Lightest engine to hover 5.5lbs?
Ah, Robert, I missed your post while I was writing mine.
You can't be serious! 10 pounds of thrust with a YS 63???
Oh, and Kris1, meant to say I fly a Limbo Dancer (kit) that weighs 4 pounds (plenty of repairs!) with a Thunder Tiger 46 Pro which has gobs of power and hangs easily, which is why I thought a .53 would lift 5+ pounds. Doh! Wrong again Sherlock! :-)