I got out the illuminated magnifying glass last night and looked at all of Chapelle's drawings in _American Small Sailing Craft_ of the Hampden and related boats -- very nice stuff.
But you are right, the 17' at the TSCA event was far too heavy to row in anything but a dead calm, and launching was quite a project. His trailer had removable posts with balanced arms with rollers to fit under the hollows by the transom, and the whole rig had to go WAY down the ramp before the boat would float free.
"The enemies of reason have a certain blind look."
Doctor Jacquin to Lieutenant D'Hubert, in Ridley Scott's first major film _The Duellists_.