A chubby radio controlled boat with counterintuitive design sets its sights on outperforming a slender research catamaran.

MHD 1.1 specs:
Length - 335mm
Beam - 130mm
Displacement - 950g.
Efficiency - I'd rather not say.

Catamaran specs:
Length - 500mm
Displacement - 915g

More on the catamaran design can be found in the PLOS journal article "Experimental and theoretical study of magnetohydrodynamic ship models".