David,

I'm not sure what "short kit" implies. The Juno website does say that there is no hardware included, but other than that it sounds like the structure is all there. The OS .55AX is said to fit into the bolt holes of the .46. Don't have a .46 to compare to.. I assume the cylinder is slightly bigger, not sure about the backplate to driveshaft difference. I'm flying the .55 in a Sig Somethin' Extra now, which is a smaller wingspan model than the Tsunami, with no problems. 10% nitro, 11x7 Zinger.... it's pretty quick, but lots of fun to fly. Don't want to make a pattern airplane out of it ( the Tipo will be my pattern plane ), the Tsunami would be just a "show-off" sport/fun flyer.

ChiefK