X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Sat, 23 Jan 2010 15:20:22 -0500 Message-ID: X-Original-Return-Path: Received: from snt0-omc3-s29.snt0.hotmail.com ([65.55.90.168] verified) by logan.com (CommuniGate Pro SMTP 5.3.1) with ESMTP id 4092718 for lml@lancaironline.net; Fri, 22 Jan 2010 20:34:12 -0500 Received-SPF: pass receiver=logan.com; client-ip=65.55.90.168; envelope-from=gary21sn@hotmail.com Received: from SNT112-DS3 ([65.55.90.135]) by snt0-omc3-s29.snt0.hotmail.com with Microsoft SMTPSVC(6.0.3790.3959); Fri, 22 Jan 2010 17:33:37 -0800 X-Originating-IP: [68.186.114.52] X-Originating-Email: [gary21sn@hotmail.com] X-Original-Message-ID: X-Original-Return-Path: gary21sn@hotmail.com From: "Gary Edwards" X-Original-To: "Lancair Mailing List" References: In-Reply-To: Subject: Re: Airspeed sensing switch needed X-Original-Date: Fri, 22 Jan 2010 17:33:35 -0800 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_1D2E_01CA9B89.0669C3E0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: MSN 9 X-MIMEOLE: Produced By MSN MimeOLE V10.00.0070.1500 Seal-Send-Time: Fri, 22 Jan 2010 17:33:35 -0800 X-OriginalArrivalTime: 23 Jan 2010 01:33:37.0362 (UTC) FILETIME=[15B9EB20:01CA9BCC] This is a multi-part message in MIME format. ------=_NextPart_000_1D2E_01CA9B89.0669C3E0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable No slow flight with the gear up then? Your slow flight and stall = practice will always be with the gear down? 90 knots is up there. =20 Gary=20 LNC2 ----- Original Message -----=20 From: Terrence O'Neill=20 To: lml@lancaironline.net=20 Sent: Friday, January 22, 2010 2:08 PM Subject: [LML] Re: Airspeed sensing switch needed Thanks for the info, Randy.=20 I have my airspeed sensing switch set a 90 knots, in the gear-up = circuit, so that no matter where the gear switch is, it can't raise the = gear unless the airspeed is greater than 90 knots. Same on landing. I fi forget to put the gear switch to down, the gear = will come down anyway at 90 knots. The only downside (no pun intended) is that should I want to make a = gear-su forced landing, I couldn't... and have considered adding a = bypass into the circuit. Any thoughts on that/ Terrence=20 L235/320 N211AL -------------------------------------------------------------------------= --- To: lml@lancaironline.net Date: Thu, 21 Jan 2010 16:53:05 -0500 From: randylsnarr@yahoo.com Subject: [LML] Re: Airspeed sensing switch needed Terrence, I have two sensing switches in my airplane. One used as a gear = up warning for landing like is being discussed, the other is exactly = what you described. 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, 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. Testing 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... 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 running. 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 prevention against stupidity of which most of us on rare = occasions are afflicted by... Randy Snarr N694RS 235/320 --- On Mon, 1/18/10, Terrence O'Neill = > wrote: From: Terrence O'Neill = > Subject: [LML] Re: Airspeed sensing switch needed To: lml@lancaironline.net Date: Monday, January 18, 2010, 6:43 AM Bill,=20 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? Terrence L235/320 N211AL On Jan 16, 2010, at 7:28 AM, Bill Kennedy wrote: I'm going to build the gear not down warning system = suggested by Randy Stuart in an earlier email. I thought Aircraft Spruce = had a airspeed sensing switch, 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 retractable time, but I've always been a little uneasy = with no warning system in my LNC2. I had hoped that I could talk Blue = Mountain Avionics into building a warning system into their EFIS, 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 =20 ------=_NextPart_000_1D2E_01CA9B89.0669C3E0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
No slow flight with the gear up then?  Your slow flight and = stall=20 practice will always be with the gear down?  90 knots is up=20 there.  
 
Gary
LNC2
----- Original Message -----
From: Terrence=20 O'Neill
Sent: Friday, January 22, 2010 = 2:08=20 PM
Subject: [LML] Re: Airspeed = sensing=20 switch needed

Thanks for the info, Randy.=20
I have my airspeed sensing switch set a 90 knots, in the gear-up = circuit,=20 so that no matter where the gear switch is, it can't raise the gear = unless the=20 airspeed is greater than 90 knots.
Same on landing.  I fi forget to put the gear switch to = down, the=20 gear will come down anyway at 90 knots.
The only downside (no pun intended) is that should I want to make = a=20 gear-su forced landing, I couldn't... and have considered adding a = bypass into=20 the circuit.
Any thoughts on that/
Terrence 
L235/320 N211AL



To: lml@lancaironline.net
Date: = Thu,=20 21 Jan 2010 16:53:05 -0500
From: randylsnarr@yahoo.com
Subjec= t:=20 [LML] Re: Airspeed sensing switch needed

=
Terrence,
I have two sensing switches in my = airplane.=20 One used as a gear up warning for landing like is being = discussed, the=20 other is exactly what you described. Both are plumbed into the = pitot=20 static system and are adjustable with a screwdriver under the = pilot=20 side panel. The squat switch opens the gear up circuit under = 70 kts. I=20 test it often on take off- I rotate and go gear up while the = AS is low=20 and the gear wont  come up, when the AS hits 80 or so up = they=20 come. I don't think these should be flying without a gear up = squat=20 switch of some kind. I am embarrased to admit I have already=20 inadvertently tested mine. Testing the gear on stands and used = the=20 dump valve to drop the gear and left the switch up. Started = the plane=20 a few days later and notice the switch in the up position = while=20 sitting idling on the ramp. I almost fainted... dropped the = switch and=20 closed the dump valve and then sat and thought about = it........Glad I=20 had one installed. My friend Dick Mitchel was not so lucky. He = raised=20 the gear in front of the hanger and dropped the plane on the = ground=20 while it was running. It is way too easy to do. I certified = crowd has=20 that point right...
Both cost me nothing as my neighbor is = in the=20 appliance business. He had a shoe box filled with those and he = gave me=20 2. They are a few ounces of prevention against stupidity of = which most=20 of us on rare occasions are afflicted by...

Randy=20 Snarr
N694RS
235/320

--- On Mon, 1/18/10, = Terrence=20 O'Neill <troneill@charter.net>=  wrote:

From:=20 Terrence O'Neill <troneill@charter.net>
Subj= ect:=20 [LML] Re: Airspeed sensing switch needed
To: lml@lancaironline.net
Date: = Monday, January 18, 2010, 6:43 AM

Bill,=20
Lurking because I share this interest.
What are the pros and cons of a simple airspeed sensing = switch=20 that just interrupts the gear-up switch circuit until a = selected=20 airspeed ... i.e. about 90 knots?
Terrence
L235/320 N211AL

On Jan 16, 2010, at 7:28 AM, Bill Kennedy = wrote:
I'm going to build the gear not down = warning=20 system suggested by Randy Stuart in an earlier email. I = thought=20 Aircraft Spruce had a airspeed sensing switch, but I = couldn't find=20 it in their catalog. Can any of you help me find a source = for the=20 pressure switch?

I've never had a close call with = the gear=20 in three plus thousand hours of retractable time, but I've = always=20 been a little uneasy with no warning system in my LNC2. I = had=20 hoped that I could talk Blue Mountain Avionics into = building a=20 warning system into their EFIS, but that didn't work out. = Randy's=20 system looks great to me and I'm eager to try it. I've = attached=20 Randy's drawing just in case others might want to revisit = the=20 idea.

Thanks -- Bill Kennedy
<Gear = Warning=20 1.JPG>--
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