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Hello forumers-
I've got a very small organ; right now, only a single salicional rank that plays at 8' and 4' (on 4" wp). What I would like to do though, is add a 12 note bass extension to bring it down into the 16' octave, so I could convince myself that having a pedalboard is worth the trouble.
Of course there's always the possibility of searching Ebay or Craigslist in hopes that the bottom octave of a Bourdon or Subbass would come available, but I was hoping that instead, I could use the measurements from the pipes I already have, and build my own.
Well, I'm not entirely sure if what I've done so far is correct, but here's what I've got:
<ul>[*]The bottom octave will have to be of stopped wood, for space reasons. (I realize this will cut down the harmonics significantly, but hopefully with some sort of bridge, I'll be able to level it out to a more even match.)
[*]The basic construction of the pipe will be what Audsley called the Contrabass.
[*]The measurements of CCC (Width and Depth of the languid, Wood thickness) came from Laukhuff's Catalog for a small scaled Bourdon.
[*]From those starting measurements, I used this formula.
[*]To calculate the mouth height, I measured the CC from my current salicional rank, and found the ratio between mouth height and width to be 3/8. I used that ratio for the entire bottom octave.[/list]
All in all, here are the numbers I came up with:
<table style="border: 1px dotted rgb(10, 30, 150);">
<tbody>
<tr>
<td>Note</td>
<td>Wood Thickness</td>
<td>Mouth Height</td>
<td>Block Width</td>
<td>Block Depth</td>
</tr>
<tr>
<td>CCC</td>
<td>0.630</td>
<td>1.624</td>
<td>4.370</td>
<td>5.512</td>
</tr>
<tr>
<td>CCC#</td>
<td>0.630</td>
<td>1.569</td>
<td>4.185</td>
<td>5.278</td>
</tr>
<tr>
<td>DDD</td>
<td>0.591</td>
<td>1.503</td>
<td>4.007</td>
<td>5.054</td>
</tr>
<tr>
<td>DDD#</td>
<td>0.591</td>
<td>1.439</td>
<td>3.837</td>
<td>4.840</td>
</tr>
<tr>
<td>EEE</td>
<td>0.551</td>
<td>1.378</td>
<td>3.675</td>
<td>4.635</td>
</tr>
<tr>
<td>FFF</td>
<td>0.551</td>
<td>1.320</td>
<td>4.519</td>
<td>4.438</td>
</tr>
<tr>
<td>FFF#</td>
<td>0.512</td>
<td>1.264</td>
<td>3.370</td>
<td>4.250</td>
</tr>
<tr>
<td>GGG</td>
<td>0.512</td>
<td>1.210</td>
<td>3.227</td>
<td>4.070</td>
</tr>
<tr>
<td>GGG#</td>
<td>0.472</td>
<td>1.159</td>
<td>3.090</td>
<td>3.897</td>
</tr>
<tr>
<td>AAA</td>
<td>0.472</td>
<td>1.110</td>
<td>2.959</td>
<td>3.732</td>
</tr>
<tr>
<td>AAA#</td>
<td>0.433</td>
<td>1.063</td>
<td>2.834</td>
<td>3.574</td>
</tr>
<tr>
<td>BBB</td>
<td>0.433</td>
<td>1.012</td>
<td>2.714</td>
<td>3.422</td>
</tr>
</tbody></table>
Well, that's all the work I've done so far. My question, though, is that all justifiable and correct? If I build the pipes using those dimensions, will I have a stringlike bass octave that will play on 4", and sound at least close to matching a salicional sound?
Update:
Last night I went into my Church's organ to measure the dimensions of their subbass they have, voiced on 3.5" wp. Here's how the measurements compare:
<table style="border: 1px dotted rgb(10, 30, 150);">
<tbody>
<tr>
<td>
</td>
<td>My Rank</td>
<td>Subbass</td>
</tr>
<tr>
<td>Internal Width:</td>
<td>2.383</td>
<td>3.750</td>
</tr>
<tr>
<td>Internal Depth:</td>
<td>3.01</td>
<td>5.500</td>
</tr>
<tr>
<td>Mouth Height:</td>
<td>0.894</td>
<td>1.250</td>
</tr>
<tr>
<td>Wood Thickness:</td>
<td>0.374</td>
<td>0.625</td>
</tr>
</tbody></table>
Thanks,
lilshu
I've got a very small organ; right now, only a single salicional rank that plays at 8' and 4' (on 4" wp). What I would like to do though, is add a 12 note bass extension to bring it down into the 16' octave, so I could convince myself that having a pedalboard is worth the trouble.
Of course there's always the possibility of searching Ebay or Craigslist in hopes that the bottom octave of a Bourdon or Subbass would come available, but I was hoping that instead, I could use the measurements from the pipes I already have, and build my own.
Well, I'm not entirely sure if what I've done so far is correct, but here's what I've got:
<ul>[*]The bottom octave will have to be of stopped wood, for space reasons. (I realize this will cut down the harmonics significantly, but hopefully with some sort of bridge, I'll be able to level it out to a more even match.)
[*]The basic construction of the pipe will be what Audsley called the Contrabass.
[*]The measurements of CCC (Width and Depth of the languid, Wood thickness) came from Laukhuff's Catalog for a small scaled Bourdon.
[*]From those starting measurements, I used this formula.
[*]To calculate the mouth height, I measured the CC from my current salicional rank, and found the ratio between mouth height and width to be 3/8. I used that ratio for the entire bottom octave.[/list]
All in all, here are the numbers I came up with:
<table style="border: 1px dotted rgb(10, 30, 150);">
<tbody>
<tr>
<td>Note</td>
<td>Wood Thickness</td>
<td>Mouth Height</td>
<td>Block Width</td>
<td>Block Depth</td>
</tr>
<tr>
<td>CCC</td>
<td>0.630</td>
<td>1.624</td>
<td>4.370</td>
<td>5.512</td>
</tr>
<tr>
<td>CCC#</td>
<td>0.630</td>
<td>1.569</td>
<td>4.185</td>
<td>5.278</td>
</tr>
<tr>
<td>DDD</td>
<td>0.591</td>
<td>1.503</td>
<td>4.007</td>
<td>5.054</td>
</tr>
<tr>
<td>DDD#</td>
<td>0.591</td>
<td>1.439</td>
<td>3.837</td>
<td>4.840</td>
</tr>
<tr>
<td>EEE</td>
<td>0.551</td>
<td>1.378</td>
<td>3.675</td>
<td>4.635</td>
</tr>
<tr>
<td>FFF</td>
<td>0.551</td>
<td>1.320</td>
<td>4.519</td>
<td>4.438</td>
</tr>
<tr>
<td>FFF#</td>
<td>0.512</td>
<td>1.264</td>
<td>3.370</td>
<td>4.250</td>
</tr>
<tr>
<td>GGG</td>
<td>0.512</td>
<td>1.210</td>
<td>3.227</td>
<td>4.070</td>
</tr>
<tr>
<td>GGG#</td>
<td>0.472</td>
<td>1.159</td>
<td>3.090</td>
<td>3.897</td>
</tr>
<tr>
<td>AAA</td>
<td>0.472</td>
<td>1.110</td>
<td>2.959</td>
<td>3.732</td>
</tr>
<tr>
<td>AAA#</td>
<td>0.433</td>
<td>1.063</td>
<td>2.834</td>
<td>3.574</td>
</tr>
<tr>
<td>BBB</td>
<td>0.433</td>
<td>1.012</td>
<td>2.714</td>
<td>3.422</td>
</tr>
</tbody></table>
Well, that's all the work I've done so far. My question, though, is that all justifiable and correct? If I build the pipes using those dimensions, will I have a stringlike bass octave that will play on 4", and sound at least close to matching a salicional sound?
Update:
Last night I went into my Church's organ to measure the dimensions of their subbass they have, voiced on 3.5" wp. Here's how the measurements compare:
<table style="border: 1px dotted rgb(10, 30, 150);">
<tbody>
<tr>
<td>
</td>
<td>My Rank</td>
<td>Subbass</td>
</tr>
<tr>
<td>Internal Width:</td>
<td>2.383</td>
<td>3.750</td>
</tr>
<tr>
<td>Internal Depth:</td>
<td>3.01</td>
<td>5.500</td>
</tr>
<tr>
<td>Mouth Height:</td>
<td>0.894</td>
<td>1.250</td>
</tr>
<tr>
<td>Wood Thickness:</td>
<td>0.374</td>
<td>0.625</td>
</tr>
</tbody></table>
Thanks,
lilshu
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