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A water rocket is a type of model rocket using water as its reaction mass. The pressure vessel (the engine of the rocket) is constructed from thin plastic or other non metallic materials (usually a used plastic soft drink bottle) weighing 1,500 grams or less. The water is forced out by compressed air. It is an example of Newton's third law of motion.

I want a strong electric motor

Discussion about Compressors, hose, pipes, fittings, launchers, release mechanisms, and launch tubes.
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RaZias
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I want a strong electric motor

Post by RaZias » Wed Jun 09, 2010 2:38 pm

I was wondering where I can get a strong electric motor to replace the ones of those 12v compressors.

A 12V would be nice.

Any electric engineer around here that could advise me ?

Do some devices carry this type of motors so I can take them out ?


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RaZias
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Re: I want a strong electric motor

Post by RaZias » Fri Jun 11, 2010 2:53 pm

I disasembled an electric air fan to see its electric motor.
The fan works at same voltage gaved from house plugs so it´s not a 12V electric motor.

I won´t use this fan but I will buy one to change the 12v motor of the small compressor.
air fan motor.jpg
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Re: I want a strong electric motor

Post by WRA2 » Fri Jun 11, 2010 3:26 pm

What about a motor from a cordless drill?

Those have lots of torque and run on DC voltages between 9 and 24v.

By disassembling the drill you will also gain a good supply of gears.


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Re: I want a strong electric motor

Post by RaZias » Sat Jun 12, 2010 4:01 pm

I also tough in puting a bycicle cranks in the compressor so it could be manualy powered :roll:
But I think doing the work with the hands would be hard.

I also could put the compressor in a wood board and in another extreme of the board a suport for the byke cranks, then the compressor would be connected to the bike cranks with a chain.

I would just simply connect a small chair to the board so it would be above the compressor.
After sitting it would be a matter of cycling :roll:


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Re: I want a strong electric motor

Post by U.S. Water Rockets » Sun Jun 13, 2010 12:05 am

RaZias wrote:I was wondering where I can get a strong electric motor to replace the ones of those 12v compressors.

A 12V would be nice.

Any electric engineer around here that could advise me ?

Do some devices carry this type of motors so I can take them out ?

There was a recent episode of Mythbusters where they investigated "super hero" Myths. One myth they worked on was to prove that a handheld device could be used to shoot a grappling hook into a wall and could retract and pull a man up the wall, like Batman does.

In the episode, Jamie used a high speed electric motor and a reduction gear to increase the torque. He was able to hoist himself quite easily with his device. You should consider something similar. Look for a 12V powered electric router for the motor. It will be very high speed. Then find a reduction gear to multiply the torque while decreasing the RPM.

This should be the best approach.



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Re: I want a strong electric motor

Post by WRA2 » Mon Jun 14, 2010 4:45 pm

RaZias wrote:I also tough in puting a bycicle cranks in the compressor so it could be manualy powered :roll:
But I think doing the work with the hands would be hard.

I also could put the compressor in a wood board and in another extreme of the board a suport for the byke cranks, then the compressor would be connected to the bike cranks with a chain.

I would just simply connect a small chair to the board so it would be above the compressor.
After sitting it would be a matter of cycling :roll:
Using the bicycle drivetrain is a good idea. If you can find a multi-speed bike it would be even better as you could change to a lower gear as the pressure got higher and it was harder to pump.


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Re: I want a strong electric motor

Post by Jelo » Fri Jul 02, 2010 2:46 pm

plenty of choice for an elecric motor at towerhobbies, a radio control model shop :) brushed motors tend to be able to run in water, brushless are way more efficient but less resistant to water, make your choise!

BTW, great to be back :)


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Re: I want a strong electric motor

Post by U.S. Water Rockets1 » Sat Jul 03, 2010 10:33 pm

Jelo wrote:plenty of choice for an elecric motor at towerhobbies, a radio control model shop :) brushed motors tend to be able to run in water, brushless are way more efficient but less resistant to water, make your choise!

BTW, great to be back :)
Welcome back Jelo!

Hey... another motor that works great would be a motor from a car seat adjuster. You should be able to find them for a low cost at a salvage yard. Some of them have a nice worm gear and others have a cable pulling gearbox. You can use these to pull a release or open a valve remotely because they have a lot of torque.


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