1st bot

[Guest]

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lol. Does anyone know how i can measure how long a battery would last at a certain wattage and voltage etc.

[anukhet]

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quote:

so what weapon are we going to put on it
May I suggest using a gerbil so that it can gnaw your opponents into submission..... eventually

Not exactly Chompalot, more like Chewabit

[Guest]

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Can someone please tell me how i calculate how long a battery will last

[psychostorm]

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Heres how Id do it.

Volts= Joules/Coulomb
Amps= Coulombs/second.

For a 5 amp hour battery, that would be 5 * 3600 (secs in an hour) = 18000 coloumbs

at 30 amps 18000 Couloumbs (storage)/ 30 (rate) = 600 secs. Roughly 10 minutes.

Thats how Id do it anyway. Some1 is now bound to bring in an complex efficiency factor on the battery, but thats the basic physics.

[psychostorm]

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Though its not that easy with the hamster.. .

You cruel buggers. How can you expect a hamster wheel to spin at a 10:1 gear ratio? Even Im not that cruel to animals!

On the plus side, It appears to be the energy source of the future. According to Star Trek: The Next Generations engineering panels, a hamster powers the Enterprise Ds warp drive...

[Guest]

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i love gerbils

[Guest]

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Ok say i was gonna use four windscreen wiper motors what could i expect to get out of them e.g. speed rpm torque and what voltage etc. i need to use. Lets not have a discussion about weight etc.

[blazerbotics]

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I think they are about 150rpm when ran at 24volts, with a decent amount of torque. You would also need fairly large wheels (minimum of 200mm) and still would be slow.

[Guest]

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so basically you wouldnt expect to get much speed out of them but a reasonable amount of torque. How much torque would you expect roughly. Can they be safely run at 24v?

[typhoon_driver]

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mark you can get some decent speed out of them if you do what i am doing. Ive tore off the gearbox and am using cogs and chains to regear the motor. they can be safely run at 24v.

If you send me an email i can give you some pics and more info on what I am up to.

[Guest]

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did you get my e-mail gary?

[typhoon_driver]

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yeah sorry was runnning out the door jst after I posted. reply sent

[Guest]

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Right for a 4ch reciever do i need four seperate crytals on four seperate channels?

[team_ireland]

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Nope you only need 1 crystal per receiver.

[Guest]

1st bot

Could someone give advice on this setup-
4 wiper motors at 24v, gearbox removed like gary says, running off 2 12v 5ah batteries in parallel to give 24v. I plan to use 2x 30amp electronize speedos. Could someone say if this would work and maybe battery life i could expect and any other advise (not on weight). I obviously need to put each pair of motors in paralell to get 24v in them?