# 0.75Hz

#### TimMc

##### Well-Known Member
Not to go off into the weeds of pipe organs but those long, large pipes need considerable air volume, pipe chamber real estate, and mechanical support, too. Those are expensive and why "resultant" and electronic pedal stops are used. The pic of the woman with the 64' pipe gives some perspective.

I think there are 2 playing instruments that have 64' stops in the USA - the Wannamaker in Philly and possibly the organ in Boardwalk Hall in Atlantic City (if they've gotten it restored to that point). The Atlantic City organ is a fairly high wind pressure instrument and some of stops have threaded pipe toes and wind chests to keep from launching the pipes into orbit.

Pipe organs can be fascinating instruments. If you have an opportunity to be in a pipe chamber while it's being played you're in for a new experience.

#### RonHebbard

##### Well-Known Member
15 Hz induces vomit. I wounder what digestive effects <10 Hz produce? Better get out the plastic bed sheets!
As for pipe organs, many use a "Speaker Stop" for the 32 foot rank. Generally, you would have to double the size of the casement to pipe it as the size of the pipes is equal to the complete size of all other ranks combined, in most cases.
And then there's the 64 foot stop....
View attachment 18533
Along with the dual, multi-horse, three phase motors spinning the dual centrifugal blowers ramming air into the four, or more, expanded bellows with the weights on top. My favorite was the wind powered percussion section with the snare drum with three sticks: Two for playing and the third dedicated to rim shots. The concept of a three armed drummer always made me giggle.
Toodleoo!
Ron Hebbard

#### JD

##### Well-Known Member
Pipe organs can be fascinating instruments. If you have an opportunity to be in a pipe chamber while it's being played you're in for a new experience.
Currently singing (temporary) in one choir where the loft is embedded in the pipe chest. Although some of the front pipes are decorative, the real pipes are directly behind. A very dreamy stereo experience!

RonHebbard

#### tjrobb

##### Well-Known Member
I worked for six years in a theatre from 1928 that still had the original organ. A) They are fascinating instruments. B) Actual two-phase power confuses a lot of electricians (used for the blower).

RonHebbard

#### RonHebbard

##### Well-Known Member
I worked for six years in a theatre from 1928 that still had the original organ. A) They are fascinating instruments. B) Actual two-phase power confuses a lot of electricians (used for the blower).
One that's still in regular operation in our area has two centrifugal blowers each in the 25 to 30 horsepower neighborhood. The blowers fill four bellows each roughly 4' x 6' which grow from approximately 30" to a little over 6' in eight. The bellows have weight on their tops to force them rapidly down when their additional air is called upon to play sustained multi-note chords with multiple pedal pipes at high volume. I was always fascinated watching the bellows expand upon powering up then descending during play. Standing next to the bellows was like watching the organ breath.
We used to have two similar organs in our area, one in a ~2,000 seat film theatre from the vaudville days, this is the one that had the snare drum with 3 sticks, one dedicated to playing rim shots, the other, the one still in well maintained regular operation, is in a Catholic minor Basillica. The Anglicans may have another real pipe organ but I can't attest to that (although I'm in regular contact with an Anglican who often practices on his church's organ.)
Toodleoo!
Ron Hebbard

#### Jay Ashworth

##### Well-Known Member
Yep, multi-horse.

I'm told that 40-50HP motors are not at all uncommon on organs with 32' and 64' stops.

Such motors require a 480V 3ph separate service at at least 30A per leg, per motor, if not 50A.

#### RonHebbard

##### Well-Known Member
Yep, multi-horse.

I'm told that 40-50HP motors are not at all uncommon on organs with 32' and 64' stops.

Such motors require a 480V 3ph separate service at at least 30A per leg, per motor, if not 50A.
@Jay Ashworth Agreed; 277 / 480 on your side of Donald's walls, 347 / 600 up here on my side.
Toodleoo!
Ron Hebbard

Jay Ashworth

#### Jay Ashworth

##### Well-Known Member
In the US, 600 commences Medium Voltage (well, unless you're a Utility guy, in which case, MV is 4KV to probably 14KV), and requires much more expensive electricians.

#### RonHebbard

##### Well-Known Member
In the US, 600 commences Medium Voltage (well, unless you're a Utility guy, in which case, MV is 4KV to probably 14KV), and requires much more expensive electricians.
@Jay Ashworth Up here, north of the walls, 120 /240, 120 / 208 and 347 / 600 are the common voltages we see in homes, strip malls and light, very light, industries. 13.8 KV and 27.6 KV are the highest we'd normally find feeding larger buildings, theatres and running around university campuses. Above 27.6 KV is up poles or towers and the lasses and lads from our power companies pay us a visit.
Toodleoo!
Ron Hebbard

#### tjrobb

##### Well-Known Member
In the US, 600 commences Medium Voltage (well, unless you're a Utility guy, in which case, MV is 4KV to probably 14KV), and requires much more expensive electricians.
The newest NEC bumped low-voltage to 1000V, largely to incorporate solar systems.
Utilities often go MV thru 34.5kV, as there are several large industries that use it (I know of four plants in our city, maybe more, all are in food production FWIW).

RonHebbard

#### Jay Ashworth

##### Well-Known Member
Yeah, the only place around here I see any delivery higher than 14kV is things like mills and stuff; everything else is transmission and sub-T voltages.

#### JonCarter

##### Well-Known Member
But to get back to the original subject as I said a long time ago, "Like most of such products, it's a device to make \$ for the seller. He'll make a bunch of it before enough publicity about "Another useless product" APppears and he DISappears. People will by anything.

"Emperor's new clothes" all over again.