Date: 201907
Local time of day: 0601-1200
Location: ZZZ.Airport, US
Flight conditions: VMC
Light: Daylight
Aircraft: Cessna 150
Operator: Personal
Operating under: Part 91
Flight plan: None
Mission: Training
Flight phase: Takeoff / Launch
Reporter organization: Personal
Reporter function: Pilot Not Flying
Reporter qualification: Flight Crew Instrument; Flight Crew Flight Instructor; Flight Crew Commercial; Flight Crew Multiengine
Human factors: Situational Awareness; Training / Qualification
Anomaly: Deviation - Speed All Types; Deviation / Discrepancy - Procedural FAR; Deviation / Discrepancy - Procedural Published Material / Policy
Detector: Person Flight Crew
When detected: In-flight
Result: Aircraft Aircraft Damaged
Contributing factors: Aircraft; Airport; Human Factors
Primary problem: Human Factors

Narrative: Several weeks ago I had made to purchase Aircraft X.Two weeks ago I had engaged [CFI A]; based upon recommendations; I was told to me by local pilots that [CFI A] would be a great tail wheel instructor.I engaged [CFI A] for the sole purpose of safety. I felt it was prudent to go up with an experienced instructor and get comfortable and current with the aircraft. It is a tail dragger.[In the morning during our flight; CFI A] was demonstrating a soft field takeoff at a private turf strip. The 2000 foot runway condition was recently mowed and dry. During the takeoff roll [CFI A] held the tail down; [CFI A] was unable to achieve sufficient airspeed during the takeoff roll. Two thirds down the runway he jerked the flaps from 0 to 30 degrees. The plane lifted off but the stall warning was sounding and the indicated airspeed was between 0 and 20 mph indicated. He was struggling to keep the plane aloft in the ground effect. We never got above 20 foot AGL and he was unable to gain any additional airspeed and eventually fully stalled the plane into the corn field about one half mile from our departure point. The engine was producing full power and the fuel was about 1/2 full in each tank. There were no injuries but significant damage was done to the airframe and power plant.[CFI A] was deep into the reverse region of command where there was no escape. He is used to having much more power available; which may have bailed him out; but not this time.We secured the aircraft and insured the ELT was not activated; electrical and fuel were secured.During the previous hour we had done several touch and goes at [this airfield and another]. He was behaving hyper and aggressive; performing very low altitude 60-80 degree turns and requesting me to perform the same; I wouldn't; it was nerve wracking flying with him but I felt I was getting some valuable instruction aside from his aggressive demeanor. In hindsight; I should have fired him as soon as he was complaining to me about following the pre-start checklist. He acted like I was wasting time. We had about 15 gallons of fuel total when we started to insure we were within weight and balance. We probably burned 5-7 gallons during our flight.




Synopsis: C150 pilot reported that; while receiving instruction on short field takeoffs; the instructor pilot stalled the aircraft into a corn field; damaging the aircraft.