Return-Path: Received: from fed1mtao05.cox.net ([68.6.19.126] verified) by logan.com (CommuniGate Pro SMTP 4.2b1) with ESMTP id 3139825 for flyrotary@lancaironline.net; Thu, 01 Apr 2004 01:06:58 -0500 Received: from BigAl ([68.107.116.221]) by fed1mtao05.cox.net (InterMail vM.5.01.06.08 201-253-122-130-108-20031117) with ESMTP id <20040401060655.UTH2451.fed1mtao05.cox.net@BigAl> for ; Thu, 1 Apr 2004 01:06:55 -0500 From: "Al Gietzen" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Requesting more thoughts on cooling Date: Wed, 31 Mar 2004 22:07:12 -0800 Message-ID: <004601c417af$93355c80$6400a8c0@BigAl> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0047_01C4176C.85121C80" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1165 Importance: Normal In-Reply-To: This is a multi-part message in MIME format. ------=_NextPart_000_0047_01C4176C.85121C80 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable John;=20 =20 It doesn=92t surprise me a bit that your temps are running up doing what you=92re doing. I don=92t recall your configuration, and whether you get = any significant natural convection cooling. I=92m surprised that your oil = temp didn=92t go higher. With our props in back the best we can hope to do = is to be able to do low speed taxi and idle without overheating. It=92s all = about airflow at liftoff speed and above. =20 If you chose to remove the thermostat you should be able to tap out the = hole with =BD NPT and put in a plug. Put grease in the flutes of the tap to = keep the turnings from getting in the cooling system. Change out the grease after about three full turns or so. =20 Best of luck, =20 Al=20 =20 -----Original Message----- From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of John Slade Sent: Wednesday, March 31, 2004 5:34 PM To: Rotary motors in aircraft Subject: [FlyRotary] Requesting more thoughts on cooling =20 Guys, I'm signed off and ready to fly, but I'm a little concerned about = cooling issues. I don't want to melt anything in the first go around the = pattern. =20 I'm finding that the engine gets REALLY hot after about 10 - 15 minutes ground running, and I'm wondering if that's to be expected, or if I have = a cooling problem. Maybe I should just taxi gently to the runway and = launch to get airflow as soon as possible. =20 For example, today I ran it up and down the taxiway for a few minutes at fairly low speeds and around 2500 - 3000rpm. Then I did some static = runups (maybe 3800 - 4000 rpm - all the brakes will hold) and some EC2 tuning. = Then I did some mode 1 programing at various rpm. During this run I watched = the water temp gradually go up until it was over 200 and I shut her down. = The oil was still down around 140 - 160. I took the cowl off and found that everything in the engine compartment was HOT. Radiator, oil coolers, = hoses, intake, the cowl itself. Apart from giving my cowl a REAL GOOD post cure = I dont think I've done any damage, but this doesnt give me a lot of = confidence about whether I'll make it around the pattern. =20 The thermostat is now in place, and I get the feeling that I'd be much better without it. Once the engine gets a little hot the water temps = seem to "run away" if I'm producing any kind of power. So... to remove the thermostat [3rd gen rew engine] I have to remove the water pump and have = the by-pass hole welded shut - right? =20 Do you 13B drivers tend to just taxi out at low rpm then launch? Would = your engine overheat if you did a 15 minute medium power runup? I'd = appreciate any general thoughts, or comments on how much ground running I should = expect to get away with before the temps get too high. Anything else I should check? =20 Regards, John Slade =20 =20 =20 =20 =20 =20 =20 ------=_NextPart_000_0047_01C4176C.85121C80 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Message

John;

 

It doesn’t surprise me a = bit that your temps are running up doing what you’re doing. I don’t = recall your configuration, and whether you get any significant natural = convection cooling. =A0I’m surprised that your oil temp didn’t go = higher. =A0With our props in back the best we can hope to do is to be able to do low = speed taxi and idle without overheating.=A0 It’s all about airflow at liftoff = speed and above.

 

If you chose to remove the = thermostat you should be able to tap out the hole with =BD NPT and put in a = plug.=A0 Put grease in the flutes of the tap to keep the turnings from getting in the cooling system.=A0 Change out the grease after about three full turns or = so.

 

Best of luck,

 

Al

 

-----Origi= nal Message-----
From: Rotary motors in = aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of John Slade
Sent: Wednesday, March = 31, 2004 5:34 PM
To: Rotary motors in = aircraft
Subject: [FlyRotary] = Requesting more thoughts on cooling

 

Guys,

I'm signed off = and ready to fly, but I'm a little concerned about cooling issues. I don't want to = melt anything in the first go around the pattern.

 

I'm finding that = the engine gets REALLY hot after about 10 - 15 minutes ground running, and = I'm wondering if that's to be expected, or if I have a cooling = problem.  Maybe I should just taxi gently to the runway and launch to get airflow as = soon as possible.

 

For example, = today I ran it up and down the taxiway for a few minutes at fairly low speeds and = around 2500 - 3000rpm. Then I did some static runups (maybe 3800 - 4000 rpm - = all the brakes will hold) and some EC2 tuning. Then I did some mode 1 = programing at various rpm. During this run I watched the water temp = gradually go up until it was over 200 and I shut her down. The oil was still = down around 140 - 160. I took the cowl off and found that everything in the = engine compartment was HOT. Radiator, oil coolers, hoses, intake, the cowl = itself. Apart from giving my cowl a REAL GOOD post cure I dont think I've done = any damage, but this doesnt give me a lot of confidence about whether I'll = make it around the pattern.

 

The thermostat = is now in place, and I get the feeling that I'd be much better without it. Once = the engine gets a little hot the water temps seem to "run away" if = I'm producing any kind of power. So... to remove the thermostat [3rd gen rew engine] I have to remove the water pump and have the by-pass hole welded = shut - right?

 

Do you 13B = drivers tend to just taxi out at low rpm then launch? Would your engine overheat if = you did a 15 minute medium power runup? I'd appreciate any general thoughts, or comments on how much ground running I should expect to get away with = before the temps get too high. Anything else I should check?

 

Regards,

John = Slade

 

 

 

 

 

 

 

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