If our airplane had a gross weight of 3000 pounds the main hydrofoils
    would
     have to have ten times the area of these hydro foils
     to get the same height at 35 MPH.

     Lets say they are now 8" by 4" or 32 square inches.
     320 square inches divided by a span of 24 inches
     would give a cord of 13.5 inches. Quite doable.

     When landing the hydro foil  impact should be less as the foil will
     initially tend to sink while still lifting  and mitigate the impact to
    the hull.

     The so called Kite's are really wings with high pressure inflated
    spars and ribs.
     They are quite capable of tacking up wind.

     Here is a video. I'll try to get a better one in a few days.

     Paul Lamar

    Thanks, Paul.

I knew that there had been military research into foil
    landing gear back in the '60s so googled to see if anything recent. Came
    up with this: https://www.toysforbigboys.com/water-toys/lisa-akoya/This

     was the only
    site I could find with footage of Lisa Akoya water operations.The cat
    configuration has a president in the S.55:
    https://en.m.wikipedia.org/wiki/Savoia-Marchetti_S.55
     Beautiful craft.

    I'm sure you're aware of all this. Just trying to prolong the discussion
    of your very interesting design. :)

Thanks, again. Boyd Thompson

    Yes I knew about the Savoia-Marchetti_S.55
    A whole squadron of them flew to the US in the 1930's from Italy

    The other Italian flying boat I was thinking off was the Piaggio PI36.
    A gull wing with two engines.

    Paul Lamar

    https://www.youtube.com/watch?v=zQ2sSRBMPqs

    The US Navy did this years ago- this is what happens when Boeing builds
    a boat!

    Kevin Alderman
    A&P, GROL, ASEL, AMEL
    CFI,Comm/Inst
    100 ton Master
    CDL Driver

    The Navy talks about all the controls required to control hydra foils and
    kite borders do it all with foot work and weight shift.

    It was over cast that day and this was well off shore  but you can see how
    easily  a hydro foil can handle rough water.

    Rough water is the nemesis of sea planes.

    Paul Lamar

That's pretty amazing. Never seen the foil ski in rough water.

Thank you.

Boyd Thompson

Here are a couple of scans of sea planes in rough water.
Dornier totally understood that high mounted engines needed a long
fuselage to counter the tendency of the aircraft to dive on landing.

This was based on the Dornier Wal which by far was the best selling
sea plane in the 20's and 30's.


Paul Lamar

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