Hydrofoils-quadrofoils and retractable or foldable foils

Discussion in 'Boat Design' started by maj.klancnik, May 7, 2016.

  1. maj.klancnik
    Joined: May 2016
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    Location: Slovenia

    maj.klancnik begginer

    Hello. I'm trying to make a hydrofoil with retractable foils (using hydraulics). Can anyone confirm that the slovene quadrofoil has in fact retractable foils? Why hasn't anyone used this idea?/And if the idea simply wouldn't work, can anyone tell why?

    Thanks for your advice
    skatun likes this.
  2. kerosene
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    kerosene Senior Member

  3. rwatson
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    rwatson Senior Member

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  4. Skyak
    Joined: Jul 2012
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    Skyak Senior Member

    I only watched a few videos but it does not appear possible that the quadrafoil could possibly have 'retractable' foils -they appear detachable.

    Regarding why nobody makes a hydrafoil with hydraulically retractable foils, I would say it is difficult to justify the complexity of the gear. The hydraulics are a fix for a problem that manufacturers (or their salesmen) would prefer to simply overlook or downplay. I don't see any reason it can't be done, I see a mountain of reasons it might not be a commercial success. Hydrofoils have a limited performance advantage and adding the weight and complexity of the deployment just brings them to an apples to apples comparison that is not favorable. It is easier to sell a shiny sweet blabla fruit (attractive unknown) than it is to sell an overpriced ugly apple.

    One other note -the quadrafoil uses the efficiency advantage of foiling to overcome the cost disadvantage of battery energy storage. An electric boat with a conventional hull and the same speed and range would cost the same or more.
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