Hi Rolf

I should have been racing but was in Northern Michigan , the Petosky -Harbor Springs area on a cottage design project , took my sons so we also got lots of great fishing, hiking, boating ,etc in .

Sounds reasonable -130 kilograms is equal to 286.60 pounds (avoirdupois)

A Marstrom weighing 231. Lbs would add 55 LBs to race equally in B Class.

The existing T weighs 376 LBs = 90 LBs more , is that a problem ,and would racing against 100 LB lighter boats make all Tornado's non competitive.

The weight at 286 Lbs may fit some requirements or planned cat designs but also make some obsolete.

Perhaps 286 Min weight with some sail area factor added for boats over 350 Lbs, that brings the next topic of sail area into play .

The Marstom has a 34'5 ft mast height .-The T 32 -the M has 22M mainsail of 236 sq ft --the Tornado has a main plus jib of 235 sq ft .

What sail area is ideal and what sail configuration -
main only -main plus jib -spin area -masthead spin ? 3/4 rig ?

A larger main of 236 may be ideal per M design , The T could upgrade to a similar size main , then use in addition it's jib to compensate boat weight.

A larger spin as well may also be considered.

The only other variation is a design formula rule like Am Cup uses .-An equation that included Length Beam Weight and sail area = xxx B Class number , the Texel rating power formula would be the base model but modified for B Class purposes, just a suggestion for discussion.