Static thrust is on the order of 2x or 3x the shaft horsepower of the engine.
I remember being told that the thrust to weight ratio of the FR-1 Fireball with a light fuel load was around 1. Even if I factor the thrust of the J31 into the equation (~2,000 lbf) that would give the prop about 4.5 pounds of thrust per horsepower for it to be around 1:1 with a very low fuel load.