----- Original Message -----Sent: Friday, October 16, 2009 1:53 PMSubject: Re: [harryproa] Re: BD sailingHello,
We have two rudders 0.5x1.2m. We were able to sail over the Baltic and
back home with our setup. Upwind sailing was possible and the more wind
(speed)the easier it was. With both sails up we were able to sail higher
up to the wind. Upwind sailing with main only was easier when reefed,
better sail area/foil area ratio. The angle was poor when reefed, but
shunting was no problem. We had wind about 25knots.
Fast downwind sailing was also a bit uncomfortable. When the bow
submerged the stern tried to wander sideways. The helmsman had to stay
alert.
Light wind shunting is tricky.
I am going to add performance and make life easier by building two
daggerboards 1.5x0.5m symmetric sections. They will be situated +-1.8m
from the mast next to hatches. They are a going to be canted outwards
going thru the hull bottom in the center line. The daggerboard case will
make stairs down in to the hull.
Bulkheads for safety are needed.
Regards,
Arttu
> Hi,
>
>
> The second time we raised the jib I purposely kept sailing the same
course -close reaching- and didn't change the sheeting angle.
> Speed was something like 8 knots. The jib was hoisted while sailing.
The power and speed increase was noticeable, and along with it the boat
went out of control.
> I think power of the sail will always push the bow down causing the
bow to be the deepest part of the hull.
> Maybe the bow acts as a pivot in that situation and causes the boat to
turn upwind without lots of leverage at the other end?
> Another thing I noticed was that the front rudder had load on. In the
old set up the front rudder was hanging loosely in it's casing. We were
able to lift it at speed which I remember well as I was surprised by
that.
>
> regards,
> Rudolf
>
> ----- Original Message -----
> From: heinrich_meurer
> To: harryproa@yahoogroups.com.au
> Sent: Thursday, October 08, 2009 10:35 PM
> Subject: [harryproa] Re: BD sailing
>
>
>
>
> I was wondering why the problem increased with the jib put up. One
would expect the opposite. So what you are saying is that when you put
up the jib the bow gets more depressed while sheeting in moving the
lateral trim of the hull forward? Would the cure then possibly be to
sheet in very slowly to keep the bow up? Did the luffing become more
managable once you were up at speed?
> Heinrich
>
> --- In harryproa@yahoogroups.com.au , "Rudolf vd Brug" <rpvdb@...> wrote:
> >
> > Hi,
> >
> > The things that changed are :
> > Distance rudders from centre was 4600MM, now 3800MM. Also they moved
sideways 800MM to ww.
> > Fitted the electric drive with batteries weight max.
120kgs.(probably less)
> >
> > Rudders are smaller but the other setup worked also with blades
partially raised.
> > Also we sailed with only two of us, with the old set up there was no
problem sailing with six persons sitting in the cockpit, so well to ww.
> >
> > Thanks Robert, yes I was thinking just that. I am going to try to
temporarily fix an old rudder blade in the middle as a dagger board. I
think the bow down attitude of the boat with full sail up might be the
cause.
> >
> > regards,
> > Rudolf
> >
> >
> > ----- Original Message -----
> > From: Rob Denney
> > To: harryproa@yahoogroups.com.au
> > Sent: Thursday, October 08, 2009 11:08 AM
> > Subject: Re: [harryproa] BD sailing
> >
> >
> > G'day,
> >
> > Very disappointing. Could you make a list of the things that have
changed, please, so we can try to figure out the problem. eg, sails,
rudder location, rudder size, weight in ww hull, differences in water
drag, etc etc.
> >
> > Ta.
> >
> > regards,
> >
> > Rob
> >
> >
> >
> > On Thu, Oct 8, 2009 at 3:14 PM, Rudolf vd Brug <rpvdb@...> wrote:
> >
> >
> >
> > Hi,
> >
> > Yesterday we have been out sailing BD with the new rudder set up.
> > Wind about 16 knts. After hoisting the sails we pulled the sheet and
the boat luffed.
> > Pulled the other sheet to get the right bow pointing downwind and
sheeted in again, the boat luffed.
> > After a few attempts I descided to take the jib down, and we got her
going.
> > Rudder angle was about 10 deg. so no high speeds.We tried shunting
and we had to get BD going really downwind to be able to build up enough
speed to keep her from luffing straight into the wind.
> > After some time we set the jib while sailing on a close reach. Once
the jib started pulling the boat luffed into the wind the rudder only
putting the brakes on.
> > We took the jib down and proceeded without it. The front rudder has
to be pulled up at least half way to keep the rudder angle 'down' to the
10 degres I mentioned. Front rudder all the way down makes it hard to
keep the boat from luffing into the wind.
> > We also tried the front rudder tilted out of the water entirely
which made made for very nervous steering behaviour.
> > Returning to the marina we were very disapointed.
> >
> > As we brought BD to the marina after the launch we had to negotiate
some bridges and a lock all less than
> > 1 metre wider than the boat. I noticed that steering was less
precise compared to the old set up. Reaction is slower and seems more
abrupt, probably because the late reaction causes one to turn the rudder
further than usual.
> > Reactions please,
> > Regards,
> >
> > Rudolf
> >
>
>
>
>
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