View Single Post
Old 08-22-2016, 08:03 AM   #14
Orion
Senior Member
 
Orion's Avatar
 
Join Date: Feb 2003
Location: Cow Island
Posts: 914
Thanks: 602
Thanked 193 Times in 91 Posts
Default Physics

Quote:
Originally Posted by acg123 View Post
I was surprised to see people say yes. I have read in multiple factory manuals that you should never put the motor in gear when it's out of the water, even if it's connect to muffs. There is absolutely no resistance on the prop, so it's going to spin very fast, and when you take it in/out of gear, it can do damage to the prop hub, as well as other parts. If you really need to spin the prop, back it down a ramp, or lower the drive in a tub of water.
There is a mix of good/bad info here. There is no difference putting the motor in gear at idle in or out of the water. The prop shaft will actually spin the prop with less initial resistance than if the prop was in the water. The problem is if you go from forward to reverse without letting the prop stop spinning in neutral first. That could cause the prop hub to spin within the prop, damaging the prop.
Orion is offline   Reply With Quote