# Organ Pipes

1. Oct 7, 2008

### curlyman

Hi can anyone help me? I am researching into organ pipes, and dealing with a flue organ pipe that is 16ft long and open at the top, my conundrum is: is the organ pipe open at the bottom where the air flow enters? i can find no definitive answers, can anyone help/send me a link?
thanks

2. Oct 7, 2008

### FredGarvin

I can't really say between the different types. Admittedly I thought there was one basic design and slight variations from that. The ones I have seen were open on the bottom. They taper down in diameter and then basically plug into the air manifold. There is a Dirty Jobs episode where they clean a pipe organ and every single pipe. Here's a link that may help:

http://www.lawrencephelps.com/Documents/Articles/Beginner/pipeorgans101.html

3. Oct 7, 2008

### atyy

Fletcher and Rossing (http://books.google.com/books?id=9CRSRYQlRLkC, p557) state that the lowest note of an 8 ft rank produces 65 Hz pitch. If use http://hyperphysics.phy-astr.gsu.edu/hbase/waves/opecol.html, I find that a 65 Hz fundamental is produced by an ~8 ft (2.4 m) open or closed conical end.

http://www.nazard.co.uk/organ.html#pitch states that a 2 ft flue produces middle C. They state this to be 512 Hz, but most pianists think it's 260 Hz. If I use 260 Hz in the hyperphysics calculator, I find that it corresponds to an ~2 ft (0.6 m) open or closed conical end.

Nazard also says that a stopped 8' Diapson is only 4' long.

Last edited by a moderator: Apr 23, 2017