ORIGINAL: bigwill5686
Which is better and why? I am currentally looking at a 2 stoke o.s. .46 and a 4 stroke o.s. .40. I am building my first arf, its a tower trainer mk II. Thanks for any help givin
Generally speaking you will need a .56 - .72 Four-Stroke to replace the power of a .46 ball bearing Two-Stroke. The .40 Four-Stroke will be lacking in that plane and give you frustrating performance once you have learned to fly.