From all that I have read the stab on the reactor is 3mm think and the stab on the Reactor Bipe is 5mm think. This should keep it nice and stiff. Great planes also irons on the covering exactly where it needs to be on the Bipe while the Reactor has covering that needs to be trimmed. When people trim this covering they score the wood against that gain which severely weakens the stab. When building the reactor they now advise to wick thin CA over the cut line before installation.

I have flown full power into a dive to enter a blinder with no ill effect.