djwalker what prop are you running on your sx 50 ? I have one on my DP ultimate 40 and with a 12x6 apc I'm pulling a little over 6 lbs. of thrust with 15% nitro coolpower. It gives good vertical although not quite unlimited. I also have a Thundertiger g 51 on the gp 300s wunning an 11x6 apc it pulls about 5.5 pounds of thrust. the plane with everything waighs out at 6 lbs. 2oz and I had to add just a little tail waight. I was thinking about the saito 82a also but am still undecided if you know somebody who has one let me know how they like it. thanks