X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [66.219.56.245] (HELO mail.qnsi.net) by logan.com (CommuniGate Pro SMTP 5.3.7) with ESMTP id 4332323 for flyrotary@lancaironline.net; Tue, 01 Jun 2010 08:12:06 -0400 Received-SPF: none receiver=logan.com; client-ip=66.219.56.245; envelope-from=bhughes@qnsi.net Return-Receipt-To: "Bobby J. Hughes" Subject: RE: [FlyRotary] Re: Rear Rotor Coolant Leak MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----_=_NextPart_001_01CB018C.22E25AA0" Date: Tue, 1 Jun 2010 07:12:50 -0600 Disposition-Notification-To: "Bobby J. Hughes" Content-class: urn:content-classes:message Message-ID: <74120FDE88CAFE4DBDA8814BCE20A3F32084C2@qnsi-mail.qnsi.net> X-MS-Has-Attach: X-MimeOLE: Produced By Microsoft Exchange V6.5 X-MS-TNEF-Correlator: Thread-Topic: [FlyRotary] Re: Rear Rotor Coolant Leak Thread-Index: AcsBHwyPKFA/pNjFT/GFOwlqSLMf3QAY6Lsg References: From: "Bobby J. Hughes" To: "Rotary motors in aircraft" This is a multi-part message in MIME format. ------_=_NextPart_001_01CB018C.22E25AA0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable "I shut the engine down when the coolant temps got to 225F but they = kept climbing." =20 The coolant loss happened after I shut the engine down. I have one = coolant tank with a 23 psi cap. The engine much got hotter than 225F but = it was not running at the time.=20 =20 Bobby ________________________________ From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On = Behalf Of Tracy Crook Sent: Monday, May 31, 2010 6:10 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 = 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 =09 =09 ------_=_NextPart_001_01CB018C.22E25AA0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
 "I shut the=20 engine down when the coolant temps got to 225F but they kept = climbing."
 
The coolant loss happened after I shut the engine = down. I have=20 one coolant tank with a 23 psi cap. The engine much got hotter than = 225F=20 but it was not running at the time.
 
Bobby

From: Rotary motors in aircraft=20 [mailto:flyrotary@lancaironline.net] On Behalf Of Tracy=20 Crook
Sent: Monday, May 31, 2010 6:10 PM
To: Rotary = motors=20 in aircraft
Subject: [FlyRotary] Re: Rear Rotor Coolant=20 Leak

If I read that correctly, you lost TWO GALLONS of coolant = during that=20 hot taxi?   The temps HAD to be more than 225F for that to=20 happen.

Tracy (in colorado)

On Fri, May 21, 2010 at 4:44 PM, Bobby J. = Hughes <bhughes@qnsi.net>=20 wrote:
 

I have developed a = small=20 coolant leak in the #2 rotor of my renesis. It seems to be limited to = the=20 engine sitting for long periods of time. I discovered it when checking = the=20 plugs after the engine had not been started for a couple of months = while=20 fitting the new supercharger. The leading plug was wet. Pulling the = prop=20 through sprayed some coolant out of the leading plug hole. I checked = the fluid=20 level and it was a little lower than I remember.  I = added=20 some water and marked the level on a stick for reference. The next day = I check=20 the level and found no measurable drop.  Since I had = just=20 installed the larger supercharger I decided to do a few ground runs = and check=20 the coolant for leaks and keep a close eye on the water pressure. I = made=20 several ground runs and everything was normal. The plane was schedule = for body=20 work at a paint shop as soon as I could make the 50 mile trip. I = waited a few=20 days and rechecked the fluid level. Again no measurable = drop. =20 I then made three short flights around the airport to check out = the new=20 supercharger and kept a close eye on water pressure and temps. = Everything was=20 normal. After checking the coolant level the next day I made the trip = to the=20 painters. The flight was normal but the pilot was a little = nervous.

 

 The plane=20 has not been started for six weeks and it sprayed maybe two = tablespoons of=20 coolant when pulling the prop through. I did not have my measuring = stick but I=20 could tell coolant level was a little lower then the last time I had = checked=20 it.

 

I will most likely = have to=20 replace the o-ring. I overheated one time last summer during a =BE = mile uphill=20 taxi and OAT above 100F. The tarmac temps could have been 115F. I shut = the=20 engine down when the coolant temps got to 225F but they kept climbing. = I think=20 it took two gallons of water to refill the system.

 

 Since my=20 water pressure is normal and does not leak down rapidly after shutdown = is it=20 possible the engine heat is sealing the O-ring ? =  Maybe I=20 just need to re-torque the big bolts.

 

Bobby=20 Hughes

RV10=20 Renesis


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