As quoted by Mr67Stang:
". . . This manual also says something about not using nylon props due to excessive vibration... I think that is a load of horse stuff but it's your engine."

As quoted in engine's manual (link given to me above):
". . . We urge that you do not use nylon propellers because their flexible nature causes more vibration."

Any other opinions on this?


Thank you MR67Stang for the info