Good questions.  I'm just making the assumption that the design on Steinar's boat will work exactly as planned.  They may or may not work well, particularly at high speeds, but I'll go on hoping that they'll be great because there's so little that can go wrong with them.  I've been surprised before by people solving proa challenges that appear to have no solution, so there's no reason to bet against the bidirectional rudders.

  Yet.

  If they don't work out, I'd go with the flip-tiller 270-degree foils on the solitarry.

        - Mike

 

Is anyone actually using a bi-directional Speer foil?

If so, how nasty is the vortex shedding? Also does the feathering arrangement need any speed to reset its position after a shunt - meaning can the steering be left unattended during a shunt?

Rick

On 21/01/2014, at 6:26 AM, Mike Crawford <mcrawf@nuomo.com> wrote:

 Beam-mounted Speer section bidirectional kick-up retractable rudders, preferably using tillers with long extensions