Grp morcambe bay prawner

Don't know if the OP has had any reply from other sources, but I saw a sistership today and took some of her "vital statistics". When afloat, she is trimmed by the stern in the normal Morecambe Bay prawner fashion: the deck edge is only approx 17" above the waterline aft , while freeboard at the bow is 39". Her draft aft is 3'6", and the top of her rudder is approx 5" below the waterline. So it sounds as though the OP's fine vessel is very light aft, and needs trimming by the stern by about 8".

prawner.jpg


Dom
 
Thanks very much for this Dom. boat stern gear looks just like mine.
Have you an inkling of how much ballast do you think I might need in the stern, and what effect it might have on trim, stability etc
very grateful for any advice
 
Sorry cannot help with the question of ballast but I am looking to buy one of these boats if anyone knows of one for sale?

Could you advise of the cockpit draining arrangement?

Mike
 
Hi
There is no cockpit drainage on my boat. The cockpit is very small and really is only a foot well as you sit on the edge.
I have built a 3inch upstanding around it to stop any loose water getting in.
The other thing is that when the boat is trimmed I should imagine the cockpit floor would only be just above the water line which would make draining difficult.
If one was to seal the cockpit somehow , if it were swamped , it is so small that that volume of water would not upset the boat I'm sure. Also I have no washboards so there is no interconnection with the cockpit and the cabin.
 
Hi John. There's quite a bit of buoyancy in the counter, which needs to be overcome, without lifting the bow out of the water. Ballpark figure, I would say you need about 900kg of additional ballast, low in the bilge, centred somewhere under the forward end of the cockpit. Easiest way to establish the true amount and position would be to invite 10 large friends onboard (who won't be too offended when you weigh them in public!), and move them around until you find the correct trim.
Try not to be tempted to put weight inside the counter: not only is this too high up, but weight in the ends will just increase "hobby-horsing" in a seaway.
You should find she will be much stiffer under sail, and will also motor to windward better, as the propeller is deeper.
 
Thanks Dom
That's really useful.
I did indeed have trouble motoring to windward last season in a chop.
I'll try to get that organised. There's some space under the engine in the keel I'll investigate
Thanks again

John
 
One of these vessels is advertised for sale in Liverpool/Merseyside. I note she is advertised as having 2 tons of lead ballast.

Mike
 
I have seen only 1 of these boats and the cockpit sole is 4 inches above the waterline. The cockpit is self bailing with the drains going straight through the hull under the cockpit. The result of this is that as far as I understand when heeled water finds its way up through the drains and into the cockpit. Not sure if this is ideal?

Mike
 
reviewing the ballast options- and having some idea of the amount of ballast needed- as provided by Dom- thanks again_ the long shallow keel is not going to be helpful with stowing this amount in an ideal position. I do have some space under the engine, but not much and theres not much space under the floor either.
I was considering using lead in say 2mm thick sheets to mould space efficiently into available suitable areas. if this is insufficient ill have to reluctantly raise the floor.
once again, if anyones got any wizard ideas let me know!
j
 
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