McCulloch: it's not the first name to spring to mind when you think of aviation, but it's not a name you should ignore, either.
The McCulloch Motors Corporation was founded in 1943 to make small two-stroke gasoline engines. Initially known for outboard boat motors, today McCulloch makes engines used to power lawn and garden equipment. During the company's first three decades, McCulloch also made small aviation engines, most of them used to power military target drones. Their aviation engines, like their outboard motors, were two-stroke designs and came in horizontally-opposed two-, four-, and six-cylinder configurations. A number of these reliable little engines have been repurposed to power manned experimental aircraft. Here's one I photographed at the Pima Air & Space Museum today:
McCulloch TC6150 target drone engine, circa 1965, Pima Air & Space Museum (photo: Paul Woodford)
The really interesting stuff is below the squiggle ...