Weedeaters are a lawn care tool that consists of a small gasoline engine, a wand and a spinning disk. Usually, the spinning disk has nylon string attached -- it is the nylon string that actually "eats," or cuts the weeds. When Weedeaters wear out, there is usually a perfectly good, small gasoline engine sitting in the garage waiting for a DIY project. You are only limited by your imagination, but there are several projects that others have already field tested.
You can use a Weedeater engine to motorise go-karts, skateboards and razor type scooters, although the first will probably be underpowered and the last two will definitely be dangerous. The ideal vehicle to put a Weedeater motor on is a bicycle. The engine can be mounted almost anywhere on the bicycle frame. You will need to take the spinning disk off the engine shaft and replace it with a spur gear. Run a bicycle chain around the spur gear and around the gear on the hub of the back tire. You can take off or add links on the chain to make it fit.
If you replace the string spinning mechanism with a propeller, a Weedeater makes an acceptable outboard motor. These are great for sailboats -- especially effective for docking with the sails down. Because the "outboard" is not mounted you can turn the apparatus to move the boat sideways or in reverse. It is also good for coming back to dock if the wind gives out. These Weedeater outboards are also handy to have on a fishing boat if the main engine gives out.
A small Weedeater engine makes an acceptable power source for a remote control (RC) aeroplane or helicopter. These engines are usually aluminium, so they are light enough for flying machines. The Weedeater engines are much cheaper than the standard RC aircraft engines -- especially if the engine was just sitting unused in the garage -- and they do not need special fuel as RC engines sometimes do.
Other than powering vehicles, there are several more popular Weedeater motor projects: blenders and battery chargers. A gasoline blender is handy for camping, tailgate parties or a day at the beach. Mixing up a batch of Weedeater margaritas is a good way to make new friends. Connecting an old Weedeater engine to an old car alternator -- which you can buy cheaply at any automobile junkyard -- makes a simple battery charger. They are much smaller and cheaper than commercial batter chargers and easier to repair if they stop working. When the Weedeater battery charger stops working just replace one of the two inexpensive parts.
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