Model 2 launches paper ball ,weighing 0.3 grams, approximately  4.5 yards. Model 3 shoots the same paper ball, 4.3 yards. Model 4 shoots the same paper ball 4.4 yards. Model 2 shoots a maker cap, weighing 9.7 grams, approximately 5.3 yards. Model 3 shoots the same cap approximately 5 yards. Model 4 launches the same cap 4.9 yards. Model 2 shoots things the farthest. By the way when we test are catapults we pull it all the way back to get the maximum amount of force. When you pull back model its about an 11 degree angle. Model 3 when pulled back its about 13 degree angle. Model 4 when pulled back makes an 30 degree angle.