The rudder is a NACA 0013 with the aft end narrowing to the trailing edge about 4" short of where it should be. I suspect it was 0013 instead of a standard 0012 to allow a bigger shaft and higher angles of attack without stalling. To make it balance they shortened it in the fore and aft...
The "tall backer" definitely could not stand up in the boat, except under the open hatch, but he could sleep in all the berths! I think we agree that a bit more RM would allow more SA especially downwind, which is the boat's weak point.
The rumour about the rudder is that there was a mould...
Dash 34 - only built properly with vacuum bagging, modern rudder and keel foil, and a carbon rig. Still a great design (see the FP picture of Midnight Rambler which looks like a Dash 34 from above) but needed better execution than what was available at the time.