My son and i working school project just can't to get voltage out of
the panels to kick start two 3v solar motors using four panels
I hope you have some kind of a multimeter. How much voltage and
current are you actually getting out of your panels? How much
voltage and current does it take to run the motor, for instance from
a set of flashlight batteries?
do we have build a linearer regulator or can i just bridge rectifier
Neither of those would help getting more power out. A linear
regulator would help if you are getting too much voltage for the
motor. A rectifier would convert AC to DC, but that's not your
problem as the panel already puts out DC.
Only if the motor requires AC. If so, your life is more
complicated.