I have a YS 63 in my Banshee, about 5.5 lbs and is more than enough motor for all 3-D using 14X 4 apc. Have YS 110 in U Can do 60, about 7.5 lbs, almost tooooo much motor use 14 X 4 apc. The 63 will out do the sato 70 by a bunch, not sure about 90. Hope this helps?