Return-Path: Received: from [24.25.9.102] (HELO ms-smtp-03-eri0.southeast.rr.com) by logan.com (CommuniGate Pro SMTP 4.2b8) with ESMTP id 327413 for flyrotary@lancaironline.net; Tue, 20 Jul 2004 08:02:32 -0400 Received-SPF: error receiver=logan.com; client-ip=24.25.9.102; envelope-from=eanderson@carolina.rr.com Received: from EDWARD (clt25-78-058.carolina.rr.com [24.25.78.58]) by ms-smtp-03-eri0.southeast.rr.com (8.12.10/8.12.7) with SMTP id i6KC1viB014980 for ; Tue, 20 Jul 2004 08:01:58 -0400 (EDT) Message-ID: <001501c46e51$5fbe4d50$2402a8c0@EDWARD> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Oil Delta T was: 11th test flight Date: Tue, 20 Jul 2004 08:02:04 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0012_01C46E2F.D8523140" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1409 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2800.1409 X-Virus-Scanned: Symantec AntiVirus Scan Engine This is a multi-part message in MIME format. ------=_NextPart_000_0012_01C46E2F.D8523140 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Steve, the stock Mazda Oil cooler has a thermostat similar to the = coolant system but works the opposite. It stays open permitting most = oil to bypass the cooler when the oil is at or under some temp - I think = its around 146F but I could be wrong about the temp. Above that magic = temp the thermostat closes forcing the oil to flow through the cooling = tubes/fins. Ed Ed Anderson RV-6A N494BW Rotary Powered Matthews, NC ----- Original Message -----=20 From: Steve Brooks=20 To: Rotary motors in aircraft=20 Sent: Tuesday, July 20, 2004 7:36 AM Subject: [FlyRotary] Re: Oil Delta T was: 11th test flight Todd, That oil temperature delta also seems low to me, though I'd be happy = with 180 oil temperature. You mentioned a oil thermostat, and was not = aware of a thermostat on the oil other than the oil pellet, which I = removed. Is there another thermostat ? Where is it located ? =20 Steve Brooks =20 =20 -----Original Message----- From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]On = Behalf Of Todd Bartrim Sent: Tuesday, July 20, 2004 12:35 AM To: Rotary motors in aircraft Subject: [FlyRotary] Oil Delta T was: 11th test flight =20 Hi Al; Nope that's not a typo. It surprised me as well, but since oil has = far less heat carrying ability than water, that's what I attributed it = to. They were not calibrated sensors & the gauge didn't have fine = resolution, so that may account for some inaccuracy, but I did swap = sensor positions. This data was during cruise flight after temps had = stabilized. Actually I've been so busy flying that I've not had much time for = any reports or discussion, but there is a few things I've noticed. One = is that my oil temps used to lag behind my coolant temps, while now they = are very close to the same, since I've rebuilt the engine. I've been = thinking about this and one possible explanation that I've come up with = is; I used to have my rotors ceramic coated to reduce heat absorption = by the rotor and in turn by the oil, however when I tore the engine down = the ceramic coating was all but gone with only a few traces left. So I = assumed that it had been gone since soon after first start. However now = I wonder if the shock of detonation was enough to cause the coating to = flake off ? This would explain why now I'm seeing ~20F higher temps on = the oil than before the detonation & rebuild? Anybody have any thoughts = on this? My oil temp used to climb to approx 180F until the internal oil = thermostat would open, then would actually drop back down to ~160 in = cruise as the thermostat seemed to have some deadband. Now in cruise I = never see less than 180F and often during extended climbs I see 210F. = I've not mentioned it yet as the OAT has also been higher, but I've gone = out on some cooler days and still see the same temps. As I go through so = many different flight configurations of climb speeds/cruise = speeds/OAT/etc. I try to log some of this to try to discuss it. Sure = wish I could collect info from the EM2 for datalogging (hint, hint) =20 Todd Bartrim =20 RV9Endurance 13B Turbo Rotary C-FSTB "The world will always have a place for those that bring = hard work and determination to the things they do." =20 ------=_NextPart_000_0012_01C46E2F.D8523140 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Steve, the stock Mazda Oil cooler has a = thermostat=20 similar to the coolant system but works the opposite.  It stays = open=20 permitting most oil to bypass the cooler when the oil is at or under = some temp -=20 I think its around 146F but I could be wrong about the temp.  Above = that=20 magic temp the thermostat closes forcing the oil to flow through the = cooling=20 tubes/fins.
 
Ed
 
Ed Anderson
RV-6A N494BW Rotary Powered
Matthews, NC
----- Original Message -----
From:=20 Steve = Brooks
Sent: Tuesday, July 20, 2004 = 7:36=20 AM
Subject: [FlyRotary] Re: Oil = Delta T was:=20 11th test flight

Todd,

That=20 oil temperature delta also seems low to me, though I=92d be happy with = 180 oil=20 temperature.  You = mentioned a oil=20 thermostat, and was not aware of a thermostat on the oil other than = the oil=20 pellet, which I removed. Is there another thermostat ?  Where is it located=20 ?

 

Steve=20 Brooks

 

 

-----Original=20 Message-----
From: = Rotary=20 motors in aircraft [mailto:flyrotary@lancaironline.net]On Behalf Of Todd = Bartrim
Sent: Tuesday, July 20, 2004 = 12:35=20 AM
To: Rotary = motors in=20 aircraft
Subject: = [FlyRotary]=20 Oil Delta T was: 11th test flight

 

Hi=20 Al;

    = Nope that's = not a=20 typo. It surprised me as well, but since oil has far less heat = carrying=20 ability than water, that's what I attributed it to. They were not = calibrated=20 sensors & the gauge didn't have fine resolution, so that may = account for=20 some inaccuracy, but I did swap sensor positions. This data was during = cruise=20 flight after temps had stabilized.

    = Actually = I've been so=20 busy flying that I've not had much time for any reports or discussion, = but=20 there is a few things I've noticed. One is that my oil temps used to = lag=20 behind my coolant temps, while now they are very close to the same, = since I've=20 rebuilt the engine. I've been thinking about this and one possible = explanation=20 that I've come up with is;

    = I used to = have my=20 rotors ceramic coated to reduce heat absorption by the rotor and in = turn by=20 the oil, however when I tore the engine down the ceramic coating was = all but=20 gone with only a few traces left. So I assumed that it had been gone = since=20 soon after first start. However now I wonder if the shock of = detonation was=20 enough to cause the coating to flake off ? This would explain why now = I'm=20 seeing ~20F higher temps on the oil than before the detonation & = rebuild?=20 Anybody have any thoughts on this?

    = My oil temp = used to=20 climb to approx 180F until the internal oil thermostat would open, = then would=20 actually drop back down to ~160 in cruise as the thermostat = seemed to=20 have some deadband. Now in cruise I never see less than 180F and = often=20 during extended climbs I see 210F. I've not mentioned it yet as the = OAT has=20 also been higher, but I've gone out on some cooler days and still see = the same=20 temps. As I go through so many different flight configurations of = climb=20 speeds/cruise speeds/OAT/etc. I try to log some of this to try to = discuss it.=20 Sure wish I could collect info from the EM2 for datalogging (hint,=20 hint)

 

Todd=20 Bartrim

 

RV9Endurance

13B=20 Turbo Rotary

C-FSTB

           =  =20 "The world will always have a place for those that bring hard work and = determination to the things they do."

 

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