Hi Ron, Lawrence and All, While foils do work they can be
dangerous if they hit anything and lots of things floating in the water column
to hit like barrels, old docks, tree limbs, etc just under the surface, as is
running aground can pitch you head first off it. Getting on one from
the beach is hard as is launching them as require deeper water. They tend to
collect plastic, seaweed, etc killing performance.. A big navy 137' one hit a
whale off Miami at 50mph sending the crew to the hospital, the boat to the
scarp yard and I'm sure it didn't help the whale. Displacement is
the best way to low drag and the best way is having a 8 to 10-1 length to beam
ratio, a cat or trimaran is best. Note the fastest navy ships like aircraft
carriers are in this range. Or one can make a 24x3' or 32'x4' wide
voyaging 'canoe' . Why is fatter ones make large bow waves the boat
has to get through but the narrow ones cut through easily without making a bow
wave of any amount so it can go right through to higher speeds without planning
at lower power. Now if under 6mph works for you, monohull sailboats
make great E boats especially solar and especially if you want to live aboard
with solar able to give you A/C even. Note if doing an inboard E drive
with A/C or PM motors and regen one can anchor in a tide or river current or
while sailing and use that power to recharge the batteries for drive or living
power. Planning is possible but range is short as too much battery
weight hurts and at some point, stops planning. Even gas planning
powerboats are limited range to about 400miles even with large tanks.
Jerry Dycus
On Sunday, June 30, 2019, 01:33:01 PM UTC, Ron Porter via EV
<ev@lists.evdl.org> wrote:
For efficient hulls, look to high performance human-powered craft. For
example, some of the same people behind human powered flight had a project for
a human powered hydrofoil. I believe it was called the flying fish. I first
read of it in Scientific American.
From memory, it reached speeds of over 20 knots with a single person pedalling.
Even if that was an Olympic class athlete, that is no more than low single
digits for horsepower.
I've recently started looking into this again for one of my next boat builds,
not least because of my realisation that it could be a nearly perfect solution
to high performance, long range, long duration electric watercraft. And with
pedals in the mix, getting stranded without a charge is much less of an issue.
--
Ron
On June 29, 2019 9:18:49 p.m. CST, Lawrence Rhodes via EV <ev@lists.evdl.org>
wrote:
>I am not sure if your hull was designed to plane but if you force 10
>mph you are wasting energy. All your pontoons are good for is around
>7mph. I suspect you may double your range at lower speed. Lawrence
>Rhodes
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