Propshaft Angle

[Salty]

How critical is the angle of the stuffing box and the angle of the prop coming out of the hull into the water? Is there a specific angle needed for mono's?
Obviously you don't want it parrallel to the water and you don't want too much of a downward angle but how do you know the best position?

[Fluid]

This depends on the hull. Most surface drive monos do run the shaft parallel to the water. The angle for submerged drives is usually defined by the motor mount position and the prop diameter. What hull are you rigging?



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[Salty]

Yeah mine is a submerged drive in a custom 36inch hull.
Thinking 0.13 flex drive with a X431prop.

So the angle is maybe not as critical as I thought it might be?

[Fluid]

Is this intended to be a fast electric boat? Mono hull I suppose? Deep vee or flat bottom or? A 31mm prop will not push that large hull very fast regardless of the motor and cell count - which would also be good to know. You'd want a minimum of 40mm, perhaps a bit more. But in general, the flatter the shaft angle the better.



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[CornelP]

If it is a submerged and not surface drive, you could get to scale speed with the 31mm, that is: not too fast...
Any pics? We could get a better idea.