Sailboat large angle of stability appendages

Hi guys , regarding the calculation of large angle of stability for example using Maxsurf the appendages volume of a keel bulb needs to take into account ? Thanks for the clarification

 

My opinion is that you have to consider it. Not only for the calculation of stability at large angles, but also for calculations of hydrostatic values.
In general, it is assumed that errors in calculations of up to 2 or 3% are acceptable, but if the keel volume is greater than that percentage, with respect to the submerged volume, failure to take it into account would introduce too large errors.

 

Thanks, it is 40ft boat with a bulb keel and the difference is 100mm on Gz and 8 deg on angles if the complete keel bulb and relative ballast is considered or not.Anyway i am agree with you but checking online o have seen report without keel displacement

 

They are two different things, but closely related. You can take into account or not the volume of the keel and the bulb but you must always take into account its weight to determine the c. of g.

 

Yes sure the weight of the ballast and keel structures needs to be always into account of full displacement

 

Yes, completely sure.
Not only full load displacement, it is an important component of the light ship weight.