This page should give some ideas:
http://www.human-powered-hydrofoils.com/hydrofoils/
It seems that a high performance model airplane motor driving the right prop and with minimal battery, electronics and flexible solar onboard could yield an impressive speeds for at least short ranges. Hydrofoil speeds exceeded 70mph even at the beginning of the 20th century: http://www.human-powered-hydrofoils.com/history/ . Human power hydrofoils are impressively fast with the world speed record set in 1991 by Mark Drela of MIT at 18.5knots over a 100 meter course.
http://www.foils.org/linksout.htm
Delft University team has already built a solar hydrofoil that simply kicks…
https://www.youtube.com/watch?v=Uigdqj94pZ8
Here's a link which notes 30knots on solar:
http://gizmodo.com/393139/worlds-first-solar-speedboat-does-30-knots-gas-free
Wonder how soon we'll see a solar-electric racer win the Wye-Island race?
-MT
From: electricboats@yahoogroups.com [mailto:electricboats@yahoogroups.com] On Behalf Of downintheblue
Sent: Sunday, February 28, 2016 1:56 AM
To: electricboats@yahoogroups.com
Subject: [Electric Boats] Foiling electric catamaran
Is it possible to make a foiling catamaran, 100% electric? Going 40 knots in sprints if required?
Only a generator as absolute last resort emergency, otherwise have the entire hull plastered in the most efficient solar panels, should be possible with 20-25 kW peak on a 50' cat.
And plenty of batteries.
I am just thinking, as soon as you are planing on the foils, the drag goes down. You can choose a shorter but faster run while planing, or keeping it slow for long range, even infinite, cruise.
I am thinking something like this one, but with electric engines:
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2 x 250 kW electric, 100 kWh battery, 25 kW peak solar panels?
Sure batteries are expensive, but the price is coming down. And consider all the items you DON'T need for cooling systems and other diesel expenses - put it into batteries and solar panels instead. 7000 liters fuel tank, that's about 5 tons when full of diesel. For that equivalent weight, you could have 500 kWh hours of Tesla style batteries. Even 10X more if using a better (but 4x as expensive) battery type. And the electric motors would also weight a lot LESS than equivalent diesels.
Thoughts?
Posted by: "Myles Twete" <matwete@comcast.net>
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