X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Wed, 19 Dec 2007 10:50:13 -0500 Message-ID: X-Original-Return-Path: Received: from smtpclma02.spirittelecom.com ([165.166.142.53] verified) by logan.com (CommuniGate Pro SMTP 5.2c1) with ESMTPS id 2605091 for lml@lancaironline.net; Wed, 19 Dec 2007 07:49:29 -0500 Received-SPF: pass receiver=logan.com; client-ip=165.166.142.53; envelope-from=tkhall@highland.net X-Report-Abuse-To: abuse@spirittelecom.com Received: from DF3GW931 (dial-83.r3.sclors.infoave.net [207.144.176.213]) by smtpclma02.spirittelecom.com (8.13.6/8.13.1) with ESMTP id lBJCmgs0012723 for ; Wed, 19 Dec 2007 12:48:47 GMT X-Original-Message-Id: <200712191248.lBJCmgs0012723@smtpclma02.spirittelecom.com> From: "Tom Hall" X-Original-To: "'Lancair Mailing List'" Subject: RE: [LML] Re: Skoppe lancair 4 pt X-Original-Date: Wed, 19 Dec 2007 07:48:46 -0500 MIME-Version: 1.0 Content-Type: multipart/related; boundary="----=_NextPart_000_0145_01C84213.9619E370" X-Mailer: Microsoft Office Outlook, Build 11.0.6353 Thread-Index: AchCCOwzjMpzH5x/RlaRzfI2KDrn1AAMo3QQ In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3198 X-Virus-Scanned: ClamAV 0.88.4/5177/Wed Dec 19 07:03:02 2007 on smtpclma02.spirittelecom.com X-Virus-Status: Clean This is a multi-part message in MIME format. ------=_NextPart_000_0145_01C84213.9619E370 Content-Type: multipart/alternative; boundary="----=_NextPart_001_0146_01C84213.9619E370" ------=_NextPart_001_0146_01C84213.9619E370 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit In addition, assuming that most are using TruTrak APs, the autopilot itself is ,essentially, a self contained system that will continue to fly the aircraft without input from the any of the other AHARS systems. STEC are also independent. Yes, a total electrical failure of an isolated dual electrical system could render if non-functional, but that would also "kill" electric DG, AI, HIS, etc. SO, are we going to put in a vacuum system to back up a dual electrical system. Naturally, they are notoriously prone to failure. Regarding the premise of lightning, I might suggest that if we are disabled by a strike in hard IFR conditions, then we have already made a couple of other serious misjudgments? If anyone out there has the illusion that flying can be made completely fool-proof, you might need to rethink your involvement in aviation. Remember, fools are so dang ingenious! IVPT 725PT _____ I've stopped 1,745 spam and fraud messages. You can too! Free trial of spam and fraud protection at www.cloudmark.com Cloudmark Desktop - Join the fight against spam! _____ From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of PTACKABURY@aol.com Sent: Wednesday, December 19, 2007 1:32 AM To: lml@lancaironline.net Subject: [LML] Re: Skoppe lancair 4 pt In a message dated 12/18/2007 3:11:34 P.M. Pacific Standard Time, VTAILJEFF@aol.com writes: Do you not consider a second independent EFIS with it's own ADAHRS as sufficient backup Not a simple question--depends on the power distribution design concept. My first reaction is to suggest you consider the common elements between the two EFISs--and that would seem to be only the pitot static system since the Dynon has its own separate battery. When I designed my electrical system I started with an all electric objective and did all I could to include simplicity as well as redundancy to keep the motor running. For a number of reasons that resulted in two Odyssey batteries and one alternator. Then I added a Chelton Pro--a certified EFIS. So I felt comfy I had a good AHARS and two high quality displays with redundancy. To provide a backup for the 2% of the time I am in real IFR I decided a Dynon was the cost effective answer--I just could not imagine a failure mode that would leave the motor running and kill both EFISs. But maybe your imagine is different than mine. paul--LIV N94PT _____ See AOL's top rated recipes and easy ways to stay in shape for winter. ------=_NextPart_001_0146_01C84213.9619E370 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

In addition, assuming that most are = using TruTrak APs, the = autopilot itself is ,essentially, a self contained system that = will continue to fly the aircraft without input from the any of the other AHARS = systems. STEC are also independent. Yes, a total electrical failure of an isolated = dual electrical system could render if non-functional, but that would also = “kill” electric DG, AI, HIS, etc. SO, are we going to put in a vacuum system to = back up a dual electrical system. Naturally, they = are notoriously prone to failure.

 

Regarding the premise of lightning, = I might suggest that if we are disabled by a strike in hard IFR = conditions, then we have already made a couple of other serious misjudgments? If anyone = out there has the illusion that flying can be made completely fool-proof, = you might need to rethink your involvement in aviation. Remember, fools are so = dang ingenious!

 

IVPT 725PT =

 

I've stopped = 1,745 spam and fraud = messages. You can too!
Free trial of spam and fraud protection at www.cloudmark.com<= br> 3D"Cloudmark

From: = Lancair Mailing List = [mailto:lml@lancaironline.net] On Behalf Of = PTACKABURY@aol.com
Sent: Wednesday, December = 19, 2007 1:32 AM
To: = lml@lancaironline.net
Subject: [LML] Re: Skoppe = lancair 4 pt

 

In a message dated 12/18/2007 = 3:11:34 P.M. Pacific Standard Time, VTAILJEFF@aol.com = writes:

Do you not consider a second = independent EFIS with it’s own ADAHRS as sufficient backup

Not a simple question--depends on = the power distribution design concept.  My first reaction is to suggest = you consider the common elements between the two EFISs--and that would seem = to be only the pitot static system since the Dynon has its own separate battery.  When I designed my electrical system I started with an = all electric objective and did all I could to include simplicity as well as = redundancy to keep the motor running.  For a number of reasons that resulted in = two Odyssey batteries and one alternator.  Then I added a Chelton = Pro--a certified EFIS.  So I felt comfy I had a good AHARS and two high = quality displays with redundancy.  To provide a backup for the 2% of the = time I am in real IFR I decided a Dynon was the cost effective answer--I just = could not imagine a failure mode that would leave the motor running and kill both EFISs.  But maybe your imagine is different than = mine.

paul--LIV = N94PT



See AOL's top rated recipes and easy ways to stay in shape for winter.

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