This U-CAN -DO 3D is very good plane. made in China , I have prototypy of it ,just use .61 engine is enough to push it to sky vertical. if you want add OS FX 91 , I suggest you use 13*4 or 13*5 , this plane design for slow and very slow fly, I always happy with hung it and just few inch high on ground.

If you put 13*6 or 13*8, that will be to fast to you expecting .

pls try slow ,much more fun with this plane.

any question ,pls email me

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