Swim platform support calculations

[A1957]

I have a 36’ Tiara that has a 20” deep swim platform on the transom. I would like to increase this to approx. 48”. Currently, the platform is rock solid, is, no flexing when you stand on the edge. My concern is the extra “lever” a 48” deep platform will put on the transom and the support brackets.
The stainless steel brackets that support the current platform are positioned fairly close to the bottom of the transom so by adding a longer platform the angle of the brackets will need to be less.
Does anyone know how to calculate the increased “lever” or “torque” a 48” “arm” would have?

 

[tpenfield]

I did the calculations for my extended swim platform project.

You just need the angle, the dimensions, and an assumed load.

since the planned platform is 2.4 x the existing platform, factoring everything up by 3x is a good approximation.

 

[garbageguy]

Suggest sketching it up, to scale, get lengths and angles, this will help to set up some static-force calculations. I'd then apply a factor-of-safety in the calcs to account for unknowns, or "unsures", such as dynamic forces.

I think the above is from a person with real good analytical, and real-world experienc, of your situation. My input is just from a starting analytical point of view