Manoeuvring trials full speed astern

Discussion in 'Boat Design' started by Vinassman, Mar 23, 2015.

  1. Vinassman
    Joined: Mar 2011
    Posts: 43
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: Batam, Indonesia

    Vinassman Junior Member

    Dear all,

    I would like to test the manoeuvring characteristics of a boat fitted with 3 shaftlines while sailing astern. She has one rudder in way of each side shaftline.

    I am thinking of doing 2 turning circles, full speed astern (one portside, one starboard side) with 1, 2 and then 3 shaftlines.

    What do you think? Is there any other test that is interesting to perform astern?

    Thanks in advance.

    VM
     
  2. TANSL
    Joined: Sep 2011
    Posts: 6,807
    Likes: 499, Points: 93, Legacy Rep: 300
    Location: Spain

    TANSL Senior Member

    I'm not sure what you want to check with that test. Could you explain, please?
    There is a test that all regulations contemplate that is called "crash stop" : full speed ahead, full speed astern to check the time and distance that the boat runs until completely stopped.
     
  3. Vinassman
    Joined: Mar 2011
    Posts: 43
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: Batam, Indonesia

    Vinassman Junior Member

    Hi TANSL,

    Sorry I wasn't very clear. We will do the usual manoeuvring tests such as the crash-stop and turning circles with the 3 shaftlines.

    However, since she's the first of the series, I will be interested to spend additional time to get a better idea of how she manoeuvers and especially when going astern.

    However, I can't find any specific test to be conducted while sailing astern hence my question.

    Thanks
     
  4. BMcF
    Joined: Mar 2007
    Posts: 1,061
    Likes: 79, Points: 48, Legacy Rep: 361
    Location: Maryland

    BMcF Senior Member

    The trials program for a 63-meter naval combatant we recently completed included a "full speed astern" test. The test did not involve any of "our" equipment so I didn't pay it a lot of attention, but best I recall it was very simply a demonstration of the ability to maintain/steer a specified course, at full reverse power, for 30 minutes continuously.
     
  5. gonzo
    Joined: Aug 2002
    Posts: 15,498
    Likes: 1,039, Points: 123, Legacy Rep: 2031
    Location: Milwaukee, WI

    gonzo Senior Member

    Testing how she reverses with cross-winds will give you valuable data too. It is a very common maneuver for docking.
     

  6. TANSL
    Joined: Sep 2011
    Posts: 6,807
    Likes: 499, Points: 93, Legacy Rep: 300
    Location: Spain

    TANSL Senior Member

    All tests should be performed following a specific protocol so that input data and outputs can be properly evaluated and compared with standard values. The test you propose, Gonzo, can be interesting. What is the protocol for this test?
     
Loading...
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.