would this make any difference?

[B man]

ok so i just thought of a idea for a boat lower unit. twin props.

would this help? hurt?

what would it do?

a pic.

 

[Russ2251]

Been done.
DUOPROP
YouTube

 

[newrider3]

I don't think having the two props side by side would work unless you used some gearing setup to make them turn opposite directions. If they both turn the same direction, it can cause the boat to go sideways. Hence why twin engine boats almost always run one CW rotation engine and one CCW rotation engine.