RE: pusher vs puller prop for single motor planes
It depends on how it is designed. Many full scale aircraft have left handed props. Most models have the motor set for right thrust to counter the torque effects of the motor and prop. If this model has that built in then a left handed prop will make it worse. But you can fix it by adding spacers on the right side to get it to have the same amount of left thrust. The only other difference is instead of right rudder on take-off you will need left rudder.