So are you saying that the ideal weight for na F16 is more than an F18???? Taipan 4.9s are best around 120 kg and I would imagine that the F16s would be better suited to about 120 to 130. Sure you can race at 155, I raced the F18 at 184 initialy before we trimmed right down to 160. However we are still just a little too heavy for the F18.