Directional drilling apparatus comprises a drill string having coiled tubing (10) which extends down a bore being drilled and which is uncoiled as drilling progresses. A leading end of the drill string carries a drilling motor (28) having a body (26) and a bit (32) rotatably driven with respect to the body (26). The bit (32) and the body (26) are out of alignment by a bend angle (38). A multi-plate brake (42) activated by a piston (44) controls relative rotation between the motor body (26) and the coiled tubing (10) in order to control drilling course. <IMAGE>
