X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from access.aic-fl.com ([204.49.76.2] verified) by logan.com (CommuniGate Pro SMTP 5.1c.3) with ESMTP id 1330500 for flyrotary@lancaironline.net; Mon, 14 Aug 2006 08:49:53 -0400 Received-SPF: none receiver=logan.com; client-ip=204.49.76.2; envelope-from=unicorn@gdsys.net Received: from b9k4u9 (unverified [204.49.76.39]) by access.aic-fl.com (Rockliffe SMTPRA 4.5.6) with SMTP id for ; Mon, 14 Aug 2006 07:46:55 -0500 Message-ID: <003001c6bfb0$b2582bf0$274c31cc@b9k4u9> From: "Richard Sohn" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Emailing: DoorOpenLside.jpg Date: Mon, 14 Aug 2006 07:48:19 -0700 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_002D_01C6BF76.02B880D0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.2869 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2962 This is a multi-part message in MIME format. ------=_NextPart_000_002D_01C6BF76.02B880D0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hi Ed, I have a similar door on my hanger, it is 30ft wide and made of steel = sq-tubing. It is lifted by two hydr cylinders through a knee-lever which = goes over dead center at full open. I had to install a hand valve on one = side for balancing the opening and closing with changing temperature. = This is much simpler than an automatic balancer, and it will not work = without any balancing. There was no leak or any other problems in 7years = of operation.=20 One safety feature I installed is a temporary pushbutton switch, which = makes it impossible to walk away while the door is opening. This makes = me watch the door all the time while it is going up or down. Some times, = I even open the door only partially and leave it there all day long on = the hydraulics without any problem. I think you did the right pick with the hydraulics. FWIW. Richard Sohn N-2071U ----- Original Message -----=20 From: Ed Anderson=20 To: Rotary motors in aircraft=20 Sent: Monday, August 14, 2006 4:54 AM Subject: [FlyRotary] Re: Emailing: DoorOpenLside.jpg Hi Jarrett, Actually, I believe that if the hose breaks anywhere the pressure will = drop everywhere and the two cylinders will both lower (more or less) = together. I could be wrong about that, but until an hydraulic expert = tells me otherwise, that is what my eyeball analysis indicates to me. Ed ----- Original Message -----=20 From: Jarrett & Heidi Johnson=20 To: Rotary motors in aircraft=20 Sent: Monday, August 14, 2006 12:11 AM Subject: [FlyRotary] Re: Emailing: DoorOpenLside.jpg Ed, looks like you have it well in hand.. any plan however, for a = hose break [or leak over time] which would lower one cylinder but not = the other? Jarrett ----- Original Message -----=20 From: Ed Anderson=20 To: Rotary motors in aircraft=20 Sent: Sunday, August 13, 2006 9:52 PM Subject: [FlyRotary] Re: Emailing: DoorOpenLside.jpg Good Idea, Lynn. Screw the hose in one side of the aluminum = block, up flow pushes through the restrictor and check valve, back flow = closes check valve and only flows through restrictor. Shouldn't be = that hard to make. Thanks Ed ----- Original Message -----=20 From: Lehanover@aol.com=20 To: Rotary motors in aircraft=20 Sent: Sunday, August 13, 2006 11:36 PM Subject: [FlyRotary] Re: Emailing: DoorOpenLside.jpg In a message dated 8/13/2006 11:04:01 P.M. Eastern Daylight = Time, eanderson@carolina.rr.com writes: Not a bad idea, Ben. They would slow down the opening a bit, = but would probably slow down the closing even more. I'll check into it. Ed Assemble a swing check valve in parallel with your restrictor. = So, most of the up flow is unrestricted and any downflow closes the = check valve and goes through the restrictor. Or machine the whole thing in a small block of aluminum. Lynn E. Hanover -------------------------------------------------------------------------= - No virus found in this incoming message. Checked by AVG Free Edition. Version: 7.1.405 / Virus Database: 268.10.9/417 - Release Date: = 8/11/2006 ------=_NextPart_000_002D_01C6BF76.02B880D0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Hi Ed,
 
I have a similar door on my hanger, it is 30ft wide and made of = steel=20 sq-tubing. It is lifted by two hydr cylinders through a knee-lever which = goes=20 over dead center at full open. I had to install a hand valve on one side = for=20 balancing the opening and closing with changing temperature. This is = much=20 simpler than an automatic balancer, and it will not work without any = balancing.=20 There was no leak or any other problems in 7years of operation.
One safety feature I installed is a temporary pushbutton switch, = which=20 makes it impossible to walk away while the door is opening. This makes = me watch=20 the door all the time while it is going up or down. Some times, I even = open the=20 door only partially and leave it there all day long on the hydraulics = without=20 any problem.
I think you did the right pick with the hydraulics.
FWIW.
 
Richard Sohn
N-2071U
 
 
----- Original Message -----
From:=20 Ed=20 Anderson
Sent: Monday, August 14, 2006 = 4:54=20 AM
Subject: [FlyRotary] Re: = Emailing:=20 DoorOpenLside.jpg

Hi Jarrett,
 
Actually, I believe that if the hose breaks=20 anywhere the pressure will drop = everywhere=20 and the two cylinders will both lower (more or less) together.  I = could=20 be wrong about that, but until an hydraulic expert tells me otherwise, = that is=20 what my eyeball analysis indicates to me.
 
Ed
----- Original Message -----
From:=20 Jarrett=20 & Heidi Johnson
To: Rotary motors in = aircraft=20
Sent: Monday, August 14, 2006 = 12:11=20 AM
Subject: [FlyRotary] Re: = Emailing:=20 DoorOpenLside.jpg

Ed, looks like you have it well in hand.. any plan however, for = a hose=20 break [or leak over time] which would lower one cylinder but not the = other?
 
Jarrett
 
 
----- Original Message ----- =
From:=20 Ed Anderson
To: Rotary motors in = aircraft=20
Sent: Sunday, August 13, = 2006 9:52=20 PM
Subject: [FlyRotary] Re: = Emailing:=20 DoorOpenLside.jpg

Good Idea, Lynn.  Screw the hose in one = side of the=20 aluminum block, up flow pushes through the restrictor and check = valve,=20 back flow closes check valve and only flows through=20 restrictor.   Shouldn't be that hard to = make.
 
Thanks
 
Ed
 
----- Original Message -----
From:=20 Lehanover@aol.com
To: Rotary motors in = aircraft=20
Sent: Sunday, August 13, = 2006 11:36=20 PM
Subject: [FlyRotary] Re: = Emailing:=20 DoorOpenLside.jpg

In a message dated 8/13/2006 11:04:01 P.M. Eastern Daylight = Time,=20 eanderson@carolina.rr.com=20 writes:
Not a bad idea, Ben.  They would = slow down=20 the opening a bit, but would probably slow down the closing = even=20 more.  I'll check into it.
 
Ed
Assemble a swing check valve in parallel with your = restrictor. So,=20 most of the up flow is unrestricted and any downflow closes the = check=20 valve and goes through the restrictor.
Or machine the whole thing in a small block of = aluminum.
 
Lynn E. Hanover

No virus found in this incoming message.
Checked by AVG = Free=20 Edition.
Version: 7.1.405 / Virus Database: 268.10.9/417 - = Release=20 Date: = 8/11/2006
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