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| Hancock 4700N whistle? https://www.rypn.org/forums/viewtopic.php?f=1&t=24943 |
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| Author: | David H. Hamley [ Mon Mar 10, 2008 12:16 pm ] |
| Post subject: | Hancock 4700N whistle? |
Pennsylvania Trolley Museum has acquired a 1953 GE 25 tonner that will eventually become our broad gauge shop switcher and rescue loco. We'd like to equip it with a Hancock 4700N whistle--the type popular on the NH, Clinchfield, and a few others. I'm told they are very scarce and thus we're unlikely to find one for sale. OK, let's try the alternate: Make one ourselves. Does anyone have the drawing for this device? Or does anyone have one they'd be willing to loan to PTM to be (carefully) dismantled for production of a drawing? We'd then make the drawing available to anyone who wanted it. It's the sound that counts most to us, owning the real thing isn't that important. |
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| Author: | Alexander D. Mitchell IV [ Mon Mar 10, 2008 2:27 pm ] |
| Post subject: | Re: Hancock 4700N whistle? |
An awful lot of the trouble has already been done on your behalf by whistle and horn hobbyists. No need to reinvent the wheel. Check out the Yahoo Groups "Steam-Whistles" http://groups.yahoo.com/group/steam-whistles/ and "Horn and Whistle": http://groups.yahoo.com/group/Horn_Whistle/ The former group is largely concerned with restoration, engineering, replication, and sound physics, while the latter is a bit more geared toward both horn mechanics/dynamics and collecting. The former's file archives are loaded to the gills with engineering spreadsheets, designs, etc. The odds are better than 50-50 that someone has already undertaken attempts to replicate the Hancock 4700, with or without reflector. The odds are about 100% that members of both groups will point out everything Hancock did wrong with that air whistle design and offer you a vastly improved design with better efficiency, better dynamic and audio qualities, and easier construction. |
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