PropSim

Discussion in 'Software' started by SolomonGrundy, Sep 8, 2006.

  1. SolomonGrundy
    Joined: Feb 2005
    Posts: 183
    Likes: 9, Points: 18, Legacy Rep: 51
    Location: lost

    SolomonGrundy I'm not crazy...

    Hi all, I'm attempting to develop a 2 bladed prop for my HPV. I have PropSim but I don't know what all the input parameters mean...what does " # of lines" and " Hub/Diameter Ratio" mean?
    I sure could use some help from someone who has used the program before...I'm just a lowley welder.
     
  2. SolomonGrundy
    Joined: Feb 2005
    Posts: 183
    Likes: 9, Points: 18, Legacy Rep: 51
    Location: lost

    SolomonGrundy I'm not crazy...

    Wow, over one hundred views and zero replies...
    Has anyone even heard of PropSim?
     
  3. RANCHI OTTO
    Joined: Apr 2005
    Posts: 1,042
    Likes: 37, Points: 0, Legacy Rep: 535
    Location: TRIESTE (ITALY)

    RANCHI OTTO Naval Architect

    Hub/diameter ratio is the hub diameter of the propeller taken at his mean length divided to the propeller diameter.

    What is PropSim?
     
  4. SolomonGrundy
    Joined: Feb 2005
    Posts: 183
    Likes: 9, Points: 18, Legacy Rep: 51
    Location: lost

    SolomonGrundy I'm not crazy...


    It is a computer program for determining propshape with a given set of parameters.
     
  5. RANCHI OTTO
    Joined: Apr 2005
    Posts: 1,042
    Likes: 37, Points: 0, Legacy Rep: 535
    Location: TRIESTE (ITALY)

    RANCHI OTTO Naval Architect

    All kind of propellers? I mean semisubmerged, supercavitating, transcavitating, conventiional, etc.....
     
  6. SolomonGrundy
    Joined: Feb 2005
    Posts: 183
    Likes: 9, Points: 18, Legacy Rep: 51
    Location: lost

    SolomonGrundy I'm not crazy...

    Only conventional props as far as I know.
     
  7. jehardiman
    Joined: Aug 2004
    Posts: 2,870
    Likes: 418, Points: 83, Legacy Rep: 2040
    Location: Port Orchard, Washington, USA

    jehardiman Senior Member

    Did you go here and read this?

    http://www.umwelteinsatz.ch/IBS/propsim.pdf

    "# of lines" is how many output lines the program gives.

    Looks like a pretty basic program based upon Pooles work, which is a good place to start. However using ideal disk theory will not produce the absolute most efficient prop, as it ignores tip and root effects.
     
  8. SolomonGrundy
    Joined: Feb 2005
    Posts: 183
    Likes: 9, Points: 18, Legacy Rep: 51
    Location: lost

    SolomonGrundy I'm not crazy...

    I wonder how much of an impact the root & tip effects will have on the prop considering the ultra low rpm & horsepower...
     
  9. jehardiman
    Joined: Aug 2004
    Posts: 2,870
    Likes: 418, Points: 83, Legacy Rep: 2040
    Location: Port Orchard, Washington, USA

    jehardiman Senior Member

    They can reduce efficency 5-15%, more if you have more than two blades.
     

  10. SolomonGrundy
    Joined: Feb 2005
    Posts: 183
    Likes: 9, Points: 18, Legacy Rep: 51
    Location: lost

    SolomonGrundy I'm not crazy...

    efficiency

    SWEET!
    That leaves 35-45 % loss in efficiency due to the rest of the system (cutlass bearing, bevel gear, sprocket hub and chain) to be within our nominal parameters...unless there's something I'm missing.
     
Forum posts represent the experience, opinion, and view of individual users. Boat Design Net does not necessarily endorse nor share the view of each individual post.
When making potentially dangerous or financial decisions, always employ and consult appropriate professionals. Your circumstances or experience may be different.