We thorouhly renovated my Rowsell built summer wine 3324 during the winter and she looked as good as new honest!The renovation involved a total strip of the decks which were then treated with 9 coats of eposeal and 3 top coats for the finish, the result was fantastic.
We have now sailed her maybe 30 times and just this weekend we noticed that the inside/inwhale of the deck structure, the pretty bit, two white wood stripes etc, where your calf rests when hiking has started to split along the join with the deck proper! help! in some places it has split along the join of the white wood stripes. Any one any idea what could be the cause and any advice as to the best solution to the problem thanks for any response Stewart

The cause is old age. The inwhalescarlinswhatever you like to call them actually take quite a lot of load. Almsot all boats of this vintage (Without stern tanks) seem to have the same problem.

The fix is quite easy. Put a stanley blade into the split to open it out and force epoxy resin in. Then wedge the inwhale back together using a prop and a conveniant land to apply pressure. If this is done well there will be no glue line.

It's probably a good idea to beef the join up is it's starting to go and there are two ways of doing this. The solid approach is to glue a piece of marine ply behind the inwhale under the deck. The slightly less agricultural way is to turn the boat upside down and put an epoxy fillet along the top of the inwhale where it joins the deck.

Since your problems are to deck ply level i'd recoomend the second approach

Yup, exact same thing happened to 3245. Its the cascamite giving up after 20 years. I took her to Laurie Smart, as finding a way to clamp the bits together was beyond my comprehension. Needeless to say it looks wonderful now.

Our problem is lack of dignity when coming out of the tack when I usually fall over! The reason for the cracks is flex in the inwales, so we are going to put small knees under the deck to support the inwale all the way. A doubler of ply behind didn't work in our case as the inwale will still "rotate" around the ply edge, although perhaps the ply wasn't long enough.

Save your back and do this with the boat upside down - means you can shelter from the wind and wife ..... (!)

The problem seems to be that putting downward forces on the lower edge of the inwhale gives considerable leverage to open the crack. To counter this you can use fillet or little knees as described. 2891 was redecked in '94  and has the other answer. not only is there a continuous wooden fillet along the join but the width of the inwhale has been halved. No hint of any movement.
 Surely no cascamite in 3245 as this was well into the epoxy era.

Well she seems to be giving way in various places with the usual white dust in the cracks.

I'm not convinced that epoxy was used throughout the boats construction by all builders until the late 80's. What looks like cascamite is probably the marginally better aerolite, but the effects are much the same and it fails in the same way.

I've certainly seen and done repairs on 33xx numbered boats that are classic aerolite/cascamite failure and it's usually on the decking.