-up will lock the nose strut at more than 100 kts.

Chris Zavatson

N91CZ

360std

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