X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fmailhost02.isp.att.net ([204.127.217.102] verified) by logan.com (CommuniGate Pro SMTP 5.3.7) with ESMTP id 4332017 for flyrotary@lancaironline.net; Mon, 31 May 2010 22:04:01 -0400 Received-SPF: none receiver=logan.com; client-ip=204.127.217.102; envelope-from=bbradburry@bellsouth.net Received: from desktop (adsl-85-113-131.mco.bellsouth.net[98.85.113.131]) by isp.att.net (frfwmhc02) with SMTP id <20100601020323H0200i3akge>; Tue, 1 Jun 2010 02:03:23 +0000 X-Originating-IP: [98.85.113.131] From: "Bill Bradburry" To: "'Rotary motors in aircraft'" References: In-Reply-To: Subject: RE: [FlyRotary] Re: Rear Rotor Coolant Leak Date: Mon, 31 May 2010 22:03:23 -0400 Message-ID: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_000C_01CB010D.16E43BD0" X-Mailer: Microsoft Office Outlook 11 Thread-Index: AcsBFnvp/V0VxLhuQ+q04uEVfuqm/gAF2Gjg X-MimeOLE: Produced By Microsoft MimeOLE V6.0.6001.18049 This is a multi-part message in MIME format. ------=_NextPart_000_000C_01CB010D.16E43BD0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable My system holds about two to two and a half gallons total. If Bobby = lost enough coolant that it was not touching the temp sender, the temp would = no longer be read. The temp reading would be the steam temp and the block could have been red hot at some locations inside the engine. There is a possibility the o-ring failed due to temp during this episode. =20 Bill B =20 _____ =20 From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Tracy Crook Sent: Monday, May 31, 2010 7:10 PM To: Rotary motors in aircraft Subject: [FlyRotary] Re: Rear Rotor Coolant Leak =20 If I read that correctly, you lost TWO GALLONS of coolant during that = hot taxi? The temps HAD to be more than 225F for that to happen. Tracy (in colorado) On Fri, May 21, 2010 at 4:44 PM, Bobby J. Hughes = wrote: =20 I have developed a small coolant leak in the #2 rotor of my renesis. It seems to be limited to the engine sitting for long periods of time. I discovered it when checking the plugs after the engine had not been = started for a couple of months while fitting the new supercharger. The leading = plug was wet. Pulling the prop through sprayed some coolant out of the = leading plug hole. I checked the fluid level and it was a little lower than I remember. I added some water and marked the level on a stick for = reference. The next day I check the level and found no measurable drop. Since I = had just installed the larger supercharger I decided to do a few ground runs = and check the coolant for leaks and keep a close eye on the water pressure. = I made several ground runs and everything was normal. The plane was = schedule for body work at a paint shop as soon as I could make the 50 mile trip. = I waited a few days and rechecked the fluid level. Again no measurable = drop. I then made three short flights around the airport to check out the new supercharger and kept a close eye on water pressure and temps. = Everything was normal. After checking the coolant level the next day I made the = trip to the painters. The flight was normal but the pilot was a little nervous. =20 The plane has not been started for six weeks and it sprayed maybe two tablespoons of coolant when pulling the prop through. I did not have my measuring stick but I could tell coolant level was a little lower then = the last time I had checked it.=20 =20 I will most likely have to replace the o-ring. I overheated one time = last summer during a =BE mile uphill taxi and OAT above 100F. The tarmac = temps could have been 115F. I shut the engine down when the coolant temps got = to 225F but they kept climbing. I think it took two gallons of water to = refill the system. =20 Since my water pressure is normal and does not leak down rapidly after shutdown is it possible the engine heat is sealing the O-ring ? Maybe I just need to re-torque the big bolts. =20 Bobby Hughes RV10 Renesis -- Homepage: http://www.flyrotary.com/ Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List.html =20 ------=_NextPart_000_000C_01CB010D.16E43BD0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

My system holds about two to two = and a half gallons total.=A0 If Bobby lost enough coolant that it was not = touching the temp sender, the temp would no longer be read.=A0 The temp reading would = be the steam temp and the block could have been red hot at some locations = inside the engine.=A0 There is a possibility the o-ring failed due to temp during = this episode.

 

Bill B

 

From: = Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Tracy Crook
Sent: Monday, May 31, = 2010 7:10 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: = Rear Rotor Coolant Leak

 

If I read that = correctly, you lost TWO GALLONS of coolant during that hot taxi?   The = temps HAD to be more than 225F for that to happen.

Tracy (in colorado)

On Fri, May 21, 2010 at 4:44 PM, Bobby J. Hughes <bhughes@qnsi.net> = wrote:

 

I have developed a small coolant leak in the #2 rotor of my = renesis. It seems to be limited to the engine sitting for long periods of time. I discovered it when checking the plugs after the engine had not been = started for a couple of months while fitting the new supercharger. The leading plug = was wet. Pulling the prop through sprayed some coolant out of the leading = plug hole. I checked the fluid level and it was a little lower than I = remember.  I added some water and marked the level on a stick for reference. = The next day I check the level and found no measurable drop.  Since I = had just installed the larger supercharger I decided to do a few ground runs and = check the coolant for leaks and keep a close eye on the water pressure. I made several ground runs and everything was normal. The plane was schedule = for body work at a paint shop as soon as I could make the 50 mile trip. I waited = a few days and rechecked the fluid level. Again no measurable drop.  I = then made three short flights around the airport to check out the new supercharger = and kept a close eye on water pressure and temps. Everything was normal. = After checking the coolant level the next day I made the trip to the painters. = The flight was normal but the pilot was a little = nervous.

 

 The plane has not been started for six weeks and it = sprayed maybe two tablespoons of coolant when pulling the prop through. I did not have = my measuring stick but I could tell coolant level was a little lower then = the last time I had checked it.

 

I will most likely have to replace the o-ring. I overheated one = time last summer during a =BE mile uphill taxi and OAT above 100F. The tarmac = temps could have been 115F. I shut the engine down when the coolant temps got = to 225F but they kept climbing. I think it took two gallons of water to refill = the system.

 

 Since my water pressure is normal and does not leak down = rapidly after shutdown is it possible the engine heat is sealing the O-ring ?  Maybe I just need to re-torque the big = bolts.

 

Bobby Hughes

RV10 Renesis


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