When practicing forced landings, you must ensure not to let the engine get to cool as ice is likely to form and cause an actual engine failure. Make sure to periodically warm the engine by using full throttle (normally every 1000ft). Again all forced landings should be made at either an airdrome or a designated practice area. The Canadian Aviation Regulations for minimum altitudes must be taken into consideration as well while practicing these maneuvers. Remember to stay safe!