The AFM for the DHC6 Twin Otter gives Vx and Vy for F0 only (with Vx=87 KIAS and Vy=100 KIAS, no flaps).
HOWEVER, Vyse is obtained with F10 (Vyse = 80 KIAS at MTOW), and confirming/selecting F10 following an engine failure after lift-off is the AFM procedure (F10 should already be selected, as it is the usual T/O flap setting, unless performing a STOL take-off).
