X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Mon, 06 Jan 2014 14:46:23 -0500 Message-ID: X-Original-Return-Path: Received: from argon.lunarpages.com ([216.97.227.30] verified) by logan.com (CommuniGate Pro SMTP 6.0.8) with ESMTPS id 6670994 for lml@lancaironline.net; Mon, 06 Jan 2014 14:45:22 -0500 Received-SPF: pass receiver=logan.com; client-ip=216.97.227.30; envelope-from=thorn@starflight.aero Received: from 71-218-218-7.hlrn.qwest.net ([71.218.218.7]:52870 helo=VAlien2) by argon.lunarpages.com with esmtpa (Exim 4.77) (envelope-from ) id 1W0G6N-0005WX-Sj for lml@lancaironline.net; Mon, 06 Jan 2014 11:44:44 -0800 From: "Valin & Allyson Thorn" X-Original-To: "'Lancair Mailing List'" X-Original-Cc: "Valin & Allyson Thorn" References: In-Reply-To: Subject: RE: [LML] Legacy Takeoff Performance at High Elevation Airports? X-Original-Date: Mon, 6 Jan 2014 12:44:38 -0700 X-Original-Message-ID: <005801cf0b17$bcad2190$360764b0$@starflight.aero> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0059_01CF0ADD.105156D0" X-Mailer: Microsoft Outlook 15.0 Thread-Index: AQJF0U6P7eds4M73bLid0RrUG0EWF5mKiVxQ Content-Language: en-us X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - argon.lunarpages.com X-AntiAbuse: Original Domain - lancaironline.net X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - starflight.aero X-Get-Message-Sender-Via: argon.lunarpages.com: authenticated_id: thorn@starflight.aero This is a multipart message in MIME format. ------=_NextPart_000_0059_01CF0ADD.105156D0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit A big thanks to everyone on and off the list for their feedback on these questions. It's very helpful. We'll see how she performs before moving out on turbo charging. Glad we made our AC removable. Always remember Gail Jensen, her and Art live in Colorado, saying their Legacy, "Flies like a homesick angel!" So figured it can't be too much of a dog at altitude. :) Valin Thorn From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of Valin & Allyson Thorn Sent: Thursday, January 02, 2014 8:19 AM To: lml@lancaironline.net Subject: [LML] Legacy Takeoff Performance at High Elevation Airports? Hey LML gang, With an eye toward practicing instrument approaches, I downloaded the RealAir Lancair Legacy airplane model for Flight Simulator X. I'll send a separate LML post asking about its accuracy to focus that particular discussion. I was impressed, though, with its apparent flight performance fidelity in general. With our Legacy still under construction, it was interesting to fly the simulated Legacy out of our new airport base in Colorado at the Rocky Mountain Metro Airport (KBJC) near Boulder (former Jeffco) with a field elevation of about 5673 ft MSL. Fortunately the longest runway is about 9000 ft long. Even with that, if the Legacy sim model is fairly accurate, it has me concerned about takeoff performance especially during summers with density altitudes as high as around 9000 ft. With a naturally aspirated engine we'll be looking at only about 24" of manifold pressure at full throttle and the thinner air for the prop and wings... So my question is, what kind of takeoff performance are Legacy pilots seeing at high elevation airports - take off rollout, climb rates, etc.? This has us thinking about at least turbo-normalizing our IO-550 engine. For those with turbo-chargers, what kind of improvement in performance are you seeing at high elevation airports? Also, how are pilots adjusting their takeoff technique at high elevations. In comparing the sim Legacy at sea level and in Colorado, and being on the back side of the power curve below about 120 kts, it helps to delay take off rotation speed at high elevation in the sim. Real world.? Thanks, Valin Thorn Legacy Project Boulder, Colorado ------=_NextPart_000_0059_01CF0ADD.105156D0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

A big thanks to everyone on and off the list for = their feedback on these questions.  It’s very helpful.  We’ll see how she = performs before moving out on turbo charging.  Glad we made our AC = removable…  =

 

Always remember Gail Jensen, her and Art live in = Colorado, saying their Legacy, “Flies like a homesick = angel!”  So figured = it can’t be too much of a dog at altitude… J<= /span>

 

Valin Thorn

 

 

From: Lancair Mailing List [mailto:lml@lancaironline.net] On = Behalf Of Valin & Allyson Thorn
Sent: Thursday, = January 02, 2014 8:19 AM
To: = lml@lancaironline.net
Subject: [LML] Legacy Takeoff = Performance at High Elevation = Airports?

 

Hey LML = gang,

 

With an eye toward practicing = instrument approaches, I downloaded the RealAir Lancair Legacy airplane = model for Flight Simulator X.  = I’ll send a separate LML post asking about its accuracy to = focus that particular discussion.  = I was impressed, though, with its apparent flight performance = fidelity in general.

 

With our Legacy still under = construction, it was interesting to fly the simulated Legacy out of our = new airport base in Colorado at the Rocky Mountain Metro Airport (KBJC) = near Boulder (former Jeffco) with a field elevation of about 5673 ft = MSL.  Fortunately the = longest runway is about 9000 ft long.  Even with that, if the Legacy = sim model is fairly accurate, it has me concerned about takeoff = performance especially during summers with density altitudes as high as = around 9000 ft.  With a = naturally aspirated engine we’ll be looking at only about = 24“ of manifold pressure at full throttle and the thinner air for = the prop and wings...

 

So my question is, what kind of = takeoff performance are Legacy pilots seeing at high elevation airports = – take off rollout, climb rates, etc.?  This has us thinking about at = least turbo-normalizing our IO-550 engine…  For those with turbo-chargers, = what kind of improvement in performance are you seeing at high elevation = airports?

 

Also, how are pilots adjusting their = takeoff technique at high elevations.  In comparing the sim Legacy at = sea level and in Colorado, and being on the back side of the power curve = below about 120 kts, it helps to delay take off rotation speed at high = elevation in the sim.  Real = world…?  =

 

Thanks,

 

Valin Thorn

Legacy = Project

Boulder, = Colorado

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