In memory of George Spratt, father and son, these “forgotten” figures in the history of Aviation :
www.georgespratt.org : A fine site which recalls in particular that the success of the Wright Brothers is due in a great extent to the researches of a certain George A Spratt.
Freewing : Worthy successor of Wright, this manufacturer of drones with “pivoting wings”, would do well to be more clear about where his ideas came, that is, the source : George G. Spratt.
Spratt, Schmittle, and Freewing Fine article illuminating the subject (+ this other revealing article).


Perfect engines for the Spratt 103 :
Honda GX 690      Honda IGX 800      HE Airmax 220