DIYAPASON-L Digest #158 - Wednesday, October 11, 2000
 
Re: [Residence Organs]  Diapason article
  by <GRSCoLVR@aol.com>
Re: [Residence Organs] How is your project going?
  by "s c bournias" <chrisbournias@hotmail.com>
Re: [Residence Organs]  Re: [Residence Organs] How is your project  going
  by "Kelvin Smith" <KelvinSmith@untraveledroad.com>
Blower experiments
  by "Larry Chace" <RLC1@etnainstruments.com>
 

(back) Subject: Re: [Residence Organs] Diapason article From: <GRSCoLVR@aol.com> Date: Wed, 11 Oct 2000 00:39:28 EDT   Hi Rick--- I thawt it was a damned good read. Very informative and chock full = of ideas of what do to with limited space. Cheers, ---Roc  
(back) Subject: Re: [Residence Organs] How is your project going? From: "s c bournias" <chrisbournias@hotmail.com> Date: Wed, 11 Oct 2000 11:39:26 EDT   Very interesting update. Could you furnish a complete stop list of your instrument? Would find it intersting reading. Steve Bournias     >From: Kelvin Smith <KelvinSmith@untraveledroad.com> >Reply-To: "Residence Organ List" <DIYAPASON-L@pipechat.org> >To: "Residence Organ List" <DIYAPASON-L@pipechat.org> >Subject: Re: [Residence Organs] How is your project going? >Date: Tue, 10 Oct 2000 12:48:51 -0600 > >Hello all, > >I started a couple months ago installing my new (used) 4m drawknob = console. >That process is completed now, at least in that the old console is gone = and >the new console does all that it ever did and more. I have all the old >ranks playing, plus one additional flute for the great. There are 30 = ranks >playing, including pedal 8 and 4' diapason which I have to reduce the >pressure on before they will be usable. On the old console the swell = shades >worked backward and with the computerized system in the new console, I = was >able to make these work the right way. I also hooked up the crescendo = pedal >and the sforzando toe stud. > >The combination action doesn't work because I don't have it winded yet. I >have to releather the regulator for the console. I have some wiring to do >for it also. I have a 3 rank mixture which is waiting for nothing except = a >couple 3" elbows to get it winded, and I haven't gotten to this. Only = about >half of my choir shades are working. I have a16' tuba which I have to >figure out how to get into operation and a couple other ranks. There is >also a Vox waiting on windlines. > >I have been practising the Bach and the Widor for the upcoming >"spectacular" in our area. It certainly rattles the rafters. I need >desperately to do a bunch of voicing work. Most of the soft stops are >sounding very nice. But the gt 4' octave is bright enough to cover for a = 2' >and 2 2/3' serves as my mixture. When I want it loud, they do quite = nicely, >but there are some missing increments in the middle. > >Kelvin > > > >DIYAPASON-L: a Discussion list for owners and builders of their own >Residence Pipe Organs. >HOMEPAGE : http://www.diyapason.pipechat.org >List: mailto:DIYAPASON-L@pipechat.org >Administration: mailto:owner-DIYAPASON@pipechat.org >   _________________________________________________________________________ Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com.   Share information about yourself, create your own public profile at http://profiles.msn.com.    
(back) Subject: Re: [Residence Organs] Re: [Residence Organs] How is your project going? From: "Kelvin Smith" <KelvinSmith@untraveledroad.com> Date: Wed, 11 Oct 2000 11:28:47 -0600   Steve,   See my webpage at   http://www.untraveledroad.com/PipeOrgan/Pipe_Organ.html   I need to work on the web page some more sometime, but it has the specs = and pictures and some more.   Kelvin   >Very interesting update. Could you furnish a complete stop list of your >instrument? Would find it intersting reading. Steve Bournias > > >>From: Kelvin Smith <KelvinSmith@untraveledroad.com> >>Reply-To: "Residence Organ List" <DIYAPASON-L@pipechat.org> >>To: "Residence Organ List" <DIYAPASON-L@pipechat.org> >>Subject: Re: [Residence Organs] How is your project going? >>Date: Tue, 10 Oct 2000 12:48:51 -0600 >> >>Hello all, >> >>I started a couple months ago installing my new (used) 4m drawknob = console. >>That process is completed now, at least in that the old console is gone = and >>the new console does all that it ever did and more. I have all the old >>ranks playing, plus one additional flute for the great. There are 30 = ranks >>playing, including pedal 8 and 4' diapason which I have to reduce the >>pressure on before they will be usable. On the old console the swell = shades >>worked backward and with the computerized system in the new console, I = was >>able to make these work the right way. I also hooked up the crescendo = pedal >>and the sforzando toe stud. >> >>The combination action doesn't work because I don't have it winded yet. = I >>have to releather the regulator for the console. I have some wiring to = do >>for it also. I have a 3 rank mixture which is waiting for nothing except = a >>couple 3" elbows to get it winded, and I haven't gotten to this. Only = about >>half of my choir shades are working. I have a16' tuba which I have to >>figure out how to get into operation and a couple other ranks. There is >>also a Vox waiting on windlines. >> >>I have been practising the Bach and the Widor for the upcoming >>"spectacular" in our area. It certainly rattles the rafters. I need >>desperately to do a bunch of voicing work. Most of the soft stops are >>sounding very nice. But the gt 4' octave is bright enough to cover for a = 2' >>and 2 2/3' serves as my mixture. When I want it loud, they do quite = nicely, >>but there are some missing increments in the middle. >> >>Kelvin >> >> >> >>DIYAPASON-L: a Discussion list for owners and builders of their own >>Residence Pipe Organs. >>HOMEPAGE : http://www.diyapason.pipechat.org >>List: mailto:DIYAPASON-L@pipechat.org >>Administration: mailto:owner-DIYAPASON@pipechat.org >> > >_________________________________________________________________________ >Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com. > >Share information about yourself, create your own public profile at >http://profiles.msn.com. > > >DIYAPASON-L: a Discussion list for owners and builders of their own >Residence Pipe Organs. >HOMEPAGE : http://www.diyapason.pipechat.org >List: mailto:DIYAPASON-L@pipechat.org >Administration: mailto:owner-DIYAPASON@pipechat.org        
(back) Subject: Blower experiments From: "Larry Chace" <RLC1@etnainstruments.com> Date: Wed, 11 Oct 2000 23:43:07 -0400   Hi, all. I've just performed a few experiments that I thought might (or might not) be of interest to some. The basic consideration is the effect of running a small Ventus blower on 3ph power rather than 1ph. The blower in question is one of their recent 1/4hp units with a cast aluminum housing. It was fitted with a pair of capacitors that serve to simulate the 3rd phase, and those capacitors were sized for use on 110v. The 3ph power was provided by a variable frequency drive unit ("VFD"), model SN103S, made by the AC Technology Corporation of Uxbridge, Massachusetts (www.actech.com). This device takes 1ph AC at 110 or 220v and produces = 3ph power at 230v with a frequency that can be adjusted from 0hz to 99hz.   Lacking any really good measurement devices, I constructed a small windchest, about 7" by 7" by 12" long that I connected to the blower by a short (3') length of 3" Flexaust. (For reasons that may become apparent later, I probably should have used 4" Flexaust, but the 3" flange was already mounted on the blower output.) This chest accepted the 3" = windline into one end, and I cut a 3" diameter hole in the top of the chest near = the same end. Near the other end of the top I drilled a 3/8" hole to which I connected a normal water-tube manometer (one that my father had built = about 40 years ago). I arranged the measurement hole away from the "test" hole to try to avoid losses due to air movement ("pitot tube effect", if I recall the term correctly).   The test variable was the size of the exhaust hole in a series of 1/4" plywood plates that I placed over the 3" hole. I guessed as to "good" sizes. With the blower running, I'd place each plate over the 3" hole and then note the pressure inside the chest, as shown on the manometer. As a further test, I also used a 12" length of 2" PVC tubing in conjunction = with the 2" test plate.   The tests were run with the blower operating on 110v 1ph 60Hz and then = with it running at 230v 3ph at 54Hz, 60Hz, and 66Hz. I limited the speed variation to +/- 10% at the suggestion of a Laukhuff representative. Here are the results, with the hole diameter and the measured pressures (to the nearest .25"):   OPENING 1ph/60Hz 3ph/54Hz 3ph/60Hz 3ph/66Hz OPEN AREA 0.00" 5" 4" 5" 6" 0.00sq" 0.50" 5" 4" 5" 5.75" 0.20sq" 1.00" 4.5" 3.75" 4.5" 5.5" 0.79sq" 1.50" 4" 3.25" 4" 4.5" 1.77sq" 2.00" 3" 2.5" 3" 4" 3.14sq" 2.00" tube 2.75" 2.5" 3" 3.25" 3.14sq" 2.50" 1.75" 1.75" 2" 2.5" 4.91sq" 3.00" 1.5" 1.5" 1.5" 1.75" 7.07sq"   I included the final column (area of the hole), as a very rough indicator of the sort of load that the blower was trying to overcome. There is much non-linearity here, and several folks (including Loren Weaver and Al Sefl) have sent me some formulae that could be used to try to calculate the resulting blower capacities in cubic feet per minute or cubic meters per second. I've run the calculations but the result are rather different = from the 3 data points that are given in the OSI catalog.   It does seem that the VFD does not make a big difference (or even much of one) when it is running at 60Hz. Now, in a *real* organ situation, there might be some different results! Operating the blower at slightly higher speeds, however, does increase the pressure at a given load. (Not rocket science and not a surprise!)   At 60Hz, the motor's theoretical speed is 3600 rpm, and the nameplate specifies 3360 rpm. At 66Hz, the theoretical speed would be 3960 rpm, which would correspond to a specified speed of about 3696 rpm.   This particular VFD can accept 110v or 220/240v input and it is UL-rated = as a thermal overload protection device when it is used to operate a single motor, whose operating voltage will always be 230v. The output is in the form of pulse width modulation and is not related to the input voltage or phases in any way. When the device starts the motor, it does so slowly; = 20 seconds is the default acceleration time, but that any many other parameters can be adjusted via the device's small control panel. This model, suitable for a 1/4hp motor, costs $160, with larger capacity = devices costing a little more. AC Technology has a large line of such devices, = and other companies also provide similar units.   One small surprise was that the device would trip the GFI circuit breaker in my shop when the motor speed got to about 14Hz. I called their tech support and was told that the device has a certain amount of capacitive coupling on its inputs, and that can be sufficient to confuse a GFI. I also found out that one of their larger units is being used at Shea's Buffalo Theatre to provide 25Hz power for the 30hp Spencer Turbine on the large Wurlitzer there; the local power company has finally stopped providing 25Hz service in downtown Buffalo.   I hope this may be of use to some folks!   Larry Chace