Reading through the rookie mistakes thread, and I see quite a few people have listed "leaving the TM down while underway", or something to that effect. I tried searching for a while as to just what happens if you forgot to pull up the motor, but only found hits on leaving transom mounted kickers down.
So what exactly is the end result of this flub? I'm assuming nothing good , but is it just additional drag, or more like "plan on buying a new TM when you get home" kind of thing?