1 lefthand pitch and one righthand pitch prop for a 40 inch boat require 2 x 3" inch or 3 1/2" inch props 2 motors fed from the same battery ? just change wiring to get left hand rotation motors don't need anything fancy couple of 12v battery drill motors , old gmc drills make good use of what you can scrounge my next tug is the ocean tundra 48" contra rotating in korts nozzle if you have some time spare , facebook ( Bridgetown model boat group ) there you will see images of my tug I built 45 year ago its only a single prop 4" inch , I built that prop 45 year ago ,,, also there are 2 new built props left hand and right hand 5 blade destin for the ocean tundra ( the motor in the flying duck , is a cut down vw windscreen wiper motor the frame around the armature is brass fabricated ,,, 50 year ago I canablise anything , there was nothing around
chas