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Message-ID: <000d01c5447b$081e8050$2402a8c0@edward2>
From: "Ed Anderson" <eanderson@carolina.rr.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
References: <list-882877@logan.com>
Subject: Re: [FlyRotary] Re: Area calcuation for Cone air filters was [FlyRotary] Re: Air filters
Date: Mon, 18 Apr 2005 20:59:24 -0400
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Excellent point, Jerry.  You are correct, completely left out the =
accordion pleat folding.  So let me go back and add a big fudge factor =
to the equation in the spread sheet.

Ed
  ----- Original Message -----=20
  From: Jerry Hey=20
  To: Rotary motors in aircraft=20
  Sent: Monday, April 18, 2005 8:47 PM
  Subject: [FlyRotary] Re: Area calcuation for Cone air filters was =
[FlyRotary] Re: Air filters


  Ed, the surface area of the filter is much greater than its =
circumference x height due to the folding of the element. I just checked =
mine and each inch equals 4 inches if stretched out. Thus the surface =
area on my 5.5 in. round x 5 inch high filter would be over 300 sq. in. =
Jerry




  On Monday, April 18, 2005, at 07:00 PM, Ed Anderson wrote:


    Bill,
    =20
    I did some research on the K&N site - they have a formula for =
determining filter area needed - the trouble is there is no correlation =
(I could find) between the area you calculate and the surface area of =
their filters.  So I just did a rough calculation of their filters =
surface area based on small end - large end and length. On their double =
cone types I assume the inner cone is only 10% the area of their outer =
cone (which is probably very conservative).  I used the 160 CID 4 stroke =
equivalent displacement area for the 13B and the below formula.  Which =
gave me at 7000 rpm a minimum of 53 sq inches required.
    =20
    Then I did the calculation using the attached spreadsheet to compare =
their different size filters for area - since they don't give it.  =
Attached is the spreadsheet for using the below formula and the =
calculations for a truncated cone surface area.
    =20
    =20

    Use the formula below to compute the minimum size filter required =
for your particular application. The usable portion of the filter is =
called the EFFECTIVE FILTERING AREA which is determined by multiplying =
the diameter of the filter times Pi (3.1416) times the height of the air =
filter in inches, then subtracting .75-inch. We subtract .75-inch to =
compensate for the rubber seals on each end of the element and the =
filter material near them since very little air flows through this area.


  <image.tiff>



  <image.tiff>




    Ed A
    =20
    =20
    =20
    =20
    ----- Original Message -----
    From: William
    To: Rotary motors in aircraft
    Sent: Monday, April 18, 2005 5:54 PM
    Subject: [FlyRotary] Re: Air filters

    If one looks at the K&N cone filters, how big a one is required?
    Bill Schertz (really tight under my cowl)
    KIS Cruiser # 4045

    =20

    <affform1.gif><affform2.gif><Filter Size Cone.xls> Homepage: =
http://www.flyrotary.com/

        Archive: http://lancaironline.net/lists/flyrotary/List.html

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=3DContent-Type content=3D"text/html; =
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<BODY bgColor=3D#ffffff>
<DIV><FONT face=3DArial size=3D2>Excellent point, Jerry.&nbsp; You are =
correct,=20
completely left out the accordion pleat folding.&nbsp; So let me go back =
and add=20
a big fudge factor to the equation in the spread sheet.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>Ed</FONT></DIV>
<BLOCKQUOTE dir=3Dltr=20
style=3D"PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; =
BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
  <DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV>
  <DIV=20
  style=3D"BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: =
black"><B>From:</B>=20
  <A title=3Djerryhey@earthlink.net =
href=3D"mailto:jerryhey@earthlink.net">Jerry=20
  Hey</A> </DIV>
  <DIV style=3D"FONT: 10pt arial"><B>To:</B> <A =
title=3Dflyrotary@lancaironline.net=20
  href=3D"mailto:flyrotary@lancaironline.net">Rotary motors in =
aircraft</A> </DIV>
  <DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Monday, April 18, 2005 =
8:47=20
PM</DIV>
  <DIV style=3D"FONT: 10pt arial"><B>Subject:</B> [FlyRotary] Re: Area =
calcuation=20
  for Cone air filters was [FlyRotary] Re: Air filters</DIV>
  <DIV><BR></DIV>Ed, the surface area of the filter is much greater than =
its=20
  circumference x height due to the folding of the element. I just =
checked mine=20
  and each inch equals 4 inches if stretched out. Thus the surface area =
on my=20
  5.5 in. round x 5 inch high filter would be over 300 sq. in.=20
  Jerry<BR><BR><BR><BR><BR>On Monday, April 18, 2005, at 07:00 PM, Ed =
Anderson=20
  wrote:<BR><BR>
  <BLOCKQUOTE><?fontfamily><?param =
Arial><?smaller>Bill,<?/smaller><?/fontfamily><BR>&nbsp;<BR><?fontfamily>=
<?param Arial><?smaller>I=20
    did some research on the K&amp;N site - they have a formula for =
determining=20
    filter area needed - the trouble is there is no correlation (I could =
find)=20
    between the area you calculate and the surface area of their =
filters.&nbsp;=20
    So I just did a rough calculation of their filters surface area =
based on=20
    small end - large end and length.&nbsp;On their double cone types I =
assume=20
    the inner cone is only&nbsp;10% the area of their outer cone (which =
is=20
    probably very conservative).&nbsp; I used the 160 CID 4 stroke =
equivalent=20
    displacement area for the 13B and the below formula.&nbsp; Which =
gave me at=20
    7000 rpm a minimum of 53 sq inches=20
    required.<?/smaller><?/fontfamily><BR>&nbsp;<BR><?fontfamily><?param =
Arial><?smaller>Then=20
    I did the calculation using the attached spreadsheet to compare =
their=20
    different size filters for area - since they don't give it.&nbsp; =
Attached=20
    is the spreadsheet for using the below formula and the calculations =
for a=20
    truncated cone surface =
area.<?/smaller><?/fontfamily><BR>&nbsp;<BR><?fontfamily><?param =
Arial><?smaller>&nbsp;<BR><BR><?/smaller>Use=20
    the formula below to compute the minimum size filter required for =
your=20
    particular application. The usable portion of the filter is called =
the=20
    EFFECTIVE FILTERING AREA which is determined by multiplying the =
diameter of=20
    the filter times Pi (3.1416) times the height of the air filter in =
inches,=20
    then subtracting .75-inch. We subtract .75-inch to compensate for =
the rubber=20
    seals on each end of the element and the filter material near them =
since=20
    very little air flows through this =
area.<?smaller><BR><BR><?/smaller><?/fontfamily></BLOCKQUOTE><?fontfamily=
><?param =
Arial><?smaller>&lt;image.tiff&gt;<?/smaller><?/fontfamily><BR><?center>
  <BLOCKQUOTE><?fontfamily><?param =
Arial><?smaller><BR><?/smaller><?/fontfamily></BLOCKQUOTE><?/center><?fon=
tfamily><?param =
Arial><?smaller>&lt;image.tiff&gt;<?/smaller><?/fontfamily><BR><?center>
  <BLOCKQUOTE><?fontfamily><?param =
Arial><?smaller><BR><?/smaller><?/fontfamily></BLOCKQUOTE><?/center>
  <BLOCKQUOTE><BR>Ed A<BR>&nbsp;<BR>&nbsp;<BR>&nbsp;<BR>&nbsp;<BR>-----=20
    Original Message -----<BR><B>From:</B>=20
    <U><?color><?param 0000,0000,FFFF>William<?/color></U><BR><B>To:</B> =
<U><?color><?param 0000,0000,FFFF>Rotary motors in=20
    aircraft<?/color></U><BR><B>Sent:</B> Monday, April 18, 2005 5:54=20
    PM<BR><B>Subject:</B> [FlyRotary] Re: Air =
filters<BR><BR><?fontfamily><?param Arial><?smaller>If one looks at the=20
    K&amp;N cone filters, how big a one is=20
    required?<?/smaller><?/fontfamily><BR>Bill Schertz (really tight =
under my=20
    cowl)<BR>KIS Cruiser #=20
    =
4045<BR><BR>&nbsp;<BR><BR>&lt;affform1.gif&gt;&lt;affform2.gif&gt;&lt;Fil=
ter=20
    Size Cone.xls&gt; Homepage: http://www.flyrotary.com/<BR>
    <BLOCKQUOTE>
      <BLOCKQUOTE>Archive:=20
        =
http://lancaironline.net/lists/flyrotary/List.html<BR></BLOCKQUOTE></BLOC=
KQUOTE></BLOCKQUOTE></BLOCKQUOTE></BODY></HTML>

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