MAXIMUM G-LOAD: Plus 6 and minus 3 G's for an RV-4 or RV-6/6A flown at an aerobatic gross weight of 1375 lbs. (1600 lbs. for the RV-7/7A/8/8A. or 1050 lbs. for the RV-3 The RV-9A has a maximum G load of +4.4 and -1.8 at 1600 lbs.). For operational gross weights above this figure, aerobatic maneuvers should not be performed. This also assumes that the RV was built in strict conformity with the plans. Any variation in materials used, dimensions of primary structural parts, or workmanship standards, can cause a loss of strength and cause the actual limit load to be less than the design limit load.