Hi Greg I own a Xair I just correct you mine does cruise at 80 knots no problem. 8o hp engine is all that the xair will fit. They now are fitting the rotax 912. Xair have been brought out & are in the proces of moving factories hence the delay in supply at the moment. I have flown a Skyranger & both aircraft fly very similar, I nearly brought a Skyranger back in 2004 off Jean Cloude' what made me choose the Xair over the Skyranger firstly $$$ Xair was cheaper & what was included in the Xair Kit was an optional extra in the Skyranger kit. 2nd was the fuel tank setup, which I believe has been changed now. Both excellent aircraft the build is very similar. I think if you are in the market to buy you have to fly both aircraft & work out what suits your needs best no matter what kit you purchase you will end up with a excellent aircraft.
Hope this helps.
Tony