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A few years ago some kids I was working with were trying to outfit a LEGO boat with a paddle wheel and micromotor. While they were working, one kid got the idea that he was going to put a propellor onto one of the 4200 rpm motors, add wheels, and (...) (24 years ago, 29-Jun-00, to lugnet.robotics)
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| | RE: running the motors underwater
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I have run the Lego motors for long enough that they have gotten warm. This tells me that the holes you want to plug up would be needed as air vents. Not as much for circulation, but to let the air in the motor escape when it heats up and becomes (...) (24 years ago, 2-Jul-00, to lugnet.robotics)
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| | Re: running the motors underwater
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Are your tank filled with salt water? What is the electro-conductivity of your water? By the way, sinking a motor under water will damage lubricant inside the motor. I suggest you to pack the whole mechanic into a metal case, and seal the metal case (...) (24 years ago, 2-Jul-00, to lugnet.robotics)
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| | Re: running the motors underwater - update
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Just regular Boston water. God knows what is in it. Anyway, I decided to use the older 4200 motors for the submarine... don't need to gear up and there aren't as many holes to plug up. I covered the entire bottom of the motors in sealent/adhesive (...) (24 years ago, 13-Jul-00, to lugnet.robotics)
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| | Re: running the motors underwater - update
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Hi Ben It's great! It sounds like we both are using the same book... :o) I also did something similar (you can see some pics at brickshelf). When you say that you used the 4200 motor, is it the 'not geared down' motor? Are you using propellers to (...) (24 years ago, 13-Jul-00, to lugnet.robotics)
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| | Re: running the motors underwater
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Hi, I followed your underwater thread with interest. Today I noticed an underwater motorized propellor unit in the '99 Playmobil Add-Ons catalog. It might be adaptable, try (URL) and search for 'underwater'. Price: $5.59. It is a 1.5V motor and (...) (24 years ago, 15-Jul-00, to lugnet.robotics)
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