X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Tue, 17 Jan 2012 11:41:36 -0500 Message-ID: X-Original-Return-Path: Received: from mta2.srv.hcvlny.cv.net ([167.206.4.197] verified) by logan.com (CommuniGate Pro SMTP 5.4.3) with ESMTP id 5353231 for lml@lancaironline.net; Tue, 17 Jan 2012 08:20:27 -0500 Received-SPF: none receiver=logan.com; client-ip=167.206.4.197; envelope-from=Adam@ValidationPartners.com Received: from VpiWorkstation1 (ool-4575759e.dyn.optonline.net [69.117.117.158]) by mta2.srv.hcvlny.cv.net (Sun Java System Messaging Server 6.2-8.04 (built Feb 28 2007)) with ESMTP id <0LXY001BZ2D27LP0@mta2.srv.hcvlny.cv.net> for lml@lancaironline.net; Tue, 17 Jan 2012 08:19:51 -0500 (EST) X-Original-Date: Tue, 17 Jan 2012 08:20:24 -0500 From: Adam Molny Subject: RE: [LML] Steam Gauge Replacement In-reply-to: X-Original-To: lml@lancaironline.net X-Original-Message-id: <691A93D87A1C4E589344932DCF82A4E5@VpiWorkstation1> MIME-version: 1.0 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2900.6157 X-Mailer: Microsoft Office Outlook 11 Content-type: multipart/alternative; boundary="Boundary_(ID_dQ1fatq1qJbn2YPC2l8wig)" Thread-index: AczUp3tmy4QBG8wZQ/Kzmvw+jmJHxAAceaog References: This is a multi-part message in MIME format. --Boundary_(ID_dQ1fatq1qJbn2YPC2l8wig) Content-type: text/plain; charset=us-ascii Content-transfer-encoding: 7BIT I've noticed that the term 'spinning mass gyro' is being used in this discussion, as opposed to 'vacuum driven gyro'. Does that mean you all are comfortable with an electrically driven AI? That would make sense if the AI contains only contains a simple electric motor which consists of windings and permanent magnets. Those tend to be very tolerant of voltage spikes. But if the electric AI contains even a single electronic component (voltage regulator, integrated circuit, etc), wouldn't that make it vulnerable to the same lightning strike that took out my fancy EFIS, charging system, isolating diode, and backup battery? Thanks, Adam Molny _____ From: John Barrett [mailto:jbarrett@carbinge.com] Sent: Monday, January 16, 2012 2:42 PM To: lml@lancaironline.net Subject: RE: [LML] Steam Gauge Replacement Answer is pretty simple. What makes it work? If loss of electricity will mean loss of the instrument then that's the reason not to replace your spinning mass gyro with this. There are a couple of other instruments on the market similar to this and they are very tempting but they have the same drawback. The steam gauges are there for only one reason - save your ass if everything that can hit your avionics does so. John Barrett From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of John Hafen Sent: Monday, January 16, 2012 9:35 AM To: lml@lancaironline.net Subject: [LML] Steam Gauge Replacement Gents: Just saw this in "Sport Aviation." I have two Cheltons and a backup steam ADI. Seems this little unit gives Airspeed and Heading and Altitude and VS, as well as attitude. Any reason to not replace my single purpose steam attitude indicator with something like this for a thousand bucks? Cheers, John Hafen IVP 413AJ 350 hours --Boundary_(ID_dQ1fatq1qJbn2YPC2l8wig) Content-type: text/html; charset=us-ascii Content-transfer-encoding: 7BIT

I’ve noticed that the term ‘spinning mass gyro’ is being used in this discussion, as opposed to ‘vacuum driven gyro’. Does that mean you all are comfortable with an electrically driven AI? That would make sense if the AI contains only contains a simple electric motor which consists of windings and permanent magnets. Those tend to be very tolerant of voltage spikes. But if the electric AI contains even a single electronic component (voltage regulator, integrated circuit, etc), wouldn’t that make it vulnerable to the same lightning strike that took out my fancy EFIS, charging system, isolating diode, and backup battery?

Thanks,

Adam Molny

From: John Barrett [mailto:jbarrett@carbinge.com]
Sent: Monday, January 16, 2012 2:42 PM
To: lml@lancaironline.net
Subject: RE: [LML] Steam Gauge Replacement

Answer is pretty simple. What makes it work? If loss of electricity will mean loss of the instrument then that’s the reason not to replace your spinning mass gyro with this. There are a couple of other instruments on the market similar to this and they are very tempting but they have the same drawback. The steam gauges are there for only one reason - save your ass if everything that can hit your avionics does so.

John Barrett

From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of John Hafen
Sent: Monday, January 16, 2012 9:35 AM
To: lml@lancaironline.net
Subject: [LML] Steam Gauge Replacement

Gents: Just saw this in "Sport Aviation." I have two Cheltons and a backup
steam ADI. Seems this little unit gives Airspeed and Heading and Altitude and
VS, as well as attitude.

Any reason to not replace my single purpose steam attitude indicator with
something like this for a thousand bucks?

Cheers,

John Hafen
IVP 413AJ 350 hours

--Boundary_(ID_dQ1fatq1qJbn2YPC2l8wig)--