lol that calculator needs the power and weight. The program i used actually calculates the power output using info from the iphones accelerometer, and gave me a peak power rating of 18000 hp, and thats way before the plane even left the ground. The plane is a Boeing 767 300ER. My calculations for the planes weight, which factored empty weight, cargo, full fuel tanks and passengers/crew came to 180 tonnes. I can't have been far off because maximum rated take off weight for the plane is 186 tonnes, and the extra 6 tonnes could easily be accounted for if all passengers were overweight and had the maximum allowed luggage.
Also, remember that if the iphone program had been able to run for longer than what it determined to be a 1/4 mile, then the peak power figure would have been far greater still lol.