Swindy said.. Would the weight be you pulling against a 5m sail in 25 knots in logo high waves with a go pro mounted to the end of the boom with a scale drawn on the lense. This approach could probably take the rest of the season and several winter fronts to complete an accurate studdy.

I like your thinking :)
wind012 I am thinking needs to be same setup for consistency ie: done by same person back to back same day on same apparatus
Just boom across two saw horses with weight applied and measure deflection.
It would be interesting anyway