X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Tue, 20 Dec 2011 08:06:53 -0500 Message-ID: X-Original-Return-Path: Received: from carbinge.com ([69.5.27.218] verified) by logan.com (CommuniGate Pro SMTP 5.4.2) with SMTP id 5311610 for lml@lancaironline.net; Tue, 20 Dec 2011 01:31:02 -0500 Received-SPF: none receiver=logan.com; client-ip=69.5.27.218; envelope-from=jbarrett@carbinge.com Received: (qmail 24461 invoked from network); 20 Dec 2011 06:30:27 -0000 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; h=X-Originating-IP:Reply-To:From:To:Subject:Date:Message-ID:MIME-Version:Content-Type:X-Mailer:Thread-Index:Content-Language; s=default; d=carbinge.com; b=JYkR+/cJDGYYU4NbwHeg1n2Ijii63h/h9Y8BNN0VpYgZn6ENnJsWAeEw55MYvDxJUFgTCEAgexYeEJHLTr17mJXqwCl8a4RkyQQYN0Fi8S95r6ZCggF1kWV0oR5IJmp3PrG+Yo0mJm3lqFue1eZonzma8JnPyMjgbpcUYbpNMWE=; X-Originating-IP: [24.143.115.170] Reply-To: From: "John Barrett" X-Original-To: "Lancair Mailing List" Subject: Re: MGL back up instrumentr X-Original-Date: Mon, 19 Dec 2011 22:30:27 -0800 X-Original-Message-ID: <01ae01ccbee0$ddc99870$995cc950$@com> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_01AF_01CCBE9D.CFA65870" X-Mailer: Microsoft Office Outlook 12.0 Thread-Index: Acy+3rQS5+O5/B20RHWm5d9NlJ4m6QAAgVKw Content-Language: en-us This is a multi-part message in MIME format. ------=_NextPart_000_01AF_01CCBE9D.CFA65870 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Terrance, =20 A most unorthodox choice of substitute for altimeter and a/s indicators. = These instruments are primarily there as worst case back up instruments = for saving my ass when everything except the engine fails while in IMC. = No more GPS, PFDS etc. Maybe the G496 will still work off it's battery. = If so that may solve the problem but if not? =20 A purely mechanical AOA might help me to keep from stalling but how = could I rely on it to get me out of IMC safely? =20 John Sent from my iPad =20 On Dec 19, 2011, at 10:45 AM, Terrence O'Neill = wrote: Lurking, might one quietly suggest that the ultimate backup would be a = simple, mechanical AOA vane on the wing? That's all you need to keep from stalling, as you can see the ground. =20 Terrence L235/320 N211AL =20 =20 On Dec 19, 2011, at 9:00 AM, John Barrett wrote: Good question, Jeff. Some more naturally follow: =20 1. Are you stating my backup instruments are unreliable? 2. If so, what do you find unreliable about them? 3. Assuming they are unreliable, what would you replace them with? =20 I guess the real question is what instrument that gives airspeed or = altitude will never fail to provide needed information under any = circumstance? =20 =20 From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of = Jeff Edwards Sent: Sunday, December 18, 2011 6:30 AM To: lml@lancaironline.net Subject: [LML] Re: MGL back up instrumentr =20 Why have unreliable backups?=20 AvSafe=20 Jeff Edwards 314.308.6719 mobile 636.532.5638 office Jeff.edwards@avsafe.com On Dec 16, 2011, at 8:44 AM, "John Barrett" = wrote: Infinity line MGL instruments =E2=80=93 they are intriguing as back up = gauges.=20 =20 Looks like the altimeter is Baro sensitive for input but needs electrons = for output. I spoke with Matt at their US distributor center and = learned that it uses pitot static inputs to pressure sensors that = generate output data for microprocessor to turn into altitude readout.=20 =20 Without electricity the gauge does not function, losing the = microprocessing component as well as the LCD display output. Does this = mean that in order to have good backup one would need to have a totally = mechanical altimeter? =20 Have found that two of my cheap 2.25=E2=80=9D gauges are failed with = case leaks. Have had them awhile but as far as I know they = haven=E2=80=99t been mishandled. I know the airspeed gauge is UMA. I = suspect the altimeter is the same brand. These are the two failed = instruments. =20 Advice welcome. =20 John Barrett =20 =20 =20 =20 =20 Regards, =20 John Barrett, CEO Leading Edge Composites PO Box 428 Port Hadlock, WA 98339 =20 www.carbinge.com =20 =20 ------=_NextPart_000_01AF_01CCBE9D.CFA65870 Content-Type: text/html; charset="utf-8" Content-Transfer-Encoding: quoted-printable

Terrance,

 

A most unorthodox choice of substitute for altimeter = and a/s indicators.  These instruments are primarily there as worst = case back up instruments for saving my ass when everything except the = engine fails while in IMC.  No more GPS, PFDS etc.  Maybe the = G496 will still work off it's battery. If so that may solve the problem = but if not?

 

A = purely mechanical AOA might help me to keep from stalling but how could = I rely on it to get me out of IMC safely?

 

John


Sent from my iPad

 


On Dec 19, 2011, at = 10:45 AM, Terrence O'Neill <troneill@charter.net> = wrote:

Lurking, might one quietly suggest that the ultimate = backup would be a simple, mechanical AOA vane on the = wing?

That's all you need to = keep from stalling, as you can see the = ground.

 

Terrence

L235/320 N211AL

 

 

On = Dec 19, 2011, at 9:00 AM, John Barrett wrote:



Good question, Jeff.  Some more naturally = follow:

 

1.     &nb= sp; Are you stating my backup instruments are = unreliable?

2.     &nb= sp; If so, what do you find unreliable about = them?

3.     &nb= sp; Assuming they are unreliable, what would you replace them = with?

 

I guess the real question is what instrument that gives airspeed or = altitude will never fail to provide needed information under any = circumstance?

 

 

From:=  Lancair = Mailing List [mailto:lml@lancaironline.net] On Behalf Of Jeff = Edwards
Sent: Sunday, December 18, 2011 = 6:30 AM
To: lml@lancaironline.net
Sub= ject: [LML] Re: MGL = back up instrumentr

 

Why have unreliable = backups? 

AvSafe 

Jeff Edwards

314.308.6719 = mobile

636.532.5638 = office


On Dec 16, 2011, at 8:44 AM, = "John Barrett" <jbarrett@carbinge.com> = wrote:

Infinity line MGL instruments =E2=80=93 they are = intriguing as back up gauges. 

 

Looks like the altimeter is Baro sensitive for input = but needs electrons for output.  I spoke with Matt at their US = distributor center and learned that it uses pitot static inputs to = pressure sensors that generate output data for microprocessor to turn = into altitude readout. 

 

Without electricity the gauge does not function, = losing the microprocessing component as well as the LCD display = output.  Does this mean that in order to have good backup one would = need to have a totally  mechanical = altimeter?

 

Have found that two of my cheap 2.25=E2=80=9D gauges = are failed with case leaks.  Have had them awhile but as far as I = know they haven=E2=80=99t been mishandled.  I know the airspeed = gauge is UMA.  I suspect the altimeter is the same  = brand.  These are the  two failed = instruments.

 

Advice welcome.

 

John Barrett

 

 

 

 

 

Regards,

 

John Barrett, CEO

Leading Edge Composites

PO Box 428

Port Hadlock, WA 98339

 

 

------=_NextPart_000_01AF_01CCBE9D.CFA65870--