DIYAPASON-L Digest #723 - Sunday, January 12, 2003
 
diameter of wind duct - question
  by "Harold Chase" <wa1vvh@net1plus.com>
 

(back) Subject: diameter of wind duct - question From: "Harold Chase" <wa1vvh@net1plus.com> Date: Sun, 12 Jan 2003 14:46:18 -0500   This is a multi-part message in MIME format.   ------=3D_NextPart_000_0007_01C2BA49.5DC892C0 Content-Type: text/plain; charset=3D"iso-8859-1" Content-Transfer-Encoding: quoted-printable   My wind duct from the reservoir will terminate in an 18" X 24" X 9" =3D distribution box which will be have room for up to 3 output ports, =3D which I am starting to build now. It will mount between 2 of = =3D my ceiling beams in my post-and-beam house. Because of the =3D layout of the house, there will be about 5 feet of distance between this = =3D box and each of two assemblies of pipework, which will sit on 2 =3D "flying" beams that go overhead, across the living room which has a =3D cathedral ceiling --( and enough height for 8' pipes! )   My question is, given a rank of 4' flute d'amour and a krummhorn fed =3D from this box by one 5 foot long connecting duct, and an 8' =3D principal on a second one (going to the other beam) , what is a =3D minimum diameter of piping to bring the wind to the windchests, and =3D avoid noticable fluctuation in the windpressure when that low note is =3D played? I know, the bigger the better; but I need to do this so = =3D that the ceiling doesn't look like the air conditioning ductwork in a =3D factory... I can just fit up to 4" dia piping here, but would = =3D prefer to go to 3" if that will work. What can I get away with? = =3D Any info from the wealth of experience out there is welcome!       Harry Chase       ------=3D_NextPart_000_0007_01C2BA49.5DC892C0 Content-Type: text/html; charset=3D"iso-8859-1" Content-Transfer-Encoding: quoted-printable   <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META content=3D3D"text/html; charset=3D3Diso-8859-1" =3D http-equiv=3D3DContent-Type> <META content=3D3D"MSHTML 5.00.2614.3500" name=3D3DGENERATOR> <STYLE></STYLE> </HEAD> <BODY bgColor=3D3D#ffffff> <DIV><FONT face=3D3DArial size=3D3D2>&nbsp;My wind duct from the = reservoir=3D20 will&nbsp;terminate in&nbsp;an 18" X 24" X 9"&nbsp; distribution box =3D which will=3D20 be have room for up to 3 output ports, which I am starting to build=3D20 now.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;It =3D will mount=3D20 between 2 of my ceiling beams in my post-and-beam=3D20 house.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =3D &nbsp;&nbsp;&nbsp;=3D20 Because of the layout of the house, there will be about 5 feet of =3D distance=3D20 between this box and&nbsp;each of two assemblies of pipework,&nbsp; =3D which will=3D20 sit on 2 "flying" beams that go overhead,&nbsp; across the living room =3D which has=3D20 a cathedral ceiling --( and enough height for 8' pipes! )</FONT></DIV> <DIV>&nbsp;</DIV> <DIV><FONT face=3D3DArial size=3D3D2>My question is,&nbsp; given a rank of = =3D 4' flute=3D20 d'amour and a krummhorn fed from this box by one 5 foot long connecting = =3D duct,=3D20 &nbsp;&nbsp; and an 8' principal&nbsp;on a second one (going to the =3D other beam)=3D20 ,&nbsp;&nbsp; what is a minimum diameter of piping to bring the wind to = =3D the=3D20 windchests,&nbsp; and&nbsp;avoid noticable fluctuation in the =3D windpressure when=3D20 that low note is played?&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; I know,&nbsp; the = =3D bigger=3D20 the better;&nbsp; but I need to&nbsp;do this so that&nbsp;the ceiling =3D doesn't=3D20 look like the air conditioning ductwork in a=3D20 factory...&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; I = =3D can=3D20 just fit up to 4" dia piping here,&nbsp; but would prefer to go to 3" if = =3D that=3D20 will work.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; What =3D can I get=3D20 away with?&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; = =3D Any info=3D20 from the wealth of experience out there is welcome!</FONT></DIV> <DIV>&nbsp;</DIV> <DIV>&nbsp;</DIV> <DIV>&nbsp;</DIV> <DIV><FONT face=3D3DArial size=3D3D2>Harry Chase</FONT></DIV> <DIV>&nbsp;</DIV> <DIV>&nbsp;</DIV></BODY></HTML>   ------=3D_NextPart_000_0007_01C2BA49.5DC892C0--