Return-Path: Received: from swan.mail.pas.earthlink.net ([207.217.120.123] verified) by logan.com (CommuniGate Pro SMTP 4.2b2) with ESMTP id 3189853 for flyrotary@lancaironline.net; Sun, 25 Apr 2004 14:07:03 -0400 Received: from user-33qt50i.dialup.mindspring.com ([199.174.148.18] helo=Carol) by swan.mail.pas.earthlink.net with smtp (Exim 3.33 #1) id 1BHo1r-0007N0-00 for flyrotary@lancaironline.net; Sun, 25 Apr 2004 11:07:00 -0700 Message-ID: <000201c42af0$0ab83ae0$0000a398@Carol> From: "sqpilot@earthlink" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: FW: Sad story Date: Sun, 25 Apr 2004 12:54:09 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0041_01C42AC4.66A60750" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2720.3000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2739.300 This is a multi-part message in MIME format. ------=_NextPart_000_0041_01C42AC4.66A60750 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Re: [FlyRotary] Re: FW: Sad story ----- Original Message -----=20 From: Ed Anderson=20 To: Rotary motors in aircraft=20 Sent: Sunday, April 25, 2004 11:02 AM Subject: [FlyRotary] Re: FW: Sad story ----- Original Message -----=20 From: Al Gietzen=20 To: Rotary motors in aircraft=20 Sent: Sunday, April 25, 2004 11:37 AM Subject: [FlyRotary] Re: FW: Sad story On 4/24/04 7:53 PM, "Tracy Crook" wrote: It's possible I misunderstood the explanation but the theory of why = this happened seems unlikely. The sudden expansion of coolant would = have to be incredibly fast to cause an overpressure due to not being = able to get out through the overflow tube fast enough.=20 =20 Tracy =20 I just learned it was a =BC" line; i.d about 1/8". Trying to squirt = a pint or more through that in; what; less than a minute? That could do = it. I currently have a =BC" line on mine as an overflow from the = pressure bottle. The pressure would release from the cap (through the = upper gasket) but I would lose coolant in a similar scenario. I'm going = to rework that to a 3/8". That will give 4 times the flow area. Al I guess its still not clear to me how that situation would cause a = line to blow off. The max coolant pressure I have seen was around 24 = psi and that should not cause a line to blow off unless it was = inadequately clamped or some other defect. Hard to believe the pressure = increase due to the heat build up would be that fast. But, a larger = flow area should indeed relieve the pressure build up. Ed It would seem that 24 psi should not be a problem with a hose as far = as it's structual integrity. A standard, inexpensive air hose made in = China will withstand 125 psi from my air compressor, and one fitting on = the end of my air hose is only secured with a standard worm-gear type = hose clamp. (The hose was damaged after being run over by a = tractor-trailer, so I cut it and re-used the quick disconnect fitting by = just inserting it back into the hose and securing it with a hose clamp). = Of course the diameter of the air hose is larger. I'm just commenting on = the ability of a hose to take the pressure. I realize that this is air = pressure, not water pressure, but 125 psi is probably more pressure than = we would develop in our radiators. I might be missing something, but shouldn't the radiator cap = release the over-pressure instead of a hose failing, or is it that once = the radiator cap released it's pressure, and the only escape path was = through this small line? Not sure I totally understood the scenario. = Thanks for any efforts in making this clearer to me. Paul Conner =20 ------=_NextPart_000_0041_01C42AC4.66A60750 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Re: [FlyRotary] Re: FW: Sad story
 
----- Original Message -----
From:=20 Ed=20 Anderson
Sent: Sunday, April 25, 2004 = 11:02=20 AM
Subject: [FlyRotary] Re: FW: = Sad=20 story

----- Original Message = -----
From:=20 Al = Gietzen=20
To: Rotary motors in = aircraft=20
Sent: Sunday, April 25, 2004 = 11:37=20 AM
Subject: [FlyRotary] Re: FW: = Sad=20 story

 

On=20 4/24/04=20 7:53 PM, "Tracy Crook" <lors01@msn.com> = wrote:


 It's=20 possible I misunderstood the explanation but the theory of why this = happened=20 seems unlikely.  The sudden expansion of coolant would have to = be=20 incredibly fast to cause an overpressure due to not being able to = get out=20 through the overflow tube fast enough. =
 
Tracy

 

I just = learned it=20 was a =BC=94 line; i.d about 1/8=94.  Trying to squirt a pint = or more through=20 that in; what; less than a minute? That could do it.  I = currently have=20 a =BC=94 line on mine as an overflow from the pressure bottle. =  The=20 pressure would release from the cap (through the upper gasket) but I = would=20 lose coolant in a similar scenario.  I=92m going to rework that = to a=20 3/8=94.  That will give 4 times the flow = area.

 

Al

 

 

I guess its still not clear to me how that = situation would cause a line to blow off.  The max coolant = pressure I have seen was around 24 psi and that should not cause a = line to=20 blow off unless it was inadequately clamped or some other = defect.  Hard=20 to believe the pressure increase due to the heat build up would be = that=20 fast.  But, a larger flow area should indeed relieve the = pressure build=20 up.

 

Ed

 

It would seem that 24 psi should not be a = problem=20 with a hose as far as it's structual integrity.  A standard,=20 inexpensive air hose made in China will withstand 125 psi from my = air=20 compressor, and one fitting on the end of my air hose is only = secured with a=20 standard worm-gear type hose clamp. (The hose was damaged after = being run=20 over by a tractor-trailer, so I cut it and re-used the quick = disconnect=20 fitting by just inserting it back into the hose and securing it with = a hose=20 clamp). Of course the diameter of the air hose is larger. I'm = just=20 commenting on the ability of a hose to take the pressure.  I = realize=20 that this is air pressure, not water pressure, but 125 psi is = probably more=20 pressure than we would develop in our radiators.

      I might be = missing=20 something, but shouldn't the radiator cap release the over-pressure = instead=20 of a hose failing, or is it that once the radiator cap released it's = pressure, and the only escape path was through this small = line?  Not=20 sure I totally understood the scenario.  Thanks for any efforts = in=20 making this clearer to me.  Paul Conner

      =20

 

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