 The Merlin's fuselage and vertical fin represented Swearingen's contribution to the overall design.The next step was turbine power, through the SA26-T Merlin IIA with Pratt & Whitney Canada PT6s and the follow-on SA26-AT Merlin IIB with Garrett TPE331 turboprops.Next came the all-new SA226-T Merlin III with new wings, landing gear and cruciform horizontal tail mated to a slightly stretched version of the fuselage used on the Merlin II series.