Pennsylvania Statutes Title 35 P.S. Health and Safety § 1283. Engines; standards

(1) A model rocket engine shall be a commercially manufactured device or combination of devices wherein all chemical ingredients of a combustible nature are pre-mixed and ready for use.

(2) The force or motive power shall be created by a rearward discharge of gas generated by the combustion or other operation of materials contained solely within such device or combinations of devices.

(3) Engines for model rockets must be certified by the National Association of Rocketry (NAR) for sales and use throughout the Commonwealth.

(4) A model rocket engine shall be so designed and constructed as to be incapable of spontaneous ignition or combustion in air, water, under pneumatic or hydraulic pressure, as a result of motion or jarring, when subjected to a temperature of 170 degrees Fahrenheit or less, or in glycerine.