Bob, I ran it on MotoCalc, using an APC prop. Also used a 4 cell 2500/ 20C pack.

It showed with a 9x4 the set up would pull 31.7 amps, provide 56.5 oz of thrust and a prop speed of 54 mph. Run time of 4.5 min.

On the 11x5 specs were as follows, 34.9 amps, 54 oz thrust, and prop speed of 42.5 mph, and a run time of 4.14 min.

Did warn that temps on pack would be getting up there unless it had good airflow over it.

BIG NOTE: Take this with a grain of salt, the only way to be sure is to check the set up with a meter at wide open throttle to get an accurate amp reading.
Then you can check against the calc program, and also verify if your pack is going to give you what you want, or what you are going to need capacity wise to meet your demands.