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Hi bellman, (from Doug BELL😉) This is another 'How long is a piece of string question'! Only way to find out is to build it, and do a payload test. Put weight in it until it floats to the waterline and upright and stable. I use chunks of lead and lead balls (fishing weights). Weigh the lead. Easiest way is to weigh the empty hull first, then again with 'payload'. Difference is your payload weight for the hull, including all equipment, decks, superstructure etc. Before you glue any other parts to the hull weigh them and subtract from the payload test weight as you go. When compete you should then know how much weight you have left available for equipment. Weigh the equipment; motors, shafts, electronics, batteries etc. Anything 'left over' is the ballast you need. Try to fit it inside as low as possible, the lead balls are good for final trimming. When all is correct simply pour a little resin over them to hold them in place. Only time I fitted ballast outside, a long steel bar keel, was on my U26 sub. But then U Boats had such an emergency 'drop keel' so it looked 'Right'! Happy building, Doug 😎
Young at heart - slightly older in other places 😉 Cheers Doug
With my sailing pilot cutter Cariad, when the hull was largely complete I put her in the bath an put weights in until the waterline was reached. I then weighed the weights. I then tried to make the bulb keel slightly lighter to allow for trimming.
I would make provision for the bulb keel at an early stage of construction. I didn't do this and it was a right pain!
Hi Bellman My Club sail several similar boats as well as an Ibex. They are all fitted with detachable keels which are fitted prior to sailing but can be removed for transportation and display. Our sailing waters are large and exposed and without the keels the models would not be able to be sailed. On the water the keels can not be seen.
I tried a long keel on my Cariad and it was not a success as the keel tended to keep the model in a straight line. I now use a detachable bulb keel.
The amount of lead will depend on your model and its overall weight. The bulb keels are a fibreglass moulding that we fill with lead to bring the model to waterline after inserting fore and aft threaded rod into the bulb. You will need to have holes in the keel to let the rods thro and long enough to be above the waterline. I fit a plastic tube and wood support inside. A washer and nut hold the keel in place. Before filling with Resin weigh the resin in the tin and remove that amount of lead from the bulb. Once set I use silicon to make a good seal between the bulb and hull and which remains attached to the bulb. Attached are pics of my Cariad.
Many thanks everyonefor the various advice I`ve decided on a bulb fin keel, when requesting advice on keel weight I should have mentioned the hull is 42in lg this was an oversight😋, I`m now drg.shadows from the plan quite a laborious task but interesting. bellman
Hi everyone, just hoping someone still reads this blog. I am just about to start building Cariad and have decided to take advice from this blog, and fit a detachable keel. This is my second build and first fiberglass hull so being careful thinking it through. it makes sense to design in the detachable keel before fitting the deck but clearly I can only measure the ballast - weight and position - once the boat is nearly complete. So id welcome some idea of the position of the false keel so that I can fit a tube now, and build the keel itself later. Anyone able to advise?🤔
Hi Samnewbie I have a Cariad which is wooden hulled at twice scale. I decided to use a false keel but as I bought the hull completed needed to retro-fit one. I agree with you! If you can fit the tube as early on as possible it will make life a bit easier. My keel needs to be about 12kg and the tube is a couple of inches behind the mast. I am still trying to cast the keel; I'm now on my fourth attempt!
I have calculated the keel weight and plan on it being about 1kg lighter than need be. This will allow me to finely trim the boat up once complete.
I'm going to cast a bulb which gives me some tolerance in positioning it on the keel to help with the final trim. Probably make the keel from two sheets of balsa with a central threaded rod screwed and epoxied to the bulb. But that's for a later stage, right now I want to build the shaft into the hull before fitting the deck.
Are you fitting an auxiliary motor? if so what sort of motor is most suitable?
Quite looking forward to starting but likely to hafe to wait until after Christmas - work intervienes
My first build was a Vic Smeed Starlet - just completed. Pretty straight forward but I over engineered it to try out some ideas - thinking the ideas through was great fun.
So although I will not start the Cariad until January I'm trying to explore problems now. The angle of the rudder shaft is one that I think I have a solution to. Take it right through the deck then put a handle onto it, hinged at the shaft so that it does not rise and fall as it is turned. Then a Bowden cable from each side of the cockpit to power the steering. I will enjoy building a mock up and trying it out!
As to the rudder, I am thinking of a detachable extension - downwards.
I'm also thinking about placing the prop to one side - perhaps more authentic but also well clear of the rudder.
One thing that I'm still thinking through is the access hatch. I see some builders move the dingy to the centre and create a hatch here but I like the clean decking on the original, with the dingy to the side. A hatch to the side would work for everything but the top screw for the detachable keel. Some more time dreaming up a solution.
You don't have to think too hard about the keel position at this time as the bolt does not need to be central to the length of the keel. Just choose a rough position and do your hole in the hull. Later when you know more about how much weight you need and where it needs to be positioned you just make the keel to suit the rod position.
To remind you - I'm about to start a build of Cariad - about a meter long fiberglass hull made by Chris Wynn-Brown. Selecting the auxiliary motor I'm looking at a m500 but any thoughts about the prop used. Thinking 2 blade fairly small, 25mm. Not needed for speed, just to get to shore if the wind dies. And originally auxiliary motors/props would have been small. Does this sound right? Sam