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A builder has just pointed out an error in the upper panel sizes. I suspect that others have seen it already but he is the first to point it out to me. The error applies to both the Skoota 18 and Chat 18. The correct dimensions are given in the attached drawing. However, as the plans say, make this panel over size at the transom and trim it back after fitting to your own boat. It also seems that Bhd2 could usefully be reversed so that the framing is on the forward side. Or simply add an extra 2inx1in on the inner sides to take the hull planking.


The aft cockpit bulkhead, Bhd5 should be as shown 


The bridgedeck reinforcing drawing was misleading, below is the revised drawing

The cockpit drawing has also been revised

Then the Chat 18 kingpost has been revised, shown in two drawings below


 We can send you revised pdfs of these images on request

You can use Nacra 5.2 catamaran rudders on a Chat 18 instead of the ones shown. 

You can use a swing down outbaord bracket instead of a nacelle. But make sure the engine clears the tiller bar when up and prop is at least 100mm in the water when at rest

You can use standard 75mm 3in glass tape instead of cloth. But use 3 layers each side and double over the lower chine joint when sheathing the hull

For those who are inexperienced or who prefer gentle sailing a smaller sailplan is now available, see below

Please contact me for pdfs of these drawings if you do not have them.