Boat Builder Central - Builder Forums

Hi All,
I need to make a slite keel change, the swell in Sydney harbour can be a foot even at the best of times just floating AD16 of the trailer is not a good way to do it. I need to be able to allow the boat to slide of the back of the trailer and to be pulled back up again. Also our boat rams often leave a lot to be desired. Could a make the change as in the picture in my gallery .

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Thanx Sam

Yes, that is possible. It will change the LCR a little bit but I wouldn't worry about it.
That change does not affect the hull shape. Make a pattern to the shape you desire or just measure and build it the way we show but with that slope in the front.

Thankyou for the quick reply, I will make as per your design with longer slats so that I can achieve a slope that will work on a standard trailer

Sam

Hi Sam. I should have done something similar only in my case it is because of the seaweed I will collect. I just didn't ask. It seems to me that you could estimate the area of lateral resistance you are adding forward and then compensate for it by shifting the keel shoe back to make up for it. If you did this you would need to move the location of the ctrbd slot in the keel shoe accordingly.

Hi Bondo,

You did a great job on your boat, your a tuff act to follow.

As for the keel It should be OK, I am surprised it has not come up as an option before.


Sam

It actually has come up a time or two. The first AD built had a heavily modified keel and there was a picture or two. (the AD with the purple spinnaker shown on the plans page) and thanks for the compliment but you have to consider that I have completely overbuilt the boat. (I promised myself I wouldn't do that when I started)

I think we all overbuild from the plans if you took all the changes and put them in one boat it would not look like a AD16 at all. I like the idea of changing the keel box I mite try and do this as an add on this summer I could shape it out of foam and cover it with kevler that might work. The biggest problem I have found is in beaching the boat it dose a lot of damage to the keel box I have had to repair it a few times it just grinds through the glass easy to repair but a pain. I know just keep it off the beach.

I read that Jacques designed the keel shoe for beaching. More specifically "drying out". But I hear you Das Boot. Everyone has different conditions. What we refer to here in the N.W. as "beaching" is known in California as "hard aground". In Florida they call it "shipwrecked".

I plan to place a stainless steel band along it's leading edge to try and reduce the damage. I am not going to change the position of the CB or mast, many years ago I built a small skiff and stuffed around with the CB and mast and could not get it to sail right, won't do that again.

Beaching is not about sailing full speed up the beach
I beached my 41' boat often but always at very slow speed and no waves.
I understand that in some rare cases it must be done. I lived along a part of the coast in Belgium (De Panne) where small boats had to be beached at a good speed at high tide and were dragged on the beach by a tractor. In that case, you can change the angle of the leading edge.

About building stronger: please don't. I use very large safety factors to cover poor workmanship by inexperienced builders. Don't make your boat too heavy, you will be unhappy with the performance.

Thanks for the info it is not that I run it on the beech it is just the wave action that grinds away at it not I just anchor it off shore and wade to shore. As for over building I think most of us do this nor realsing that you had already built it into the plans good thing to know. I have been very happy with the boat and it gets comets all the time on how good and unique it is at the dock and even at the gas station while on the road it jus seams to draw attention where ever it goes thanks for the unique design.