DIYAPASON-L Digest #727 - Thursday, January 16, 2003
diameter of wind duct - question
  by "Richard Schneider" <>

(back) Subject: diameter of wind duct - question From: "Richard Schneider" <> Date: Thu, 16 Jan 2003 09:02:02 -0600   > Harold Chase wrote: > > My question is, given a rank of 4' flute d'amour and a krummhorn fed > from this box by one 5 foot long connecting duct, and an 8' > principal on a second one (going to the other beam) , what is a > minimum diameter of piping to bring the wind to the windchests, > and avoid noticable fluctuation in the windpressure when that low note > is played? I know, the bigger the better; but I need to do this > so that the ceiling doesn't look like the air conditioning ductwork in > a factory... I can just fit up to 4" dia piping here, but > would prefer to go to 3" if that will work. What can I get > away with? Any info from the wealth of experience out there > is welcome!   I haven't noticed anyone else answer this, so I thought I'd jump in.   Because a reed is involved, along with a flute rank, I'd want to see at LEAST 4", but 6" would be better. Failing that, you might be able to help stabilize things with fitting a "Winker" (Wind Stabilizing device) to the bottom of the Windchest at the extreme end.   Also, using rectangular metal duct will help minimize the "factory" look you're fearful of.   Windpressure is also a factor here.   Faithfully,   -- Richard Schneider, PRES/CEO SCHNEIDER PIPE ORGANS, Inc. Pipe Organ Builders 41-43 Johnston St./P.O. Box 137 Kenney, IL 61749-0137 (217) 944-2454 VOX (217) 944-2527 FAX SHOP EMAIL SHOP SATELLITE EMAIL HOME OFFICE EMAIL WEB PAGE URL