Doodle Bug - By William D. Jackson. DOODLE BUG is a trim, single cockpit, outboard hydroplane with a new type of convex bottom and non tripping chines which combine to produce a remarkably fast boat with excellent maneuverability. Any outboard motor from 9 to 25 h.p. can be used to power Doodle Bug for thrilling speeds, miles faster than most present day factory made craft. The design was evolved by selecting the best points from a series of small hiydroplanes and building them into this one boat. And, before offering the boat to SCIENCE AND MECHANICS readers, we built and tested two of them, both of which perform beautifully. The tails at the transom which produce the unusual streamlining effect of this attractive speedster may be omitted if you wish but our tests indicate that they improve its operation, and should be left as an integral part of the boat.