igavioli wrote:
I am planning to mount a bow thruster on a 41' Sailboat and i wonder if
someone
knows the influence of the tunnel opening at the bow. Namely how much
the created
turbolence will affect the performance of the sailboat.
In the Vetus Web site, as small as possible tunnels (possibly more than
one) are suggested just to keep the resistance under way low;
unfortunately this very statement
makes me worry!
Thank You. Claudio.

My semi-informed opinion is...not much. Water is incompressible, so the
pressure change across the tunnel opening will not be a factor. Here's a
good site on bow thrusters.

http://www.diy-boat.com/Pages/Archiv...e/upgrade.html