As I will likely be making my first venture into the Experimental world after 40> years of flying with an RV-4 purchase, I am as usual a bit confused. So, does the definition of gross weight and it's legal implications change since the aircraft is certified in the Experimental category? Some are 'certified' with 1500 gross, others with 1600 lbs. I am aware of the fact that aircraft can be safely operated above published gross weight (Alaska FAA regs allow a 10% increase in some situations..) and that yes, once must be careful as always. Results may vary, this is not advice from me, and this remains between you, me, and the NSA. I also know ramp checks can be very rare but one must always be prepared, and that was not the reason for my question. I am just continuing on the path of knowledge to some day reach the lofty goal of being an RV-4 aviator. Thank you very much.