Skyhawk 172/Cutlass 172
Flight Crew Multiengine; Flight Crew Instrument; Flight Crew Commercial; Flight Crew Flight Instructor
Flight Crew Last 90 Days 42; Flight Crew Total 550; Flight Crew Type 109
Aircraft Equipment Problem Critical; Ground Event / Encounter Ground Strike - Aircraft; Ground Excursion Runway
Aircraft Aircraft Damaged; Flight Crew Took Evasive Action
Aircraft; Human Factors
On takeoff roll the student pilot pushed in full throttle; the airplane accelerated slowly and the airspeed indicator was slow to move. As we moved down runway we had used more runway than a normal takeoff. The airspeed indicator was around 50 KIAS when I decided to abort the takeoff. We had used more than half the runway.I took control from the student pilot; and the airplane lifted into ground effect. I lowered the nose and simultaneously pull power to idle. We touched back down and I applied maximum braking. We ran off the end of the runway and into the grass clearing. As we were coming to a stop the nose went over a small ditch and we came to a stop nosed over. The prop was stopped; I pulled all fuel to off; removed the keys and exited the airplane with the student.When we exited I asked the student if he had any injuries; neither of us were injured.
C172 flight instructor reported a runway excursion following an aborted takeoff due to lack of acceleration.