Climb at the recommended airspeed or in its absence at best angle-of-climb speed (VX), +5/-0 knots until the obstacle is cleared, or until the airplane is 50...

ATP Airplane ACS › III. Takeoffs and Landings › G. Confined Area Takeoff and Maximum Performance Climb (ASES, AMES)

Climb at the recommended airspeed or in its absence at best angle-of-climb speed (VX), +5/-0 knots until the obstacle is cleared, or until the airplane is 50 feet above the surface. In multiengine airplanes with VX values within 5 knots of minimum control speed (VMC), the use of best rate of climb speed (VY) or the manufacturer's recommendation is acceptable.