Return-Path: Received: from fed1rmmtao02.cox.net ([68.230.241.37] verified) by logan.com (CommuniGate Pro SMTP 4.2b5) with ESMTP id 142060 for flyrotary@lancaironline.net; Sun, 06 Jun 2004 18:59:34 -0400 Received: from BigAl ([68.107.116.221]) by fed1rmmtao02.cox.net (InterMail vM.6.01.03.02 201-2131-111-104-20040324) with ESMTP id <20040606225902.RAIH7173.fed1rmmtao02.cox.net@BigAl> for ; Sun, 6 Jun 2004 18:59:02 -0400 From: "Al Gietzen" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] opinion Date: Sun, 6 Jun 2004 15:59:04 -0700 Message-ID: <000e01c44c19$dd695e20$6400a8c0@BigAl> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_000F_01C44BDF.310A8620" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1165 This is a multi-part message in MIME format. ------=_NextPart_000_000F_01C44BDF.310A8620 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable =20 =20 -----Original Message----- From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Steve Brooks Sent: Sunday, June 06, 2004 2:11 PM To: Rotary motors in aircraft Subject: [FlyRotary] opinion =20 Ed,]I wanted to get your opinion about increasing the size of my cooling scoop. The existing scoop is a NACA scoop upon which I extended the = scoop portion a little e bit to try to capture more air. I took some = measurements today, and the inside of the scoop measures 1-3/4" high by 15-3/4" wide. Now there is an additional area that same size which is recessed that is = the actual NACA inlet. I'm not sure about how to calculate the inlet size, = but if you exclude the NACA, it is about 27.5 SQ IN, and if you include the = NACA area, about 55 SQ IN. =20 I am looking at building a scoop on the landing gear cover which extends = 9" forward of the current scoop. I am looking at making the width of the = scoop 21-3/4 inches, which is 3" wider on each side, and 1-5/8" taller (or = deeper depending on how you look at it). That would make the inlet size 73.4 = SQ IN. There is also the actual NACA inlet along that area that tapers = toward the front. I don't know what the SQ IN of the NACA is on the cover, but = I could make some more measurements and calculate it if you think that it would be significant. =20 I am interested in your feedback about the size, or from anyone else for that matter. Today when flying straight and level, when I increased throttle, and increased speed, I also increased in oil and coolant temperature, which tells me that I don't have enough air flow, or = velocity, or pressure, or whatever the correct term is. =20 Thanks, =20 Steve Brooks =20 -Steve; =20 I haven't taken the time to review the details of your plan; but = remember rule one - the smallest cross-sectional area of the scoop should be at = the entrance. Some rounding at the entrance edge is good, and an airfoil = shape of the entrance edge (bottom of the airfoil toward the inside of the = scoop) is even better. =20 FWIW, =20 Al ------=_NextPart_000_000F_01C44BDF.310A8620 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

-----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On = Behalf Of Steve Brooks
Sent: Sunday, June 06, 2004 2:11 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] opinion

Ed,]I wanted to get your opinion about increasing the size of my = cooling

scoop. The existing scoop is a NACA scoop upon which I extended the = scoop

portion a little e bit to try to capture more air. I took some = measurements

today, and the inside of the scoop measures 1-3/4" high by 15-3/4" = wide.

Now there is an additional area that same size which is recessed that is = the

actual NACA inlet. I'm not sure about how to calculate the inlet size, = but

if you exclude the NACA, it is about 27.5 SQ IN, and if you include the = NACA

area, about 55 SQ IN.

I am looking at building a scoop on the landing gear cover which extends = 9"

forward of the current scoop. I am looking at making the width of the = scoop

21-3/4 inches, which is 3" wider on each side, and 1-5/8" taller (or = deeper

depending on how you look at it). That would make the inlet size 73.4 = SQ

IN. There is also the actual NACA inlet along that area that tapers = toward

the front. I don't know what the SQ IN of the NACA is on the cover, = but I

could make some more measurements and calculate it if you think that = it

would be significant.

I am interested in your feedback about the size, or from anyone else = for

that matter. Today when flying straight and level, when I = increased

throttle, and increased speed, I also increased in oil and = coolant

temperature, which tells me that I don't have enough air flow, or = velocity,

or pressure, or whatever the correct term is.

Thanks,

Steve Brooks

-Steve;

<= /font>

I = haven’t taken the time to review the details of your plan; but remember rule one = – the smallest cross-sectional area of the scoop should be at the entrance. Some rounding at the entrance edge is good, and an airfoil shape of the = entrance edge (bottom of the airfoil toward the inside of the scoop) is even = better.

<= /font>

FWIW,

<= /font>

Al

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