I got the following weights from several sources:

Marstrom Tornado kg 41,5 (+/- 0,4 Kg)

F18 Kg 43-49
(Capricorns of the high end of the range/don't know about the Infusion).
However it was quite often measured a difference of up to 3 kg between two F18 hulls of the same builder.

F18HT kg 30-33