putzing around with some interesting measurements
Kurt, take note:
Made a pattern of the exterior shape of the Ariel cabin in the space between the hatch and the maststep. And drew it out full size on paper in the garage. 338 has a larger hatch base so the rather arbitrary space is smaller, probably closer to the maststep.
49" - Width of cabin just forward of mast and just above the deck/cabin curved 'fillet.' It's a level line thru the cabin, if you will.
The next three are the 'interesting' ones.
83/84 degrees - Angle of sides off the horizontal 'level' base line established above. Slope of cabin sides. Not off deck.
106 degrees - Estimated angle of cabin side to a half chord from the centerline of the cabin arc. IE making a straight line to the middle of the cabin crown from the top of the cabin's rounded corner.
13" - Estimated height of cabin off the arbitrary horizontal, be more if deck and cabin met sharp.
Al Mason's Pootsy, measured off a single sheet drawing got thru dngoodchild that was reduced to 1/12. IE to a 6 1/2" drawing representing a full size 6 1/2' pram. You need a downloadable 1" (12) = 1' scale rule.
37" - Width of transom.
83/84 degrees - angle of sides to waterline at the transom. The angle changes at the other stations, which is expected.
106+ degrees - angle of sides to bottom at transom.
14" - height of transom in the center.
This curious coincidence is pretty amazing to me. Certain shapes and proportions must please the inner eye.
Kurt, you got a good eye!:D
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Made some scale drawings. It IS possible to imagine an extremely wide pram. I can - I'm large and fairly heavy. Be actually easier for me to row it. However, realistically, we're shouldn't expect to have a pram that is 50+" wide to lower over the cabin. The reason is we have the structure of the pram transom to consider, the transom won't be there when the pram is lifted. Have to find and fit the transom and fiddle with fastenings! What narrow framing would be strong and stiff that the removable transom is attached to? It's the integrity of the pram at the transom that bothers me if we really want to french the pram to the cabin.
There is the traditional rear seat of a pram to think about and the raising of the hatch for venting when it's upside down on the boat. The seat is important for structure and can be made hollow for flotation. So if anyone else is visualizing this conundrum, to me it's obvious that the pram has to ride higher. Therefor it need not be as wide. The arc of the cabin is 2" - not radical. It's not a bad concave shape for a padded transom. The narrower the transom the higher it sits. The forehatch has to be operable and the little side ports would be usable. The transom would not need to be so compromised, making the pram stronger. Just exactly what, we'll find out with a scale model if I ever get around to it. NOW, whether the pram transom would actually fit the prescribed space between mast and hatch has to be determined - probably on the boat. Niche fitting often does not work out. Any thoughts, even negative, would be really appreciated.
For me, Pootsy could be made wider and a little deeper by adding a piece down the middle. I would attempt it in a stitch and glue adaption. A wider pram would fit pretty well on the foredeck. If it did work out Pootsy would obviously become Puttsy. (Oopsy and Poopsy also come to mind.) Don't know that Al would approve!? Don't know what the width limit is yet. Or even the exact length.;)
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Aussie Take On The Subject