Newbie question please if i may?

[rubberball]

Sorry guys you are correct....I can program the FMC when powered up but i thought by the time i load up the aircraft with fuel/pax/freight
that the v speeds would be incorrect?

Thanks for all your help...maybe i was a bit vague in my initila post...i thought that yes i could input my speeds into the fmc but when i start
FSP and load it up thay would be wrong..and for some reason recntly i cannot take off without catching my tail...i have to use the trim on
my yoke to be able to take off even though i have set it up as per FMC...anyway guys thanks.

Regards Paul Teasdale UK