Aeroplanes with less than the Wrights' 12 horsepower?
The Wright Brothers' 1903 Flyer flew on the 12hp generated by Charlie Taylor's engine. I wondered what other self-launching, man-carrying aircraft have flown since on the same or less horsepower? To narrow it down, lets exclude man-powered aircraft. So far all I can think of are the English Electric Wren (404cc ABC 7.5hp) and the Abbot Baynes Scud 3 or Carden-Baynes Auxiliary (250cc JAP 9hp).
What others are there?