I have a 10hp Saab propulsion
setup in my 10 ton sailboat. An auxiliary power unit to say the least. My speed is pretty slow. Last summer I had a diesel mechanic
glance at my prop and say the blades are backwards. Its a 2 blade
feathering Saab prop. Now I have two situations:1. the prop blades were installed backwards (the number didn't line up), 2. the blades have a 10 degree bend (not pitch) to them, not like a traumatic damage type of bend but rather a deliberate manufacturing type of bend. if you imagine an animated cartoon
of a boat traveling super duper fast and the blades are bending backwards from the extreme speed of the boat then that is what mine remind me of (I actually wondered for a moment if that happened)
. I have looked at 4 other Saab feathering props in the yard and they are all straight.
So, to set things right I switched the blades around to line up properly with the numbers but then the bend in the blades are facing forward. I shrugged my shoulders and put the boat in the water
hoping that maybe i remedied a problem the previous owner was unaware of. However, the boat is agonizingly slow and I have no knowledge of its performance before I changed the prop.
Anybody have any thoughts about the bend, performance, cause, solution?