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Return-Path: <13brv3@bellsouth.net> Received: from imf21aec.mail.bellsouth.net ([205.152.59.69] verified) by logan.com (CommuniGate Pro SMTP 4.1.6) with ESMTP id 2706168 for flyrotary@lancaironline.net; Sat, 01 Nov 2003 19:23:40 -0500 Received: from rad ([68.212.11.237]) by imf21aec.mail.bellsouth.net (InterMail vM.5.01.05.27 201-253-122-126-127-20021220) with ESMTP id <20031102002311.PZWH1847.imf21aec.mail.bellsouth.net@rad> for ; Sat, 1 Nov 2003 19:23:11 -0500 From: "Russell Duffy" <13brv3@bellsouth.net> To: "Flyrotary List" Subject: radiator at cowl outlet? Date: Sat, 1 Nov 2003 18:23:12 -0600 Message-ID: <000001c3a0d7$803d0000$6001a8c0@rad> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0001_01C3A0A5.35A29000" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.4510 Importance: Normal X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1165 This is a multi-part message in MIME format. ------=_NextPart_000_0001_01C3A0A5.35A29000 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Greetings, =20 I flew again today, and ended up proving that my cowl cheek exits alone = (66 sq in) will not be enough for climb, though they may well be enough for cruise. To add a cowl flap on the bottom, I'd have to leave the = radiator low, like it is now, in order to get enough space over the top of the radiator for an exit. Of course, this is horrible, since air is coming = in the radiator, and out the exit right next to it. There has to be a = better way. =20 =20 Has anyone here put their radiator and oil cooler at the air exit of the cowl? I know Powersports did this, as well as Atkins I think. This = would be the absolute simplest solution to my problems, if it works. The new = cowl already has two beautiful 24 sq in inlets on the front. The radiator = and oil cooler could be moved up to the bottom of the engine mount, making = them fit completely inside the bottom of the new cowl. The cowl cheeks could = be closed up, and faired as Van intended. All I would have to do is make a large adjustable exit scoop for the bottom of the radiator. In cruise, = this would end up being closed to the point where it would almost be the same = as the stock cowl. In climb, the scoop would be opened quite a bit more to help airflow. The beauty of this is that the extra drag would only be around during climb, at relatively low airspeeds. =20 =20 Now of course the problem is the engine and turbo heating the air prior = to having it get to the oil cooler, then radiator. I just have no idea how much it would be heated though. Can anyone take a swag about how much = of a problem this would be? In other words, how much would the air get = heated? I REALLY could use the new... you-know-what to measure some temps. Is = it November yet :-) I could measure the air coming out of the back of the radiator/oil cooler now, then measure what comes out of the cowl. That would give me some idea how much heat is getting added by air flowing = over the engine/turbo. =20 =20 In other news, I'm hearing some second hand whining from some of the = guys at the airport. They claim that my plane is loud, and annoying, though no = one has really complained. I had an RV-8 buddy of mine listen today as I = flew around, and he said he didn't see any problem at all. He thinks it = isn't really any louder than the lycomings, but that it's a much different = sound (of course). He said it sounded like a large RC pattern plane with a = tuned pipe. BTW, I'm tired of flying around the airport area. Tomorrow, I = fly to the beach :-) =20 Cheers, Rusty (hoping for an early Christmas present from Tracy)=20 ------=_NextPart_000_0001_01C3A0A5.35A29000 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message

Greetings,

I flew again = today,=20 and ended up proving that my cowl cheek exits alone (66 sq in) will = not be=20 enough for climb, though they may well be enough for cruise. To = add a cowl=20 flap on the bottom, I'd have to leave the radiator low, like it is now, = in order=20 to get enough space over the top of the radiator for an exit. Of = course,=20 this is horrible, since air is coming in the radiator, and out the exit = right=20 next to it. There has to be a better way. =

Has anyone here = put their=20 radiator and oil cooler at the air exit of the cowl? I know = Powersports=20 did this, as well as Atkins I think. This would be the = absolute=20 simplest solution to my problems, if it works. The new cowl = already has=20 two beautiful 24 sq in inlets on the front. The radiator = and oil=20 cooler could be moved up to the bottom of the engine mount, making = them fit=20 completely inside the bottom of the new cowl. The cowl cheeks = could=20 be closed up, and faired as Van intended. All I would have to do = is make a=20 large adjustable exit scoop for the bottom of the radiator. = In=20 cruise, this would end up being closed to the point where it would = almost=20 be the same as the stock cowl. In climb, the scoop would = be=20 opened quite a bit more to help airflow. The beauty of this is = that the=20 extra drag would only be around during climb, at relatively low=20 airspeeds.

Now of course = the problem=20 is the engine and turbo heating the air prior to having it get to the = oil=20 cooler, then radiator. I just have no idea how much it would be = heated=20 though. Can anyone take a swag about how much of a = problem this would=20 be? In other words, how much would the air get heated? = I REALLY=20 could use the new... you-know-what to measure some = temps. Is it=20 November yet :-) I could measure the air coming out of the back of = the radiator/oil cooler now, then measure what comes out of the = cowl. =20 That would give me some idea how much heat is getting added by air = flowing over=20 the engine/turbo.

In other news, = I'm hearing=20 some second hand whining from some of the guys at the airport. = They claim=20 that my plane is loud, and annoying, though no one has really = complained. =20 I had an RV-8 buddy of mine listen today as I flew around, and he said = he didn't=20 see any problem at all. He thinks it isn't really any louder than = the=20 lycomings, but that it's a much different sound (of course). He = said it=20 sounded like a large RC pattern plane with a tuned = pipe. BTW,=20 I'm tired of flying around the airport area. Tomorrow, I = fly to=20 the beach :-)

Cheers,

Rusty (hoping = for an early=20 Christmas present from Tracy)

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