A viper entered an event as F16 will always have a TR rating of 102 double handed.
A rating of 101 single handed (not 100 as mentioned earlier).

Summary:
Every boat entered as F16 in open events will have a TR rating
102 for double handed.
101 for single handed.

When the boat weights 125 kg it will have a TR rating of 104 but it will NOT enter as a F16 to that event but as a Viper and will not sail in the F16 class of that open event. It will sail in the open or own class.

You need a measurement certificate for both configurations to show what the dimensions of the boat are.

When sailing an event with only F16's there will be sailed on elapsed time and NO rating is used.

Regards,
Hans