Hi Fat Controller ,
Most of my larger tugs 48" and bigger are powered by 600 can motors . Only one has a gear box , and I don’t believe they are worth the money . My direct drives work just great using 4 blade 60mm props .
Plus I’ve never buy my motors from hobby shops . All summer I go to lawn sales , rummage sales etc. and buy unwanted cheap R/C monster trucks great source for motors all sizes at the fraction of the cost plus the tires that can be used as bumpers on tugs , just buff off some tread make them look real.
Also pick up cars and some toy trucks . Great source for lights and sound systems
Besides saving money , you recycle .