At 08:40 AM 3/02/2010, you wrote:
>Has or does anyone know of a 16 foot Jet Boat to electric conversion?
>There is no transmission or reverse needed so it would be direct.
>I'm looking for a 4000--6000 rpm motor, simple set up. Any info
>very appreciated.
>
>Thanks, Ernie
>vacationdoc@
G'day Ernie
The Australian Maritime College - Vessel Propulsion Lab vessel
"greenliner" is a jet boat, but a low speed one, not really
efficient. We have had it up to 11 knots at 96 volts - it normally
runs 48V and no more than 6.5knots. With 120V and a lighter battery
it should plane at about 16 knots - that is what it did before with
the internal combustion engine. Run time will become an issue then,
as it'll be running probably about 20kW, so at 120V about 160 amps,
so a 200Ah lithium battery would be about 200kg (down from 250kg now)
and give just over an hour, and that is in a skinny, low-drag hull -
7 meters, so longer than your 16 foot.
The motor is simple enough, pick your lump of DC motor from ADC,
warfield (warp), High torque electric or others, (google 'em will
find 'em), also through a number of EV parts suppliers. Depending on
your setup you could use a 2 or 3- step 'rectactor' controller, 24V,
48V, 96V, consisting of four or five contactors and some honkin'
great diodes, no electronics to throw a 'hissy' when it gets damp. 3
electric speeds plus the variability of the bucket should be enough.
Add four 24 volt chargers and good to go.
Only trouble is, your really going to need to look at Lithium
batteries to keep the weight under control, so as to have more than a
few minutes of fun (run) time, so battery management system, all that
other guff that goes with it.
How deep are your pockets? If you can throw a good chunk of dollars
(or whatever currency is legal tender in your country) at it, then
easy, have fun. If you are 'on the cheap', then maybe a jet boat is
not so practical. What do you want to use the boat for? If a short
run across a fast river, then it may be OK with lead batteries -
although a bit embarassing when you try and sneak an extra trip and
get caught out halfway.
Regards
[Technik] James
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