The wild side of model helicopters is an NEX version of the P6 because of one number, lb/hp (pounds per horsepower).Pantera P6 with 55HZ - 7.5 lb / 2.1 hp = 3.6 lb/hp Goblin 630 with 55HZ - 7.0 lb / 2.1 hp = 3.3 lb/hp P6 NEX with 105HZ-R - 8.0 lb /...