M7 Aerospace SA 26-AT
(Merlin IIB)
with 5-blade
MTV-27-1-E-C-F-R(G)/CFR210-58d
more information (pdf 67k)

SA227-AT ( Merlin IVC) and M7 Aerospace SA227-AC ( Metro III)
with 5-blade
MTV-27-1-E-C-F-R(G)/CFRL250-103

The propeller installation is improving the overall performance, reducing the outside and cabin noise dramatically and giving the airplane a jet-like noise
signature.
more information (pdf 67k)
EASA STC