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    rudder
    by philmontague πŸ‡¬πŸ‡§ ( Leading Seaman)
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    22 Posts 21 Replies 10 Photos 58 Likes
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    RNinMunich
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    Country: πŸ‡©πŸ‡ͺ Germany
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    Excellent vid (and build!).
    Good find TDπŸ‘
    😎
    1
    Young at heart πŸ˜‰ Slightly older in other places.;-/ Cheers Doug
    ToraDog
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    Martin555,
    You are most welcome. I was glad to help. BTY, my own curiosity forced me to do it. I had always assumed( not a good thing to do as this case shows)
    that the three rudders worked together at the same time. I have been educated.
    Jonathan
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    Martin555
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    Hi ToraDog,
    Thank you for posting the video it made it a lot easer to understand the explanation of the effect and the rudder setup.

    Martin555
    If it looks right it probably is.
    ToraDog
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    I found a nice YouTube video of an Italeri r/c conversion. At about the 2:10 mark he shows the rudder arrangement. It is worth looking at.
    https://www.youtube.com/watch?v=W2VswNOwyWc
    https://www.youtube.com/watch?v=W2VswNOwyWc
    πŸ”—
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    RNinMunich
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    Hi ToraDog,
    I first heard of this effect when working on a LΓΌrssen T45 FAC, which had basically the same hull as the S Boot. But the principle is explained in the link you postedπŸ˜‰-
    "These rudders force the water under the hull outward, lifting the stern, thus reducing drag, and lowering the wake height, which β€œrequires less energy, allowing the vessel to go faster."

    "The effect was noticed at speeds above 25 knots, by swinging the "effect" rudders outboard by 30Β°. Once attained, the effect rudders could be swung back to 17Β° outboard, and the speed could be reduced to as little as 20kn while still maintaining the benefits of the effect."

    "During test runs with S-2, the first boat from series production, it was accidentally discovered that the boat stopped responding to the rudder at high speed and full rudder positions but started to display the effects described above. When investigating what caused this behaviour, the basic principles of the LΓΌrssen effect were discovered. Starting with S-2, the following boats were then equipped with the two small rudders on either side of the main rudder which could be angled outboard up to 30Β°.
    A wedge was added under the rear of the hull from S-18. The wedge further added to the effect of helping the craft to stay level at high speed."

    Alles klar Herr KapitΓ€n?
    Cheers, Doug 😎
    2
    Young at heart πŸ˜‰ Slightly older in other places.;-/ Cheers Doug
    ToraDog
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    Doug,
    That is interesting. When were the outboard "rudders" used and what activated the movement? It sounds like they were moved at specific times and to specific points, rather than proportionally. If so then a computer radio should work well to activate them using a mixer function, which could be set up to just about any parameter. I would do it,, but I gave away my E-boat hull. LOL
    2
    RNinMunich
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    I too had been pondering the application in a model TDπŸ‘
    It means actually having two control channels!
    The outboard rudders are not used for steering and in fact should NOT be linked to the main rudder, only to each other! But not directly as they work in opposite directions.
    Maybe they should be referred to as 'vanes' rather than rudders?
    A second servo and control channel would be needed to swing them out by 30 or 17Β°.
    I wonder if the LΓΌrssen Effect would be measurable on a model!
    Whose up to try it?πŸ˜‰
    Cheers, Doug 😎
    2
    Young at heart πŸ˜‰ Slightly older in other places.;-/ Cheers Doug
    ToraDog
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    The e-boats used the Lurssen effect very well. I would be interesting to try it on your built. It is explained here: https://en.wikipedia.org/wiki/L%C3%BCrssen_effect
    https://en.wikipedia.org/wiki/L%C3%BCrssen_effect
    πŸ”—
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    philmontague
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    thanks prob will
    1
    phill montague
    Martin555
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    Just happy to help Phil.
    I also agree with Doug a Schnellboot build log would be good.

    Martin555.
    2
    If it looks right it probably is.
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