Weed Eater http://en.wikipedia.org/wiki/Weed_Eater
The term now is used to describe any brand of string trimmer used for landscape work.

Most have two stroke engines that use a mixture of gasoline and oil. They can run upright or inverted since they do not have a crankcase full of oil.

As redfox435cat suggested, if you can build a plane similar to any of these http://www3.omnimodels.com/cgi-bin/woi0093p?&C=AAB and install a 6.5 to 9 cc glow engine it will be much easier to get started.