RE: Eflite T34 Mentor
That depends on how rough the grass is. Look at the wheels. Look at the grass. If the grass is higher then the wheels you are going to have a problem.
You can try putting on gigantic foam wheels, but if the grass is more than 1/2 the height of the wheels you will likely have issues.
Do you have a problem with hand launching your planes? I take the landing gear off and hand launch all the time.