X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from willowsprings.uwyo.edu ([129.72.10.31] verified) by logan.com (CommuniGate Pro SMTP 6.0c2) with ESMTPS id 5804060 for flyrotary@lancaironline.net; Wed, 10 Oct 2012 01:32:45 -0400 Received-SPF: none receiver=logan.com; client-ip=129.72.10.31; envelope-from=SBoese@uwyo.edu Received: from ponyexpress-ht4.uwyo.edu (extlb.uwyo.edu [172.26.4.4]) by willowsprings.uwyo.edu (8.14.4/8.14.4) with ESMTP id q9A5W7bQ016941 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=FAIL) for ; Tue, 9 Oct 2012 23:32:07 -0600 (MDT) (envelope-from SBoese@uwyo.edu) Received: from ponyexpress-m10.uwyo.edu ([fe80::60dd:cb9e:6f71:3d48]) by ponyexpress-ht4.uwyo.edu ([fe80::8de7:b225:a85b:d0ee%13]) with mapi id 14.02.0318.001; Tue, 9 Oct 2012 23:32:06 -0600 From: "Steven W. Boese" To: Rotary motors in aircraft Subject: RE: [FlyRotary] Re: cooling airflow concepts Thread-Topic: [FlyRotary] Re: cooling airflow concepts Thread-Index: AQHNpn/amxUeleG3L0eSpgcEXecrWJeyAgn9 Date: Wed, 10 Oct 2012 05:32:06 +0000 Message-ID: <3E8191F276108F4481AB0721BBA9269E05DE3F25@ponyexpress-m10.uwyo.edu> References: In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [75.228.138.79] Content-Type: multipart/alternative; boundary="_000_3E8191F276108F4481AB0721BBA9269E05DE3F25ponyexpressm10u_" MIME-Version: 1.0 --_000_3E8191F276108F4481AB0721BBA9269E05DE3F25ponyexpressm10u_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Steve, I am not the right person to try to answer your question. Having retained = the stock Van's cooling inlets for the coolant exchangers with essentially = no diffusers, the result appears to be marginal cooling and high drag. So = I am asking myself the exact same question. Steve Boese RV6A, 1986 13B NA, RD1A, EC2 ________________________________ From: Rotary motors in aircraft [flyrotary@lancaironline.net] on behalf of = Stephen Izett [steveizett@me.com] Sent: Tuesday, October 09, 2012 6:39 PM To: Rotary motors in aircraft Subject: [FlyRotary] Re: cooling airflow concepts Thanks again Steve My current snout looks similar to the attached image. I'm considering going to the trouble of reworking the cowl into two circula= r duct openings, keeping them as far from the centre of the prop as possibl= e. Current opening is approx 7'' x 3'' - 21sqin. Tracy I believe uses (Water Side) 5 1/4" so - 21sqin. Multiply Tracy's by 2/3 (loose a rotor) + a bit for the extra side exhaust = energy (Renesis) going into the coolant - say 15sqin's or 4 1/2 inch diamet= er. The other attached photos are modified Glasair snouts What do you think I should consider given the amount of work involved and t= he possible improvement factored in? Cheers Steve Izett --_000_3E8191F276108F4481AB0721BBA9269E05DE3F25ponyexpressm10u_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Steve,

I am not the right person to try to answer your question. Having r= etained the stock Van's cooling inlets for the coolant exchangers with esse= ntially no diffusers, the result appears to be marginal cooling and hi= gh drag. So I am asking myself the exact same question.

Steve = Boese

RV6A, 1986 13B NA, RD1A, EC2

From: Rotary motors in aircraft [flyrotary= @lancaironline.net] on behalf of Stephen Izett [steveizett@me.com]
Sent: Tuesday, October 09, 2012 6:39 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: cooling airflow concepts

Thanks again Steve

My current snout looks similar to the attached image.

I'm considering going to the trouble of reworking the cowl into two ci= rcular duct openings, keeping them as far from the centre of the prop as po= ssible.

Current opening is approx 7'' x 3'' - 21sqin.

Tracy I believe uses (Water Side) 5 1/4" so - 21sqin.

Multiply Tracy's by 2/3 (loose a rotor) + a bit for the extra side= exhaust energy (Renesis) going into the coolant - say 15sqin's or 4 1/2 in= ch diameter.

The other attached photos are modified Glasair snouts

What do you think I should consider given the amount of work involved = and the possible improvement factored in?

Cheers

Steve Izett

--_000_3E8191F276108F4481AB0721BBA9269E05DE3F25ponyexpressm10u_--