a 1977 nacra is likely to be a 17' nacra5.2 weighing in at 161kg

looks a little heavy by today's standards

but when hobie build a boat to beat it, the TheMightyHobie18, it weighed 181kg

and that's right where the F18 class desided to set their minimum weight of 180kg

by those standards a new, cheap, tough, alloy and glass F16 at around 120kg doesn't sound over-weightt