ESC for Heli 450 Class

Looking for recommendation for the ESC for Heli 450 Class. I have used the stock ESC from Align. It never works reliably under thermal stress. When will Align ever make one that’s does NOT need a heat sink attached?

Not much out there for 450’s without a heat sink. Unfortunately helicopters are severe duty compared to multirotors. Where a motor on a multirotor might be 500 watts or something for a big one, it is not unusual to see even a 450 helicopter hit 1,000-1,200 watts. 700 class heli’s can hit 10,000 watts. 800 heli’s, well…electric isn’t practical for 700’s much less 800’s.

So even like a Castle Phoenix Edge 50 has a pretty good sized heat sink on it. Otherwise they don’t last in helicopter duty.