> at 8:07 you show the front rudder is angled so as to turn the boat right.
> one continuous pan around to the stern rudder and we see it is angled to
> turn left. you are in effect then crabbing to windward, perhaps
> accidentally as there were two people helming, one on each wheel.
he is correcting her.
>
> judging by the boom angle you were close reaching at that time, which is
> consistent with your GPS track and reported wind direction. with an edit
> clip in the video, we then see the GPS reading 12+ knots. the boom
> appears to be at roughly the same angle. there was a gust then? the rest
> of the time you're only doing 8-10 kts.
right
>
> my question is, how big an angle are the rudders at when maintaining a
> steady course? in other words, are they big enough such that they can
> compensate for the weather helm and still be at the AOA which gives the
> optimal L/D?
don't know really, but quite small I guess
>
> relatedly, do you have any feel for how much sideslip there is? there is
> a tradeoff in the fore-aft position of the rudders between compensating
> for weather helm and compensating for sideslip. the further apart they
> are (towards the bows) the more a given AOA will turn the boat and the
> less it will counteract sideslip. the optimal fore-aft position will vary
> with wind strength and sailing angle of course. but is it in the ball
> park?
not yet and speaking for myself next opportunity I will try some close
hauled courses to see the possible tacking angle BD is capable of.
Making this vid of a nice sailing BD and having some uncomplicated fun was
the main goal last Sunday.
Henny van Oortmarssen
www.fram.nl