The 60/120 goldberg ultimate is one of the daddies pre ARF. It was the model that was used for ARFing; similar size,dimensions and weight. ie Look at the world models. U cant go wrong with any of em. Strap on a 120 engine either 2/4 stroke and keep the weight close to 8.5 pounds and it will be ballistic. No problem throwing huge props, loads of ground clearance.