X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Tue, 17 Jan 2012 15:21:54 -0500 Message-ID: X-Original-Return-Path: Received: from carbinge.com ([69.5.27.218] verified) by logan.com (CommuniGate Pro SMTP 5.4.3) with SMTP id 5353899 for lml@lancaironline.net; Tue, 17 Jan 2012 14:12:07 -0500 Received-SPF: none receiver=logan.com; client-ip=69.5.27.218; envelope-from=jbarrett@carbinge.com Received: (qmail 13423 invoked from network); 17 Jan 2012 19:11:32 -0000 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; h=X-Originating-IP:Reply-To:From:To:References:In-Reply-To:Subject:Date:Message-ID:MIME-Version:Content-Type:X-Mailer:Thread-Index:Content-Language; s=default; d=carbinge.com; b=XFO+GxtHJQwybBQqf7blCBGt3Q9AQszS7qseIcnW68Em7e+6EtCCQtzLvZr+uvfv7T9OZNKAAWj1XlvHv/IJswQ7+sC7It0Kokna3qo9f6xjxL9JttaHuGaXmYEh7YxcBIfAPjZIyhbIJHfaYyE7TRz25JuVAo52DvaJdx1UuQA=; X-Originating-IP: [24.143.115.170] Reply-To: From: "John Barrett" X-Original-To: "'Lancair Mailing List'" References: In-Reply-To: Subject: RE: [LML] Re: Steam Gauge Replacement X-Original-Date: Tue, 17 Jan 2012 11:11:30 -0800 X-Original-Message-ID: <013501ccd54b$d2657630$77306290$@com> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0136_01CCD508.C4423630" X-Mailer: Microsoft Office Outlook 12.0 Thread-Index: AczVNuTFdUg0+q8KQQq6D4tRaSvZlgAFD9pg Content-Language: en-us This is a multi-part message in MIME format. ------=_NextPart_000_0136_01CCD508.C4423630 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Good point. The commercials and the military for many years used a Jet (brand name) backup gyro that is electric. It is 2.25" in diameter and its utility was that it was supposed to deliver 15-20 minutes of useful data after loss of electric power as long as turns were gentle and g forces kept out of the picture. I have one in my IVP and I'm not sure just how reliable those promises are. It's been overhauled several years ago and now it looks like it holds attitude for a little while after shutdown, but I plan to do more monitoring of it as time goes on to find out just how much information would be available in the event of ---------------------@#%@. John From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of Adam Molny Sent: Tuesday, January 17, 2012 8:42 AM To: lml@lancaironline.net Subject: [LML] Re: Steam Gauge Replacement 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 ------=_NextPart_000_0136_01CCD508.C4423630 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

 

Good point.  The commercials and the military for many years = used a Jet (brand name) backup gyro that is electric.  It is = 2.25” in diameter and its utility was that it was supposed to = deliver 15-20 minutes of useful data after loss of electric power as = long as turns were gentle and g forces kept out of the = picture.

 

I have one in my IVP and I’m not sure just how reliable those = promises are.  It’s been overhauled several years ago and now = it looks like it holds attitude for a little while after shutdown, but I = plan to do more monitoring of it as time goes on to find out just how = much information would be available in the event of = ---------------------@#%@.

 

John

 

From:= = Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of = Adam Molny
Sent: Tuesday, January 17, 2012 8:42 = AM
To: lml@lancaironline.net
Subject: [LML] Re: = Steam Gauge Replacement

 

I&= #8217;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?

 

Th= anks,

Ad= am 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:&= nbsp; 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

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