The best replacement for inboard is outboard.

The best alternatives to inboard are rated as following:
★★★★★  outboard
★★★  sterndrive
★★★  outboard motor
★★  inboard outboard
★★  outboard motors
★★  outboard boat
★★  i o
★  outboard engine
★  outboard boats
★  outboard engines
★  outboard sailboat
★  outboard ski boat
★  outboard fuel economy
  i/o
  io
  i\/o
  outdrive
  inboard-outboard
  outboard better
  stern drive
  inboard\/outboard
  v drive
  outboard best
  outboard i o
  jackshaft
  jet drive

Your alternative for inboard is not listed? Suggest!
Speaking about inboard, one probably shouldn't forget about outboard.

Other search terms related to inboard and their ratings are:
★★★★★ outboard
You have in mind a companion for inboard and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of inboard in all years. Click on graph for more.
inboard
outboard
sterndrive