I have a 1/2A Texaco model that weighs 19 oz. In trying to understand power to weight ratios better for electric models I ran the engine with a fish scale attached to the fuselage. The 049 running with an 8x4 made 9 oz of thrust. This 50% thrust to weight provides a nice scale like climb. A 56 oz 72 inch span electric old timer has a motor and prop that generates about 26 oz of thrust and climbs at a 20 to 25 degree sustained angle. Not far off classic cabin scale type performance. So from these two I would say that a 1:2 thrust to weight ratio translates to "nice" classic aviation type scale performance. From that you're looking for about 2 1/2 to 3 oz of static thrust.

Once you get the model built you can do the fish scale thing yourself. Or make up a little wheeled "car" out of some hard free rolling wheels attached to a plywood base and an engine pylon and use that with a scale for thrust measurements. From there you can get as fancy as you want in the design of a thrust test rig.