sentences:  Two further ground trials were made, one on 26 March, causing similar damage, and another on 2 April, when the propeller was damaged.After this trial Blériot replaced the frontal rudder with a large, semi-circular one mounted on a frame reaching behind the propeller, and added a fin to the underside of the fuselage in front of the wing.He also added a third wheel, placed centrally and under the engine.