Unlike my personal helicopter idea, this one is actually gonna materialize (sometime soon, anyway.
I am taking a mountain board (like an oversized skateboard, here's a picture: link
) and adding an electric motor and batteries for propulsion.
The motor I have already received and is .5HP (about 400 watts) at 24v. It draws 1.7A unloaded at its top speed of 3000rpm. It is brushless and has a built-in motor controller, so all I have to do is apply power and a pot to get it going.
For the battery I am getting a LiFePO4, 10Ah, 24v battery pack. They're lighter than Ni-Mh and cheaper than Li-ion while still having a good power-to-weight ratio.
The mountain board I am getting is used and cost me $35. It is being shipped as you read this.
I will need to learn how to weld for this, so that'll be a fun experience.
And just to prove this isn't all just a bunch of talk, here are some pictures.
I am using a 10A ammeter which will hopefully give me an idea of how much ride time I would have left at that moment. And look cool.
Kinda blurry, but you can see about 1A being drawn from the motor.
The crazy setup I used with some terrible lead-acid batteries for testing.
The meter came from a battery charger and had the needle centered in the middle. I turned it all the way to the bottom and added a new decal.
After. For some reason, my printer is freaking out and printed blue and pink instead of green and red. 0_o But, it's still fine. (I will explain the LED in a moment.)
I am making a box to hold the connectors, fuse holder and ammeter. I decided to build a key-start system because I had the stuff lying around. Here is the inside of the box with the key disengaged:
Front of the box. The ammeter has a UV LED in it for coolness and to make the needle glow.
Also a green LED for power indication.
IN THE DARK OH YEAH
Here is a nice shot of the motor I'm using:
And here is what will control the movement. An Atari paddle controller. The fire button (taken out in this picture) will have to be held to activate the motor (so it's also a dead man's switch) and the knob will control the throttle. I might add in some kind of spring return on it, but we'll see.
Once I get the board I can measure the tire size and figure out a proper gear ratio to get a top speed of about 15-20 mph.