At least you know the boat worked with the original position of the rudders. The worst case scenario is building a mini beam at that position and transferring the rudders. As carbon pushes as well as pulls, the bracing only has to go towards the hull so the beam only has to be long enough to clear the rudders from the hull through 250 degrees of arc and the hull is already well supported in that area so little needs to be done on the inside. For that matter,you don't need a mini beam you only really need the bracing and connect it directly to the hull
My suspicions with a centreboard is that the set up would become closer to balanced so that the rudder does less work, but would be fairly sluggish trying to drive two points of sideways resistance.
--- In harryproa@yahoogrou
>
> 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@yahoogrou
> 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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