Return-Path: Received: from [216.52.245.18] (HELO ispwestemail1.aceweb.net) by logan.com (CommuniGate Pro SMTP 4.1.5) with ESMTP id 2633642 for flyrotary@lancaironline.net; Sun, 12 Oct 2003 09:35:05 -0400 Received: from 7n7z201 (unverified [209.206.0.18]) by ispwestemail1.aceweb.net (Vircom SMTPRS 2.1.268) with SMTP id for ; Sun, 12 Oct 2003 06:41:01 -0700 Message-ID: <061b01c390c5$3e192c20$252dbbd0@7n7z201> From: "William" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: solo's & Delta T... no more emergencies Date: Sun, 12 Oct 2003 08:32:09 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0618_01C3909B.53CA3FC0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 5.50.4133.2400 X-MIMEOLE: Produced By Microsoft MimeOLE V5.50.4133.2400 This is a multi-part message in MIME format. ------=_NextPart_000_0618_01C3909B.53CA3FC0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Todd, The oil pump is a positive displacement pump, and flow will be = proportional to rpm. Does your oil cooler have a thermostat? I agree that it sounds like you have local boiling when the flow is low = and the power increases rapidly. Bill I don't have a OAT sensor on my plane but the ground temp was 9C. = I took it up to 13000, where it should have been ~ -17C. Oddly enough I = seem to have a constant 20C delta T on the coolant but the oil delta T = will vary between 5 and 20 degrees depending on power load. The = temperature controller works very well to keep the temp at 85C except = during a full power climb where it will gradually close on 100C even = pumping full speed. I also don't have fuel flow right now, but I hope to = both and much more as soon as the EM2 is available. I have a switch which allows me to bypass the controller and apply = buss power directly to the pump. While doing circuits I was closely = watching the cooling temp/press/flow. During descent all three would = decrease and the pump would flow minimum coolant as it tried to maintain = temp, however what concerned me was that I'd touch down then apply full = power for a climb out, I'd see a sudden spike in the pressure, followed = a few seconds later by a temp increase and an immediate increase in flow = rate. This indicates (to me) possible localized boiling in the block for = a few seconds until the flow increases again, reducing the pressure. For = this reason I've taken to switching the pump to bypass the controller = while practicing touch & goes. ------=_NextPart_000_0618_01C3909B.53CA3FC0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Todd,

The oil pump is a positive displacement = pump, and=20 flow will be proportional to rpm. Does your oil cooler have a=20 thermostat?

I agree that it sounds like you have = local boiling=20 when the flow is low and the power increases rapidly.

Bill

I don't have a OAT sensor = on my plane=20 but the ground temp was 9C. I took it up to 13000, where it should = have been ~=20 -17C. Oddly enough I seem to have a constant 20C delta T on the = coolant but=20 the oil delta T will vary between 5 and 20 degrees depending on power = load.=20 The temperature controller works very well to keep the temp at 85C = except=20 during a full power climb where it will gradually close on 100C even = pumping=20 full speed. I also don't have fuel flow right now, but I hope to both = and much=20 more as soon as the EM2 is available.

I have a switch which allows me to bypass the = controller=20 and apply buss power directly to the pump. While doing circuits I was = closely=20 watching the cooling temp/press/flow. During descent all three would = decrease=20 and the pump would flow minimum coolant as it tried to maintain temp, = however=20 what concerned me was that I'd touch down then apply full power for a = climb=20 out, I'd see a sudden spike in the pressure, followed a few seconds = later by a=20 temp increase and an immediate increase in flow rate. This indicates = (to me)=20 possible localized boiling in the block for a few seconds until the = flow=20 increases again, reducing the pressure. For this reason I've taken to=20 switching the pump to bypass the controller while practicing touch = &=20 goes.

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