X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from nk11p08mm-asmtp003.mac.com ([17.158.58.248] verified) by logan.com (CommuniGate Pro SMTP 6.0c2) with ESMTP id 5804064 for flyrotary@lancaironline.net; Wed, 10 Oct 2012 01:45:58 -0400 Received-SPF: pass receiver=logan.com; client-ip=17.158.58.248; envelope-from=steveizett@me.com MIME-version: 1.0 Content-type: multipart/alternative; boundary="Boundary_(ID_dnXh7p5r7P5mIRjask4wOg)" Received: from [10.1.1.6] (58-7-133-152.dyn.iinet.net.au [58.7.133.152]) by nk11p08mm-asmtp003.mac.com (Oracle Communications Messaging Server 7u4-24.01(7.0.4.24.0) 64bit (built Jan 3 2012)) with ESMTPSA id <0MBN002NZXBHJS80@nk11p08mm-asmtp003.mac.com> for flyrotary@lancaironline.net; Wed, 10 Oct 2012 05:45:23 +0000 (GMT) X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:5.7.7855,1.0.431,0.0.0000 definitions=2012-10-10_02:2012-10-10,2012-10-10,1970-01-01 signatures=0 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 spamscore=0 ipscore=0 suspectscore=0 phishscore=0 bulkscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=6.0.2-1203120001 definitions=main-1210090442 From: Stephen Izett Subject: Re: [FlyRotary] Re: cooling airflow concepts Date: Wed, 10 Oct 2012 13:45:17 +0800 In-reply-to: To: Rotary motors in aircraft References: Message-id: X-Mailer: Apple Mail (2.1278) --Boundary_(ID_dnXh7p5r7P5mIRjask4wOg) Content-type: text/plain; CHARSET=US-ASCII Content-transfer-encoding: 7BIT Thanks Steve I wonder if Tracy is lurking and can comment on the value of reworking the cowl inlets? Cheers Steve Izett On 10/10/2012, at 1:32 PM, Steven W. Boese wrote: > 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 circular duct openings, keeping them as far from the centre of the prop as possible. > 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 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 --Boundary_(ID_dnXh7p5r7P5mIRjask4wOg) Content-type: text/html; CHARSET=US-ASCII Content-transfer-encoding: quoted-printable Thanks Steve

I wonder if Tracy is lurking and = can comment on the value of reworking the cowl = inlets?

Cheers

Steve = Izett

On 10/10/2012, at 1:32 PM, Steven W. Boese = wrote:

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 circular duct openings, keeping them as far from the = centre of the prop as possible.
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 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

= --Boundary_(ID_dnXh7p5r7P5mIRjask4wOg)--