To confirm, no aerobatic cert in this 150 HP modified Aerobat. Chris' airplane is a 1974 A150L, the only 150 HP Aerobats that can keep their aerobatic cert as part of the STC are 1970 A150K's.
One of the main advantages of having an aerobat airframe with the 150 HP engine is a wider green arc of airspeeds.
To compare:
1974 150L vs. A150L
Normal operating range (green arc)
56-120 mph vs. 56-140 mph
Caution range (yellow arc)
120-162 mph vs. 140-193 mph
Never exceed speed
162 mph vs. 193 mph
With the bigger engine, it's often possible to cruise in the yellow arc on the stock airplane, which of course you don't want to do in rough air, but you get that additional 20 mph of green arc headroom with an Aerobat. An honest real world advantage.
