There is reasonable flare and flam in the sections above the water line forward with modest tumble home in the aftermost sections. Below water the sections show firm bilges with good deadrise and a reverse turn into the rabbet beginning at station 4 and continuing aft to the stern. These sections do several things; this form gives strength and rigidity to the keel assembly, gives better depth beneath the motor thus permitting heavier floor timbers for the motor beds, saves a lot of useless timber in the shaft log and deadwood, and provides a better underwater form; better from both the standpoints of speed and seaworthiness. The bottom of the keel does not extend in a straight line to a point below the propeller. Breaking the line at station 9 and sweeping up gives a far better water flow into the propeller and also gives excellent protection to the tail shaft and propeller. If Tanja is grounded the rudder will clear the bottom by nearly half a foot; the propeller, too, will have adequate protection. One disadvantage of the metal shoe, which usually extends from the keel to the heel of the rudder, is that it is easily bent if it strikes bottom hard, damaging not only itself but the propeller and the rudder as well.

Tanja has flat buttock lines through the middle body, but is not of the wide and flat box stern model. Therefore she should not be over powered; too much power will pull the stern under and that will kill the speed. The plans show a most modest amount of power. The motor is a two cylinder two cycle slow speed Palmer, 4 to 5 horsepower at from 600 to 800 r.p.m. Weight is 280 pounds.