prop shaft down angle of 12° (+)

[vacendak]

may this be acceptable for a relatively heavy cruising monohull ?

[Pblais]

may this be acceptable for a relatively heavy cruising monohull ?

I'm not aware that it could make any difference at all or at least as one small bit of information goes.

[SkiprJohn]

Usually engines have a tolerance of 15 degrees. So if your shaft and engine are directly in line it should be acceptable.
Regards,
JohnL

[cat man do]

And here was me worrying about 4deg on mine without using a down angle box

There is an 8deg down angle gearbox, this would reduce the engine angle

ZF.com Marine Transmissions

[vacendak]

this is an electric drive, so there is no gearbox;
prop shaft is connected directly to motor shaft.

Will efficiency loss be significant if this system down angle is 12° ?

And: may some nowadays propellers (feathering or like)
partially compensate such loss ?

[James S]

I would think there must be some efficiency lost....but I suppose its like so many other aspects of a boat and would depend.
Hull shape
Hull speed
Prop shape
Prop speed
Do you have a choice? If not....Its fine!
Mine is about 3.5% but I see lots of tranys at around 8% so that degree is not uncommon....doesn’t mean its efficient though.