I have 7 Cubs all together..It depends what you are doing with them , what they weigh , what your altitude is ,as to What kind of power they need..If you are bush flying or float flying at higher altitudes with more weight you are going to need more power...If you have a lightly loaded wing at lower altitude with wheels on a cool day you can almost fly a Cub with a rubber band..I think it wiser to advise somebody to slightly overpower a plane than under power it because under powering it will get you in trouble and could cause the loss of a plane ...