Flight Instructor with trainee lost power in their C152 shortly after takeoff. The instructor managed to land in a nearby field. No injuries or aircraft damage.

Narrative

Substantial power loss on takeoff. Met with student called and got a weather briefing. Ceilings were approximately 4;100 ft. above ground level with a scattered layer at 2;000 ft. above ground level winds approximately 160 at 10 kts. and light precipitation to the southwest of the airport. Pre-flight with student determined no abnormalities and there was 5.5-gal gas in right tank and between 7 and 8 in the left tank. This was to be a short several pattern flight of less than 1 hour. Engine run-up determined that all systems were normal. The flight departed and we did 3 crosswind touch and go landings all seemed normal. On the fourth; flaps were retracted; carb heat turned off and power was applied. The engine seemed to be producing normal power and we lifted of at approximately 55 kts. near the intersection of or just past XX Taxiway. At approximately 100-200 ft. above ground level we experienced an unexpected substantial loss in engine power. I scanned the flow items for engine failure. The flaps were in the up position; mixture was full rich; primer in and locked; mags were to the both position. I promptly pulled carb heat on and noted no improvement. It was at this point that I had to make a decision to continue on with limited power or close the throttle and land. We did not appear to be climbing and I wanted to land the aircraft in a controlled fashion; so I pulled the throttle to idle and deployed the flaps to full 30 degrees in an attempt to get down quickly and stopped before the tree/fence line. As we approached; I noted that we would not make it stopped before the tree/fence line; so I altered course to the right lowering the nose of the airplane in an attempt to maintain safe airspeed. As we paralleled the tree/fence line we came to a landing in a field of soybeans in a controlled fashion. The propeller was still spinning at this time; and I pulled the mixture to idle cut off. The engine did not quit so I turned the fuel selector to the off position and pulled harder back on the mixture. The propeller then stopped. The Tower Controller called for us on the radio and I replied that we were on the ground. I then told my student to exit the airplane and go towards the tail in an attempt to get away from the propeller and engine just in case there was a fire and I finished shutting down and securing the avionics. I tried calling the Tower by telephone but could not get through; I then called the owner of the flight school to tell him what had happened; he asked if everyone was okay and what had happened. By this time; I could hear the emergency vehicles in route and tried calling the Tower again by telephone. I did get through this time and told them that we were both okay. While waiting for the Authorities to arrive I took the cap off the right fuel tank (the lower of the two) and noted approximately 3.5 gallons of fuel. Authorities and fire arrived; they asked if we were okay and what had happened. The officer on scene had contacted the FAA before he allowed the airplane to be towed back to the maintenance hangar. The airplane was upright with no apparent damage. The fuel selector was left in the off position; carb heat lever in the on position and the flaps left in the full down position.