Why Do Parallel Running Marine Alternators Desire to Have the Same Power Factors?

This would imply that the marine alternators were the same size, in parallel, and consequently load sharing.

Why would you expect something different?

once you cross the International date line they spin backwards

No silly, it's the equator!

Maybe an alternator psychologist could figure out such desires.

Load is floted in ratio of Capacity of Generators on parallel running generators of same capacity, if there power factor is not equal, the load could be imbalanced and this is a chain action, in which one generator will buck up / heavily loaded and Harm and Stall, this will effect the other generator and could be over loded and Stall. So Floting The Load has to be by Generators of similar capacity and Similar Power Factor.

During my military service i had a duty assignment aboard a nuc sub. One of my jobs was to bring a turbo generator online and in sync with the currently online tg. In my schooling i was told if i coupled them too far out of sync they would rip themselves from their mountings and roll down the inside of the sub,probably killing us all.I never tried to find out if it was true.

Really good idea not to. If they didn't rip out and roll down the inner hull, the Head Scotsman In Charge of the boat would have chewed out around you, and let you fall through the hull, then he would spit down the hole you left behind. Go Navy!

Thank you for your service to our country, sir.

Sometimes I see some of our CRO's lining up a steam turbine - generator with the grid, and the sync scope is not cooperating with them, and it really irks me when they "punch it" to latch when the needle is not TDC, and the indicator lights are dark. Glowing is bad.

Glowing in the dark is a really bad day.

By definition of parallel running - they are both attached to the same load, you silly man.