[BELLATRIX1965]

Greetings! Does anyone have experience with the Hydralign (Australian) feathering prop - especially the 3 blade "Aperture" model? I hope to replace the original fixed 2-blade prop on my 1965 full-keel sloop. The old girl is fine powering ahead, but astern thrust is almost non existant. I don't think that the Max Prop or Kiwi Prop or Autostream will fit without re-designing the rudder/aperture. Thanks in advance for any words of wisdom!