Abstract: In a method of coating a vinyl resin layer with a coating composition comprising a radiation-curable acrylourethane, a photoinitiator and at least one unsaturated addition-polymerizable monomer polymerizable with said acrylourethane and radiation-curing the coated vinyl resin layer to form a bond, the improvement comprising including in said coating composition a monoester or diester of phosphoric acid in an amount sufficient to improve the strength of said bond.

Abstract: Toy helicopter with a control unit which can be removed from the body of the helicopter and placed in one of several positions. The helicopter has a rotor blade which is powered by a motor connected to it via compound gears and a rotary driving shaft. The motor is controlled by a removable control unit which is inserted into the helicopter body and which has an activating switch. When the activating switch is pushed, the switch contact is moved into position to complete the circuit with the battery contact and the resulting electricity from the battery travels to the motor.The control unit is a self-contained unit which is connected to the driving mechanism of the helicopter by a wire cord which may be stored in the helicopter's body.