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
<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
<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

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

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