'Organ 2' plans
After having built my first organ, I immediately decided that I should build an even
bigger and better organ. To this effect, I started making plans for it on my computer.
Unlike the first organ, this one was going to have a design, and everything would be
so much better. Of particular interest was making something that could support multiple
registers of pipes, and building it in such a way that the pipes could be more easily
removed for tweaking, voicing, and tuning.
Seeing that I don't actually play the organ, except for improvising on it when nobody
is in the house, I never was able to either justify the effort, or find the motivation
to do it. Nevertheless, I think the drawings might be interesting to look at.
The fan and pressure regulating bellows would go under the main part of the organ. I
didn't bother trying to plan this part out.
Front view of my 'Organ 2' design
Unlike the organ I built, in this design, the valves are spaced far enough apart so that
the pipes can be directly connected to the wind chest. This requires a lever mechanism
of some sort to translate the motion of the keys to the windchest. In this design, this
is achieved by all the slanted levers on the front.
The windchest would be arranged in such a way that one register consists of two interleaved
rows of whole tone scales, so that the organ does not need to be wide enough to accinidate
all the pipes in one row. As such, each register has two rows of valves in the wind chest.
Side view of my 'Organ 2' design
The wind chest was going to be what is known as a 'ventil windchest' design.
This type of windchest has one valve for each
pipe in each register, as opposed to one valve to operate all
the pipes operated by that key.
In this design, the various registers are turned on by pressurizing
various sections of the wind chest - thus no troublesome sliders to jam.
It also has the advantage that the the various registers
can be operated at different pressures, and that the response time is quicker.
Wind chest cross section of the 'Organ 2' design
Organs that use solenoids to open valves at the pipes are of course even quicker, but
to purists, this is an abomination, because it takes away the velocity sensitivity of the keys.
The design of my first organ is very sensitive to how fast, and how far the keys are
pressed, and I consider this to be a feature.
The design here does have the potential problem that the shafts passing through the windchest
must pass through various chambers in the wind chest, each of which may be pressurized
differently. Thus, finding a good way of passing the shaft through a hole without too
much air leakage around it, and without binding, is one of the key challenges of implementing this design.
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