This are went together with very little effort on my part.very well done product.I used a os 91 4 stroke a d the p,and handled it well.not for beginners as it does not se,f correct.but for the advanced flyer all I can say is it wants to do only what you tell it to do so it's all on you!e njoy this plane while they still have them I'm tempted to buy another as a backup.it really flies great.only mod was bigger tires.