Turning in or turning out....

Discussion in 'Powerboats' started by Verytricky, Aug 21, 2008.

  1. Verytricky
    Joined: Oct 2005
    Posts: 248
    Likes: 17, Points: 0, Legacy Rep: 400
    Location: London

    Verytricky Large Member

    Setup of a boat with two 300 promax outboards.

    Existing setup:

    LH gearbox on port, RH gearbox on Stbd. Is this called turning 'out'?



    Required setup: The boat is quite unstable at high speeds. when it 'wobbles' - similar but not the same as chine walk ( a very slow chine walk - 2 seconds from side to side )- the prop opposite to the side digging in lifts out the water. Currently ( I think ) the now single prop in the water tries to push the boat further over due to the torque of the prop in the water.

    Say: Starbd side diggs in, Port side lifts, port engine not in the water, starbd prop running right tries to push the boat further over to starbd due to torque.


    Possible fix:
    Swap gearboxes, then when boat gets a wobble on, the starbd side prop running left now tries to push the boat back straight with the torque, result a better balanced boat.


    Thoughts?
     
    Verytricky, Aug 21, 2008
    #1
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.