PLEASE HELP!..speed 400 6V vs. 7.2V What does it mean??
Hi Jordan;
I'm fairly certain your nickel-cadmium (nicad) battery is
rated 1.2 volts per cell.
This number multiplied by 10 cells is 12 volts.
Because the one motor is rated at 6 volts, this means the
battery cells are connected in series-parallel to provide the
proper 6 volts required by the motor.
If you use the 7.2 volt motor with the same battery,
your speed will be lower and the motor won't be operating
at its full designed power.
The advantage the 7.2 volt motor has is lower current draw
for the speed and output power when operated at 7.2 volts.
So, by all means use the 7.2 volt motor if you can also
use a 12 cell battery in place of the 10 cell unit.
It's perhaps is a catch 22 at some point though, because
obviously you gain more cell weight by increasing to
7.2 volts.
I hope this is somewhat helpful.
John