X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from ms-smtp-04.southeast.rr.com ([24.25.9.103] verified) by logan.com (CommuniGate Pro SMTP 5.1c.3) with ESMTP id 1330511 for flyrotary@lancaironline.net; Mon, 14 Aug 2006 08:58:41 -0400 Received-SPF: pass receiver=logan.com; client-ip=24.25.9.103; envelope-from=eanderson@carolina.rr.com Received: from edward2 (cpe-024-074-111-186.carolina.res.rr.com [24.74.111.186]) by ms-smtp-04.southeast.rr.com (8.13.6/8.13.6) with SMTP id k7ECvr3q005041 for ; Mon, 14 Aug 2006 08:57:54 -0400 (EDT) Message-ID: <000f01c6bfa1$b40e6540$2402a8c0@edward2> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Emailing: DoorOpenLside.jpg Date: Mon, 14 Aug 2006 09:01:05 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_000C_01C6BF80.2CB7A5F0" 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 X-Virus-Scanned: Symantec AntiVirus Scan Engine This is a multi-part message in MIME format. ------=_NextPart_000_000C_01C6BF80.2CB7A5F0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hi Richard, Thanks for the information. I was told that if I plumbed the lines such = that the pump fed the center of the line going to each cylinder that the = pressures would be pretty much equal. So I tried that and it appears to = work just fine - any drop in pressure due to friction in the lines is = apparently equal to both cylinders. It took a bit more hose to do it = that way - but the hose was cheaper than an equalizer valve. Tracy = Crook indicated that is what he had to do for a similar door - feed the = cylinders from a "T" at the mid point between both. Yes, my operating control is a momentary push button also - meaning once = you take your finger off it the motor and motion stop - opening or = closing. I also have a keyed battery switch on my battery box - so when = the operation is finished I can remove it and prevent anybody from = intentionally or unintentionally operating the door - without first = inserting the key and turning the power on. I am putting on limit switches such that my system will not operate = unless all locks are first opened and then will have one to prevent the = door from opening beyond a certain point (85 deg?). Good to hear you have had 7 years with no problem operation Ed ----- Original Message -----=20 From: Richard Sohn=20 To: Rotary motors in aircraft=20 Sent: Monday, August 14, 2006 10:48 AM Subject: [FlyRotary] Re: Emailing: DoorOpenLside.jpg 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_000C_01C6BF80.2CB7A5F0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Hi Richard,
 
Thanks for the information.  I was told that if = I plumbed=20 the lines such that the pump fed the center of the line going to each = cylinder=20 that the pressures would be pretty much equal.  So I tried that and = it=20 appears to work just fine - any drop in pressure due to friction in the = lines is=20 apparently equal to both cylinders.  It took a bit more hose = to do it=20 that way - but the hose was cheaper than an equalizer valve.  =  Tracy=20 Crook indicated that is what he had to do for a similar door - feed the=20 cylinders from a "T" at the mid point between both.
 
Yes, my operating control is a momentary push button = also -=20 meaning once you take your finger off it the motor and motion stop - = opening or=20 closing.  I also have a keyed battery switch on my battery box - so = when=20 the operation is finished I can remove it and prevent anybody from = intentionally=20 or unintentionally operating the door - without first inserting the key = and=20 turning the power on.
 
I am putting on limit switches such that my system = will not=20 operate unless all locks are first opened and then will have one to = prevent the=20 door from opening beyond a certain point (85 deg?).
 
Good to hear you have had 7 years with no problem=20 operation
 
Ed
----- Original Message -----
From:=20 Richard = Sohn=20
Sent: Monday, August 14, 2006 = 10:48=20 AM
Subject: [FlyRotary] Re: = Emailing:=20 DoorOpenLside.jpg

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=20 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=20 makes it impossible to walk away while the door is opening. This makes = me=20 watch the door all the time while it is going up or down. Some times, = I even=20 open the door only partially and leave it there all day long on the = hydraulics=20 without any problem.
I think you did the right pick with the hydraulics.
FWIW.
 
Richard Sohn
N-2071U
 
 
----- Original Message -----
From:=20 Ed Anderson
To: Rotary motors in = aircraft=20
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=20 is 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=20 hose break [or leak over time] which would lower one cylinder but = not the=20 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=20 the aluminum block, up flow pushes through the restrictor and = check=20 valve, 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=20 aircraft
Sent: Sunday, August = 13, 2006=20 11:36 PM
Subject: [FlyRotary] = Re:=20 Emailing: 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=20 down the opening a bit, but would probably slow down the = closing=20 even more.  I'll check into it.
 
Ed
Assemble a swing check valve in parallel with your = restrictor.=20 So, most of the up flow is unrestricted and any downflow = closes the=20 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=20 Edition.
Version: 7.1.405 / Virus Database: 268.10.9/417 - = Release=20 Date:=20 8/11/2006
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