The first Detour of the season was a choice between Motor Head or Rotor Head. Neither the gearbox nor the rotor head could be recovered. Centering the patch is a top view of a UH-60 helicopter rotor head. The main rotor is fully articulated and has elastomeric bearings in the rotor head. His contribution to autogyro design included the "offset gimbal rotor head". The C.19 Mk IIA, introduced in 1930, had a longer undercarriage and improved rotor head.