Sailboats are designed to be propelled by wind power, but sometimes an outboard motor is handy to have onboard. While it's possible to mount an outboard on a sailboat, it's not recommended unless the boat is specifically designed for it. Here's why:
1) Sailboats are not balanced for outboards. Most have their weight concentrated in the middle or back of the hull, which makes them unstable when an outboard is mounted on the transom (the back end of the hull). This can make the boat difficult to control, especially in windy conditions.
2) Outboards create drag when they're not being used. When you're sailing, every bit of drag counts, and an outboard hanging off the back of your boat will slow you down.
3) Outboards add complexity (and potential problems) to your boat. If something goes wrong with your outboard, you now have two engines to troubleshoot and repair instead of just one.
4) You'll need a way to secure your outboard when it's not in use. On a small sailboat, this can be tricky - and if you don't do it right, your outboard could end up overboard!
All that said, there are some circumstances where mounting an outboard on a sailboat makes sense. For example:
1) If you frequently sail in areas with little or no wind (like lakes), an outboard can give you a backup form of propulsion.
2) If you want to use your sailboat for fishing or exploring shorelines, an outboard can help get you there without tacking back and forth all day long.
3) Some sailors like having an auxiliary engine for docking maneuvers or emergency situations (like if you run aground).
Ultimately, whether or not you mount an outboard on your sailboat is up to you - but weigh the pros and cons carefully before making a decision!