X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [207.46.163.138] (HELO na01-bn1-obe.outbound.protection.outlook.com) by logan.com (CommuniGate Pro SMTP 6.0.9e) with ESMTPS id 6796214 for lml@lancaironline.net; Tue, 25 Mar 2014 13:46:32 -0400 Received-SPF: pass receiver=logan.com; client-ip=207.46.163.138; envelope-from=rpastusek@htii.com Received: from BY2PR07MB550.namprd07.prod.outlook.com (10.141.217.145) by BY2PR07MB552.namprd07.prod.outlook.com (10.141.217.152) with Microsoft SMTP Server (TLS) id 15.0.898.11; Tue, 25 Mar 2014 17:45:52 +0000 Received: from BY2PR07MB550.namprd07.prod.outlook.com ([10.141.217.145]) by BY2PR07MB550.namprd07.prod.outlook.com ([10.141.217.145]) with mapi id 15.00.0898.005; Tue, 25 Mar 2014 17:45:52 +0000 From: Robert R Pastusek To: Lancair Mailing List Subject: RE: [LML] Legacy canopy safety latch Thread-Topic: [LML] Legacy canopy safety latch Thread-Index: AQHPSEGY3CKTr8J6LkagShm+xnI1iZryDaDQ Date: Tue, 25 Mar 2014 17:45:50 +0000 Message-ID: <5c4a68e561874700b46f3c2d130fa539@BY2PR07MB550.namprd07.prod.outlook.com> References: In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [108.28.164.93] x-forefront-prvs: 01613DFDC8 x-forefront-antispam-report: SFV:NSPM;SFS:(10019001)(428001)(377454003)(199002)(189002)(46034005)(4396001)(56776001)(76482001)(47736001)(54316002)(50986001)(47976001)(54356001)(95416001)(15975445006)(81816001)(56816005)(98676001)(49866001)(81686001)(93516002)(51856001)(53806001)(19300405004)(94946001)(97336001)(19580405001)(19580395003)(83322001)(16236675002)(80976001)(97186001)(94316002)(87936001)(87266001)(2656002)(90146001)(92566001)(93136001)(85852003)(83072002)(95666003)(46102001)(85306002)(80022001)(59766001)(74366001)(74706001)(63696002)(33646001)(74876001)(65816001)(77982001)(15202345003)(76796001)(81342001)(74316001)(81542001)(69226001)(66066001)(76786001)(20776003)(86362001)(79102001)(74662001)(76576001)(31966008)(74502001)(47446002)(24736002);DIR:OUT;SFP:1102;SCL:1;SRVR:BY2PR07MB552;H:BY2PR07MB550.namprd07.prod.outlook.com;FPR:FC1FF254.82FB9FD5.C1D3BF73.58E95160.20462;MLV:sfv;PTR:InfoNoRecords;A:1;MX:1;LANG:en; received-spf: None (: htii.com does not designate permitted sender hosts) Content-Type: multipart/alternative; boundary="_000_5c4a68e561874700b46f3c2d130fa539BY2PR07MB550namprd07pro_" MIME-Version: 1.0 X-OriginatorOrg: htii.com --_000_5c4a68e561874700b46f3c2d130fa539BY2PR07MB550namprd07pro_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable I had a chance to talk to Larry Hinman from Lancair about this during our C= ontinental-sponsored Maintenance Clinic in Alabama this weekend. Most of yo= u know that Valin Thorn, supported by others, has continued to refine the p= roblem and potential solutions. Larry offered that the Lancair engineers are now working on the design of a= warning light kit that would activate any time the canopy is closed but no= t fully latched. While this is recognized as only one of several recommende= d solutions, and has been recommended by several as an adjunct to a re-desi= gned latching system, a warning light would be very easy to install--and to= retrofit--as compared to a re-designed latching mechanism. While not as el= egant as what "could be done," I wanted to recognize and advise you of this= effort. Many builders, including me, have already incorporated such a door warning = light system in our aircraft. For me, it's worked twice to advise when one = of the eight complex latches in my IV-P lost a cir-clip and failed to go "o= ver-center." Warning lights, if properly designed, are very reliable and ea= sy to install. Why not consider doing this while folks work on other "mecha= nical" solutions? Bob From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of Stev= ens Family Sent: Tuesday, March 25, 2014 11:47 AM To: lml@lancaironline.net Subject: [LML] Legacy canopy safety latch I know the thread about designing a safety latch for the Legacy canopy has = pretty much run its course. However, I was discussing the issues with a col= league recently, and we came up with an idea. I should add, that neither of= us has any particular involvement with the Legacy, as I am building a L360= , so this idea is offered as a concept only, for those of you with a more p= ressing interest in the problem to throw around in the ideas pool. Attached is a very rough sketch of the idea, if you can follow it. If it co= uld be made to work, it would have the advantages as follows.... 1 It needs no input from the occupants to arm or latch = it. The vane would move it to its' armed position once the airspeed reached= that required to turn the weather vane parallel to the centreline of the a= ircraft. 2 It has no electrical components 3 In an emergency, rescuers unfamiliar with the aircraf= t's latching mechanism would not need to do anything to unlatch it, but wou= ld need only to operate the normal latch, because the spring loaded weather= vane would turn at right angles to the aircraft centreline once the airspe= ed dropped below the designated speed. The negatives are 1 It might look a bit ugly from the outside, unless it = is artistically sculptured 2 It would add something of an obstacle at about head l= evel for the occupants when reaching into the baggage area in flight. I hope this isn't a really silly idea!! Regards, Rob Stevens Perth, Western Australia. --_000_5c4a68e561874700b46f3c2d130fa539BY2PR07MB550namprd07pro_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

I had a chance to talk to Larry Hinman from Lancair about this during our Con= tinental-sponsored Maintenance Clinic in Alabama this weekend. Most of you = know that Valin Thorn, supported by others, has continued to refine the pro= blem and potential solutions.

 

Larry offered that the Lancair engineers are now working on the= design of a warning light kit that would activate any time the canopy is closed but not fully latched. While this is recogni= zed as only one of several recommended solutions, and has been recommended = by several as an adjunct to a re-designed latching system, a warning light = would be very easy to install--and to retrofit--as compared to a re-designed latching mechanism. While not as= elegant as what “could be done,” I wanted to recognize and adv= ise you of this effort.


Many builders, including me, have already incorporated such a door warning = light system in our aircraft. For me, it’s worked twice to advise whe= n one of the eight complex latches in my IV-P lost a cir-clip and failed to go “over-center.= ” Warning lights, if properly designed, are very reliable and easy to= install. Why not consider doing this while folks work on other “mech= anical” solutions?

 

Bob

 

 

 

 

From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of Stevens Fa= mily
Sent: Tuesday, March 25, 2014 11:47 AM
To: lml@lancaironline.net
Subject: [LML] Legacy canopy safety latch

 

I know the thread about designing a safety latch for the Legacy canopy h= as pretty much run its course. However, I was discussing the issues with a = colleague recently, and we came up with an idea. I should add, that neither of us has any particular involvement w= ith the Legacy, as I am building a L360, so this idea is offered as a conce= pt only, for those of you with a more pressing interest in the problem to t= hrow around in the ideas pool.

 

Attached is a very rough sketch of the idea, if you can follow it. If it= could be made to work, it would have the advantages as follows….

1It needs no input from the occupants to arm or latch it. The van= e would move it to its’ armed position once the airspeed reached that= required to turn the weather vane parallel to the centreline of the aircraft.

2It has no electrical components

3In an emergency, rescuers unfamiliar with the aircraft’s l= atching mechanism would not need to do anything to unlatch it, but would ne= ed only to operate the normal latch, because the spring loaded weather vane would turn at right angles to the aircraft = centreline once the airspeed dropped below the designated speed.=

 

The negatives are

1It might look a bit ugly from the outside, unless it is artistic= ally sculptured

2It would add something of an obstacle at about head level for th= e occupants when reaching into the baggage area in flight.

 

I hope this isn’t a really silly idea!!

 

Regards,

 

Rob Stevens

Perth,

Western Australia.

 

--_000_5c4a68e561874700b46f3c2d130fa539BY2PR07MB550namprd07pro_--