A dusting drone or quadcopter, especially to reach high light fixtures. Or a window washing/gutter cleaning copter.
By madrocks
Other robots from Synthiam community

Buratino's Basilio
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Tachyon's First Robot
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Jim's Ezbv4 Robot Lawn Mower
When I decided to design and build a remotely controlled lawn mower, there were two main requirements that had to be met...