in 3D you want your airplane to be as light as possible and have sufficient power. These things aren't ment for speed obviously so, always use throttle managment. Try to get the most possible throw that you can. Props play some what of a deal. If you have the wrong prop is will greatly change your torque roll characterisitics. The 3D prop of choice is usually, large diameter with a low pitch, this gives you more torque, more vertical power, and it will slow the airplane down some what.