q2bman
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My aquired Q

Thu Jun 07, 2007 6:55 am

Dude! I just snagged a model Q2A from an old fire truck for $100

I mounted it to my jeep. This siren replaces my Model 78. I'll sell it off. Video's to follow!
Q2B or not 2B that is the question.

Robert Gift
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Thu Jun 07, 2007 2:22 pm

Congratulations 2Q2bman. (You're now required to change your name)
I'm jealous.
Sell me your model 78.
I'll try to do tests in water at low speed.
Would rather attach a hand crank to it for that.

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Shinkansen
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Thu Jun 07, 2007 7:59 pm

O_O Testing it in water would break it! And with a siren like a 78? I should think not! Q2bman, I've got around like $50. It's not much but I've got $20 more on the way. I would like to buy that siren from you. Where are you at?
Blades will bleed. Shields Will Shatter. But as the light fades, will the Hero rise again? Or will darkness rein?

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JasonC
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Thu Jun 07, 2007 8:52 pm

Robert Gift, A&A wrote:Congratulations 2Q2bman. (You're now required to change your name)
I'm jealous.
Sell me your model 78.
I'll try to do tests in water at low speed.
Would rather attach a hand crank to it for that.

Why do you want to put a siren in water so bad? Its already a documented scientific fact of what happens when you do that (when you have enough power). A 78 wouldn't have enough power to do anything more than spin in the water and maybe make a few cavitation bubbles. Look at a pump for another example. Pumps have impellers almost identical to siren rotors.

q2bman
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Fri Jun 08, 2007 1:20 am

Oh no sir. My siren would have to go to a good home! No watery grave!

Shinkansen


I'm in Fort Worth. Do you have something to power this 78? Takes a ton of juice.
Q2B or not 2B that is the question.

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Shinkansen
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Fri Jun 08, 2007 3:32 am

q2bman wrote:Oh no sir. My siren would have to go to a good home! No watery grave!

Shinkansen


I'm in Fort Worth. Do you have something to power this 78? Takes a ton of juice.
I should. Is it 6v or 12v?
Blades will bleed. Shields Will Shatter. But as the light fades, will the Hero rise again? Or will darkness rein?

Robert Gift
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Fri Jun 08, 2007 5:58 am

JasonC wrote:Why do you want to put a siren in water so bad? Its already a documented scientific fact of what happens when you do that (when you have enough power). A 78 wouldn't have enough power to do anything more than spin in the water and maybe make a few cavitation bubbles. Look at a pump for another example. Pumps have impellers almost identical to siren rotors.
Gotta try it and see for myself.
I would not spin a rotor at a high speed. I would not want to harm it.
Even though water does not compress, at low rpm I would expect some chopping and pressure pulses through the water. Not fast enough to cause cavitation. That's why I'd want to turn the rotor by hand crank.

q2bman
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Sat Jun 09, 2007 11:47 pm

just seems like siren and water = bad combination.


The 78 is a 12v siren. Pulls the same current as a Q. 100 Amp initial pull.
It can be operated with low power but it takes forever to wind up.
Q2B or not 2B that is the question.

Robert Gift
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Sun Jun 10, 2007 12:08 am

q2bman wrote:just seems like siren and water = bad combination.
It is - unless done slowly and carefully.
q2bman wrote:The 78 is a 12v siren. Pulls the same current as a Q. 100 Amp initial pull.
It can be operated with low power but it takes forever to wind up.
Didn't realize it is same amperage draw.
How do you get lower power? Battery Charger? Power drawn through headlight bulb?

q2bman
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Sun Jun 10, 2007 4:55 am

Low power as in not enough with my alternaor. I need a high amp alternator for that q. Works good enough as I don't realy need it. The model 78 has a smaller stator and rotor. I imagine it doesn't need as much as the ten inch Q. The power required for the Q to spin up has to be more than the model 78. Smae exact motor though. My 78 had a little cover that attatched arround the comutator to keep water out. My Q didn't. It has the chrome shroud. I removed the shroud and swaped the plate to the Q so I could use the same mount. Same motor exactly!
Q2B or not 2B that is the question.

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