1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Using a propeller to excavate sand under a boat

  1. Apr 3, 2017 #1
    Good day. I want to use the boat's propeller to excavate sand. This will be done using a tube which will deflect the thrust downward. What are the implications? The boat is anchored. Thus there is zero forward speed. I suspect this may change the properties of the way the propeller functions.
    All advice is greatly appreciated
  2. jcsd
  3. Apr 3, 2017 #2


    Staff: Mentor

    Yes you can do that. Some dredges do similar things, such as in this picture. But dredges normally use a separate propeller, not the ship's propulsion propeller.


    1. Don't get overly ambitious. Moving lots of sand takes lots of power. But if you are just trying to remove 1-2 feet of silt directly under your boat, using a hose powered by your prop, and you in scuba gear to direct the hose, it can work.
    2. Consider how far away you move the sand. Too close and it will silt in again in a short time.
  4. Apr 3, 2017 #3
    I think the treasure hunters already do this.
  5. Apr 3, 2017 #4


    User Avatar

    Just keep in mind the location of your engine's cooling water intake and make sure you will not be ingesting any of the resulting sand/water mix into your cooling system.
  6. Apr 4, 2017 #5


    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    I wonder how fast the prop blades are eroded? Perhaps there is a way to avoid sand going through the prop.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted