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pyramid head
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Fri Apr 11, 2008 3:53 pm

Well, you might never know because it has not been hooked up yet. Some people would doubt that it ever will be.
Pyramid head walks into a bar... there are no survivors.

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Henry455
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Fri Apr 11, 2008 5:22 pm

Published running amps on a Q is approx. 100 amps. 1 HP is equal to 746 watts, assuming optimistic 80% motor efficiency, running HP is 1.3. Starting/inrush amps can be as high as 250 amps which equates to 3 + peak hp. One of these days I will borrow a dc ampmeter or shunt and try to measure actual current draw. The rotor diameter on my Q is a little over 9 inches.
Here are some pics of my 40 year old Q:
Image
Image

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SirenMadness
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Fri Apr 11, 2008 6:53 pm

Robert Gift wrote:I doubt the motor is capable of 2 hp.

I would expect ram air to spin the rotor, therefore prolonging wind-down.
But ram air definitely increases volume output.

I'm hoping to bring my squirrel cage blower to "super charge" the 2t22
and see if it makes a difference.

I would not pipe the air because the 2t22 make suck in more air than the squirrel cage blower is capable of putting out.
But I will blow the air up into the 2t22 bottom intake tube.
Ram air actually slows the rotor down, as it adds resistance, provided that the rotor has straight blades in relation to its back wall.
~ Peter Radanovic

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Henry455
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Fri Apr 11, 2008 7:43 pm

Regarding ram air prolonging coasting, I would guess straight blade rotors would see no or possible negative benefits but on the Q's curved blade rotor I would think it would be of some benefit. Many years ago I was a member of a volunteer rescue squad that ran Q's on most of their vehicles and a few of the Q's with well balanced rotors and "broken in" bearing would "growl" at freeway speeds.

The rotor of a Q is in the lower right of this pic:
Image

Robert Gift
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Fri Apr 11, 2008 11:22 pm

Beautiful Q, Henry.
Was it ever used on a vehicle?

Thanks, also for the different rotors displayed.

The Q rotor is a work of art, too.

Interesting that they "growled" at higher vehicle speeds.
I never noticed ours do that.

Their published inrush and maintenence amps are too conveniently even numbers.
Would like to know the REAL values.

Robert Gift
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Sun Apr 13, 2008 2:07 am

pyramid head wrote:Well, you might never know because it has not been hooked up yet. Some people would doubt that it ever will be.
Who?
Lassie?
She has been growling and howling on 240 V three-phase since 2006, annoying the whole area every first Saturday of the month at precisely 12:00:00.
Image
Since this photo, I have attached all 22 projectors (cones)

She almost announced her first tornado warning!: Aurora, to our west, sounded their Whelen 2900s(?)
But examining the skies, I could find nothing, so Lassie did not speak.

Corey Hudson
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Sun Apr 13, 2008 2:13 am

She has been growling and howling on 240 V three-phase since 2006, annoying the whole area every first Saturday of the month at precisely 12:00:00.
Do you have a video?
-Corey-

Robert Gift
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Sun Apr 13, 2008 2:19 am

coreyhudson2 wrote:...Do you have a video?
Yes.
Recorded on a JVC Hard Drive camcorder which my Lt. downloaded into the fire department computer.
I'll ask if he can post it somewhere.
On one test, after turning off the switch, I took the camcorder right up to the siren and viewed up the bottom intake tube and then into a lower projector.
From peak RPM it takes 2 minutes, 38 seconds to slow to full stop.

Corey Hudson
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Sun Apr 13, 2008 2:23 am

From peak RPM it takes 2 minutes, 38 seconds to slow to full stop.
Those are some good bearings!

Are you powering it by an
AR timer, or by light-switch to relay?
-Corey-

Robert Gift
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Sun Apr 13, 2008 2:36 am

coreyhudson2 wrote:
From peak RPM it takes 2 minutes, 38 seconds to slow to full stop.
Those are some good bearings!
Are you powering it by an
AR timer, or by light-switch to relay?
I wonder if our lower humidity and air density at 5,200 feet allows longer wind-down? Haven't done any calculations.

AR timers? We don't need no stinkin' AR timers.

Light switch to 120 V actuated motor starter.
(I wanted to mount the switch just inside the sewage plant laboratory door!!!)

The switch is 6 feet up on the wall in the far corner of the lab under a piece of tape to discourage accidental operation.
I use a large quartz clock with sweep second hand to time the tests.
To emulate Attack: ON 6 seconds, OFF 6 seconds.
ON only 1 second does a "Growl".

Confucius say: Crowded elevator smell different to midget.
Last edited by Robert Gift on Sun Apr 13, 2008 2:39 am, edited 1 time in total.

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