X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Fri, 22 Jan 2010 10:35:15 -0500 Message-ID: X-Original-Return-Path: Received: from col0-omc3-s5.col0.hotmail.com ([65.55.34.143] verified) by logan.com (CommuniGate Pro SMTP 5.3.1) with ESMTP id 4091198 for lml@lancaironline.net; Thu, 21 Jan 2010 18:41:24 -0500 Received-SPF: pass receiver=logan.com; client-ip=65.55.34.143; envelope-from=bill_kennedy_3@hotmail.com Received: from COL108-W2 ([65.55.34.135]) by col0-omc3-s5.col0.hotmail.com with Microsoft SMTPSVC(6.0.3790.3959); Thu, 21 Jan 2010 15:40:48 -0800 X-Original-Message-ID: X-Original-Return-Path: bill_kennedy_3@hotmail.com Content-Type: multipart/alternative; boundary="_3d036a6e-96d4-4cc3-bae6-ea948b624ed9_" X-Originating-IP: [71.111.118.215] From: Bill Kennedy X-Original-To: Subject: RE: [LML] Re: Airspeed sensing switch needed X-Original-Date: Thu, 21 Jan 2010 15:40:48 -0800 Importance: Normal In-Reply-To: References: MIME-Version: 1.0 X-OriginalArrivalTime: 21 Jan 2010 23:40:48.0855 (UTC) FILETIME=[28F7F670:01CA9AF3] --_3d036a6e-96d4-4cc3-bae6-ea948b624ed9_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable I like the Lancair landing gear system=2C but was surprised that there were= no "factory" solutions for gear warning and retraction on the ground. My f= irst priority is making sure it's down for landing=2C then I'll add the cir= cuit to prevent inadvertent retraction on the ground. To: lml@lancaironline.net Date: Thu=2C 21 Jan 2010 16:53:05 -0500 From: randylsnarr@yahoo.com Subject: [LML] Re: Airspeed sensing switch needed Terrence=2C I have two sensing switches in my airplane. One used as a gear up warning f= or landing like is being discussed=2C the other is exactly what you describ= ed. Both are plumbed into the pitot static system and are adjustable with a= screwdriver under the pilot side panel. The squat switch opens the gear up= circuit under 70 kts. I test it often on take off- I rotate and go gear up= while the AS is low and the gear wont come up=2C when the AS hits 80 or s= o up they come. I don't think these should be flying without a gear up squa= t switch of some kind. I am embarrased to admit I have already inadvertentl= y tested mine. Testing the gear on stands and used the dump valve to drop t= he gear and left the switch up. Started the plane a few days later and noti= ce the switch in the up position while sitting idling on the ramp. I almost= fainted... dropped the switch and closed the dump valve and then sat and thought about it........Glad I had = one installed. My friend Dick Mitchel was not so lucky. He raised the gear = in front of the hanger and dropped the plane on the ground while it was run= ning. It is way too easy to do. I certified crowd has that point right... Both cost me nothing as my neighbor is in the appliance business. He had a = shoe box filled with those and he gave me 2. They are a few ounces of preve= ntion against stupidity of which most of us on rare occasions are afflicted= by... Randy Snarr N694RS 235/320 --- On Mon=2C 1/18/10=2C Terrence O'Neill wrote: From: Terrence O'Neill Subject: [LML] Re: Airspeed sensing switch needed To: lml@lancaironline.net Date: Monday=2C January 18=2C 2010=2C 6:43 AM Bill=2CLurking because I share this interest.What are the pros and cons of = a simple airspeed sensing switch that just interrupts the gear-up switch ci= rcuit until a selected airspeed ... i.e. about 90 knots?TerrenceL235/320 N2= 11AL On Jan 16=2C 2010=2C at 7:28 AM=2C Bill Kennedy wrote:I'm going to build th= e gear not down warning system suggested by Randy Stuart in an earlier emai= l. I thought Aircraft Spruce had a airspeed sensing switch=2C but I couldn't find it in their catalog. Can any of you help me = find a source for the pressure switch? I've never had a close call with the gear in three plus thousand hours of r= etractable time=2C but I've always been a little uneasy with no warning sys= tem in my LNC2. I had hoped that I could talk Blue Mountain Avionics into b= uilding a warning system into their EFIS=2C but that didn't work out. Randy= 's system looks great to me and I'm eager to try it. I've attached Randy's = drawing just in case others might want to revisit the idea. Thanks -- Bill Kennedy -- For archives and unsub http://mail.lancaironline.net:81/lists/lml/List.html = --_3d036a6e-96d4-4cc3-bae6-ea948b624ed9_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable I like the Lancair landing gear system=2C but was surprised that there were= no "factory" solutions for gear warning and retraction on the ground. My f= irst priority is making sure it's down for landing=2C then I'll add the cir= cuit to prevent inadvertent retraction on the ground.

To: lml@lancaironline.net
Date: Thu=2C 21 Jan 2010 16:53:05 -0= 500
From: randylsnarr@yahoo.com
Subject: [LML] Re: Airspeed sensing s= witch needed

Terrence=2C
I have two sensing switc= hes in my airplane. One used as a gear up warning for landing like is being= discussed=2C the other is exactly what you described. Both are plumbed int= o the pitot static system and are adjustable with a screwdriver under the p= ilot side panel. The squat switch opens the gear up circuit under 70 kts. I= test it often on take off- I rotate and go gear up while the AS is low and= the gear wont =3B come up=2C when the AS hits 80 or so up they come. I= don't think these should be flying without a gear up squat switch of some = kind. I am embarrased to admit I have already inadvertently tested mine. Te= sting the gear on stands and used the dump valve to drop the gear and left = the switch up. Started the plane a few days later and notice the switch in = the up position while sitting idling on the ramp. I almost fainted... dropp= ed the switch and closed the dump valve and then sat and thought about it........Glad I had = one installed. My friend Dick Mitchel was not so lucky. He raised the gear = in front of the hanger and dropped the plane on the ground while it was run= ning. It is way too easy to do. I certified crowd has that point right...Both cost me nothing as my neighbor is in the appliance business. He had = a shoe box filled with those and he gave me 2. They are a few ounces of pre= vention against stupidity of which most of us on rare occasions are afflict= ed by...

Randy Snarr
N694RS
235/320

--- On Mon=2C 1/= 18/10=2C Terrence O'Neill <=3Btroneill@charter.net>=3B wrote= :

Fro= m: Terrence O'Neill <=3Btroneill@charter.net>=3B
Subject: [LML] Re: = Airspeed sensing switch needed
To: lml@lancaironline.net
Date: Monday= =2C January 18=2C 2010=2C 6:43 AM

Bill= =2C
Lurking because I share this interest.
What are the pros = and cons of a simple airspeed sensing switch that just interrupts the gear-= up switch circuit until a selected airspeed ... i.e. about 90 knots?
<= div>Terrence
L235/320 N211AL

On Jan 16=2C= 2010=2C at 7:28 AM=2C Bill Kennedy wrote:

I'm going to = build the gear not down warning system suggested by Randy Stuart in an earl= ier email. I thought Aircraft Spruce had a airspeed sensing switch=2C but I couldn't find it in their catalog. Can any of you help me = find a source for the pressure switch?

I've never had a close call w= ith the gear in three plus thousand hours of retractable time=2C but I've a= lways been a little uneasy with no warning system in my LNC2. I had hoped t= hat I could talk Blue Mountain Avionics into building a warning system into= their EFIS=2C but that didn't work out. Randy's system looks great to me a= nd I'm eager to try it. I've attached Randy's drawing just in case others m= ight want to revisit the idea.

Thanks -- Bill Kennedy
<= =3BGear Warning 1.JPG>=3B--
For archives and unsub =3Bhttp://mail.lancaironli= ne.net:81/lists/lml/List.html


= --_3d036a6e-96d4-4cc3-bae6-ea948b624ed9_--