Sorry I accidentally deleted this. Here's a repeat.

The boat does not have a keel, its a hull thats very simiilar to a "skimming dish" hull similar to an ILYA SCOW, sandbagger, or log canoe that uses centerboards (or bilge boards) to 'balance' the helm. All the ballast is in the bilge, the bilges are slack and rounded. These boats will 'easily' SKID if not properly handled and 'balanced'.

Such boats when above a beam reach need to be heeled over so that there is some 'surface area' from the immersed hull sides to resist the skidding off to leeward, as usually the centerboard is ONLY used to balance the helm pressure .... probably thats what the 'daggerboard' is used for when 'beating' and you 'can' keep that centerboard deeper and with more 'swing' forward and down.

Such a skimming dish-type hulled boat is set up to be steered by sail shape/trim and rig tension (as described in my previous post), helm pressure is adjusted (constantly 'tweaked') by varying the 'swing' of the centerboard .... the rudder (and that dagger board) are used for minor corrections. Most skimming dishes have TWO rudders so that one is always totally immersed/flooded to prevent 'cavitation' and loss of steerage due to the rudder 'ventilating' and sucking air.
Such boat will easily SKID off to leeward (and thats why sail 'shaping' and rig tension is SO important), but the skid will ALSO yield 'side pressure' on the rudder fooling the helmsman that s/he has so called 'weather helm' ... and the only way that one can tell exactly tell what is happening is to look at the 'stern wake'..... if coming off nearly straight, its a weather helm problem and you should 'adjust' the trim/shape of the sails; if the wake is coming off at a visible angle, its a skid to leeward and you should get that leeward hull deeper by increased sail pressure .... or reef. In both 'situation' the helm will feel exactly the same!
Motoring such a boat needs 'some' centerboard down to maintain course and directional stability ... otherwise with NO directional control shapes 'up forward' the bow will 'wander and swim' all over the place like the boat is a drunken elephant.

You really have to sail such boat like a dinghy with a swing centerboard .... and constantly adjust how much that centerboard is swung to maintain 'proper helm balance' .... and look out across the stern to see if youre skidding away to leeward or not.

Here's the info on this boat: http://www.mccubbin.ca/BlueWaterSail%20on%20P47.pdf

A good ILYA scow or Log Canoe crew would have such a boat 'flying' right from the dock .... but would be constantly 'tweaking' the angle that that centerboard is held ... for balance and to relieve 'helm pressure'. The 'faster' this boat sails, the more stable and resistant to skidding, --- betcha.