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Step 2The Base
The base was made out of some wood scraps to make an 12"x15"x4" box with an open ended bottom. Make sure its large enough to allow for whatever you want install in it. I wanted speakers but I ran out of room.
I located the center and drilled a hole to provide a pass though for the pivot post of the skeleton of the rat. I also cut a small arc in the top to allow the tubing and wires to slide around when the rat rotates.
You need to find or make something to mount the internal skeleton to that will allow the prop to rotate freely about 45 degrees. The bottom part of the metal frame is attached to that. I used a flywheel from a very old VCR but you can make something similar with a circular peace of thin wood or hard plastic and a thin bolt passed through and some washers. Think lazy susan. This provides a rotating platform with center bolt that can be used to rotate it from below, with a servo. The picture shows the bottom part of the frame already attached to the rotating part and passed through the top of the box.
Inside the base is mounted the radio receiver and 2 servos for the rotation of the rat and activation of the water pump, the water pump was ripped out of an old leaky squirtgun. The power is provide by a battery pack with 4 D cells to provide 6 volts for the radio receiver and the water pump. The water reservoir is a sports water bottle with some pluming installed. Make sure you drill a small hole in the cap otherwise you will get a vacuum lock when the pump starts running.
I located the center and drilled a hole to provide a pass though for the pivot post of the skeleton of the rat. I also cut a small arc in the top to allow the tubing and wires to slide around when the rat rotates.
You need to find or make something to mount the internal skeleton to that will allow the prop to rotate freely about 45 degrees. The bottom part of the metal frame is attached to that. I used a flywheel from a very old VCR but you can make something similar with a circular peace of thin wood or hard plastic and a thin bolt passed through and some washers. Think lazy susan. This provides a rotating platform with center bolt that can be used to rotate it from below, with a servo. The picture shows the bottom part of the frame already attached to the rotating part and passed through the top of the box.
Inside the base is mounted the radio receiver and 2 servos for the rotation of the rat and activation of the water pump, the water pump was ripped out of an old leaky squirtgun. The power is provide by a battery pack with 4 D cells to provide 6 volts for the radio receiver and the water pump. The water reservoir is a sports water bottle with some pluming installed. Make sure you drill a small hole in the cap otherwise you will get a vacuum lock when the pump starts running.
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Mar 12, 2009. 6:33 AMoperationivy123
says:
hey man, i don't really get how the water pump works? if you could explain it to me that'd be dandy and if you have a parts list that would also be pretty sweet
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