X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Wed, 23 Apr 2014 12:17:33 -0400 Message-ID: X-Original-Return-Path: Received: from vipmail.volcano.net ([208.3.194.23] verified) by logan.com (CommuniGate Pro SMTP 6.0.9e) with ESMTPS id 6843072 for lml@lancaironline.net; Tue, 22 Apr 2014 20:09:10 -0400 Received-SPF: pass receiver=logan.com; client-ip=208.3.194.23; envelope-from=pinetownd@volcano.net Received: from [65.165.165.211] (helo=DennisPC) by vipmail.volcano.net with esmtpa (Exim 4.80.1) (envelope-from ) id 1Wckjq-0002RN-UY for lml@lancaironline.net; Tue, 22 Apr 2014 17:08:36 -0700 X-Original-Message-ID: <652AD382720E449CADC04392D794E800@DennisPC> From: "Dennis Johnson" X-Original-To: "Lancair Mailing List" References: In-Reply-To: Subject: Re: [LML] Re: Hartzell Prop Governor Low RPM Capability X-Original-Date: Tue, 22 Apr 2014 17:09:18 -0700 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_475C_01CF5E4D.9885EC00" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Windows Mail 6.0.6002.18197 X-MimeOLE: Produced By Microsoft MimeOLE V6.0.6002.18463 This is a multi-part message in MIME format. ------=_NextPart_000_475C_01CF5E4D.9885EC00 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hi Valin, I'm not sure why you're concerned about the extra drag from the main = landing gear doors. When I practice simulated engine out landings, I = don't lower the gear until it's clear that I'm going to land too long if = I don't do something to slow down. If I had a real engine failure and = wasn't going to make it to a runway, I'd probably leave the gear up.=20 Regarding the need to cycle the dump valve to get the landing gear up or = down, in 700 hours in my Legacy, I've never had a problem that required = opening the dump valve. My guess is that it's a rare condition, = possibly limited to a small number of Legacies, most likely due to a = problem with the hydraulic power pack. Based on my experience, I = wouldn't add more time, money, and parts count to solve a problem that's = unlikely and, if it does occur, has a simple immediate fix.=20 Best, Dennis =20 ----- Original Message -----=20 From: Thorn, Valin B. (JSC-VA411)=20 To: lml@lancaironline.net=20 Sent: Tuesday, April 22, 2014 12:03 PM Subject: [LML] Re: Hartzell Prop Governor Low RPM Capability Thanks John. Makes it clear why one of the Legacy instructors was = quoted as saying, "With the engine out, the Legacy comes down like a = greased Buick" - I guess specifically talking about with the gear down. = =20 We have Adam Molny's closing inboard landing gear door system which = should help with the gear down drag a lot. Adam, if you see this, do = you have engine off sink rate numbers with your gear down and inboard = doors closed you can share for comparison? =20 Thanks, =20 Valin Thorn Legacy Project Boulder, Colorado =20 =20 ------=_NextPart_000_475C_01CF5E4D.9885EC00 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Hi Valin,
 
I'm not sure why you're concerned about the extra drag from the = main=20 landing gear doors.  When I practice simulated engine out landings, = I don't=20 lower the gear until it's clear that I'm going to land too long if I = don't do=20 something to slow down.  If I had a real engine failure and wasn't = going to=20 make it to a runway, I'd probably leave the gear up. 
 
Regarding the need to cycle the dump valve to get the landing gear = up or=20 down, in 700 hours in my Legacy, I've never had a problem that required = opening=20 the dump valve.  My guess is that it's a rare condition, possibly = limited=20 to a small number of Legacies, most likely due to a problem with = the=20 hydraulic power pack.  Based on my experience, I wouldn't add more = time,=20 money, and parts count to solve a problem that's unlikely and, if it=20 does occur, has a simple immediate fix. 
 
Best,
Dennis 
----- Original Message -----
From:=20 Thorn,=20 Valin B. (JSC-VA411)
Sent: Tuesday, April 22, 2014 = 12:03=20 PM
Subject: [LML] Re: Hartzell = Prop Governor=20 Low RPM Capability

Thanks=20 John.  Makes it clear why one of the Legacy instructors was = quoted as=20 saying, =93With the engine out, the Legacy comes down like a greased = Buick=94 =96 I=20 guess specifically talking about with the gear down.=20  

 

We=20 have Adam Molny=92s closing inboard landing gear door system which = should help=20 with the gear down drag a lot.  Adam, if you see this, do you = have engine=20 off sink rate numbers with your gear down and inboard doors closed you = can=20 share for comparison?

 

Thanks,

 

Valin=20 Thorn

Legacy=20 Project

Boulder,=20 Colorado

 

 

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