1/15HP is only about 50W. That's a pretty weak motor compared to the typical brushless motors used in RC.
I wouldn't say that brushed, 115V DC motors are uncommon but the motor controls available typically need 120V AC input. Finding a control for a battery application is going to be a problem -- I've never seen one. Also, brushed DC motors of this type are typically biased to spin faster in one direction than the other so if you do need to get that kind of speed balance you're probably looking at the wrong type of motor.