Return-Path: Received: from fed1mtao06.cox.net ([68.6.19.125] verified) by logan.com (CommuniGate Pro SMTP 4.1.8) with ESMTP id 2961502 for flyrotary@lancaironline.net; Sun, 01 Feb 2004 15:23:18 -0500 Received: from BigAl ([68.107.116.221]) by fed1mtao06.cox.net (InterMail vM.5.01.06.05 201-253-122-130-105-20030824) with ESMTP id <20040201202316.STRA2425.fed1mtao06.cox.net@BigAl> for ; Sun, 1 Feb 2004 15:23:16 -0500 From: "Al Gietzen" To: "'Rotary motors in aircraft'" Subject: air flow, induction air scoop Date: Sun, 1 Feb 2004 12:23:23 -0800 Message-ID: <000f01c3e901$3de36e20$6400a8c0@BigAl> MIME-Version: 1.0 Content-Type: multipart/mixed; boundary="----=_NextPart_000_0010_01C3E8BE.2FC02E20" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.4024 In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1165 Importance: Normal This is a multi-part message in MIME format. ------=_NextPart_000_0010_01C3E8BE.2FC02E20 Content-Type: multipart/alternative; boundary="----=_NextPart_001_0011_01C3E8BE.2FC02E20" ------=_NextPart_001_0011_01C3E8BE.2FC02E20 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable =20 Subject: [FlyRotary] Re: air flow =20 =20 Here is a formula 80 CID * RPM/1728. Example for 6000 rpm, 80*6000 rpm/1728 =3D 277.77 Cubic Feet of air per minute. A cubic foot of air = (at sea level standard day) is approx 0.076 lbm/cubic foot so 277.77*0.076 =3D 21.11 lbm/min air mass at 6000 rpm . Just change the rpm to what ever value you want. Also note the weight of air of course decreases with altitude so 277.77 CFM provides 21.11 lbm/minute at sea level but less at altitude. =20 Note this assumes 100 % Volumetric efficiency. =20 Ed Anderson =20 Oh; boy, now you=92ve done it. My beautiful intake scoop is already installed, and I apparently designed it based on the wrong number. =20 You=92re numbers look right to me. I=92ll have see if I can figure out = what I did. =20 Thanks. =20 Al =20 Your Welcome, Al =20 Perhaps you used the correct number for the design and just had a brain fade when you quoted the number for CFM - Hopefully? =20 Ed Anderson =20 Ed: Well, it seems that I did use my number (275 cfm) and then computed a scoop inlet area of 3.9 sq. in. based on an airspeed of 100 mph (steep climb). When I fabricated it, I made a little larger so it would be less restrictive for low speed. Yesterday I made a more accurate measurement of the opening, and found it to be 5 =BC sq in. Assuming everything is ideal, this would be about right for zero ram pressure at about 130 mph, which is close to my typical climb speed. At typical cruise of 200 mph at say 8000 ft, I should have same ram pressure for a little better cruise efficiency. So all that is fine. =20 There is always the trade off of a scoop that is not restrictive on the takeoff roll, and one that gives you some ram air advantage without much drag at high speed. I am considering a small, weighted trapdoor in the bottom of the intake duct inside the cowl that will open and allow more air in when the pressure in the duct is less than ambient, and closes when the pressure is more than ambient. =20 Al =20 =20 ------=_NextPart_001_0011_01C3E8BE.2FC02E20 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

 

=

Subject: [FlyRotary] Re: air flow

 

 

 Here is a formula   80 CID * RPM/1728.  Example for 6000 rpm,  80*6000

rpm/1728 =3D 277.77 Cubic Feet of air per = minute.  A cubic foot of air (at sea

level standard day) is approx 0.076 lbm/cubic foot   so 277.77*0.076 =3D 21.11

lbm/min air mass at 6000 rpm .  Just = change the rpm to what ever value you

want.  Also note the weight of air of = course decreases with altitude so

277.77 CFM provides 21.11 lbm/minute at sea = level but less at altitude.

 

Note this assumes 100 % Volumetric = efficiency.

 

Ed Anderson

 

Oh; boy, now you’ve done it.  My beautiful intake scoop is = already installed, and I apparently designed it based on the wrong = number.

 

You’re numbers look right to me.  I’ll have see if I can figure out = what I did.

 

Thanks.=

 

Al

 

Your Welcome, Al

 

  &n= bsp; Perhaps you used the correct number for the design and just had a brain = fade when you quoted the number for CFM - Hopefully?

 

Ed Anderson

 

Ed:

Well, it seems = that I did use my number (275 cfm) and then computed a scoop inlet area of 3.9 = sq. in. based on an airspeed of 100 mph (steep climb).=A0 When I fabricated it, = I made a little larger so it would be less restrictive for low speed. = =A0Yesterday I made a more accurate measurement of the opening, and found it to be 5 =BC sq = in.=A0 Assuming everything is ideal, this would be about right for zero ram pressure at = about 130 mph, which is close to my typical climb speed. =A0At typical cruise of = 200 mph at say 8000 ft, I should have same ram pressure for a little better cruise efficiency.=A0 So all that is fine.

 

There is = always the trade off of a scoop that is not restrictive on the takeoff roll, and = one that gives you some ram air advantage without much drag at high speed.=A0 I = am considering a small, weighted trapdoor in the bottom of the intake duct inside the = cowl that will open and allow more air in when the pressure in the duct is = less than ambient, and closes when the pressure is more than = ambient.

 

Al

 

 

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