The Eddie Is Low Carbon
Bret Cahill
> the Pacific with AGW:
> http://www.youtube.com/watch?v=fXIAtHZh2ro
Jet ski assist isn't allowed in The Eddie but there may be an
alternative. Carbon fiber tanks from the old H2 fuel cell cars would
make good stringers for a gun.
Pump the board up to 50 bar and use the pressure to run a die grinder
pump.
Sooner or later they'ld figure it out especially if the board blew up
on a reef but you might get $50K first.
Bret Cahill
turby
Laws of physics apply...
A tiny propeller trying to move a 150lb person on a board won't
generate much speed. Or for very long.
Bret Cahill
Three X 50' long assists at 10 knots would be realistic.
Being a little further outside greatly expands your opportunities.
Bret Cahill
turby
> > > > Hurricane activity drops is the Atlantic but wave action increases in
> > > > the Pacific with AGW:
> > > >http://www.youtube.com/watch?v=fXIAtHZh2ro
> > > Jet ski assist isn't allowed in The Eddie but there may be an
> > > alternative. Carbon fiber tanks from the old H2 fuel cell cars would
> > > make good stringers for a gun.
> > > Pump the board up to 50 bar and use the pressure to run a die grinder
> > > pump.
> > > Sooner or later they'ld figure it out especially if the board blew up
> > > on a reef but you might get $50K first.
> > > Bret Cahill
>
> > Laws of physics apply...
> > A tiny propeller trying to move a 150lb person on a board won't
> > generate much speed. Or for very long.
>
> Three X 50' long assists at 10 knots would be realistic.
No, it isn't. A die grinder pushes maybe a pound or 2 in normal use.
The load would increase tremendously with a body on a board, and you
wouldn't get anywhere near 10 knots with a prop on a die grinder. If
you got 2 knots, I'd be very surprised.
Bret Cahill
Pneumatic tools have a high power density, several hp/lb. A two pound
die grinder powering a jet pump could move more water faster than
Michael Phelps.
The biggest inefficiency will be in propulsion at low speeds just like
a jet ski or, for that matter, any craft relying on propulsion. At
low speed all propulsion does is stir up water. That's why so many
birds like roadrunners who prefer to run until the coyote is just
inches away.
The advantage over a jet ski is you can paddle at first to get moving
-- think of paddling as first gear -- and then release the air when
the efficiency is higher.
Then you are in overdrive.
Bret Cahill
Bret Cahill
Bret Cahill
Eliminate most of the moving parts by using the air to eject water
directly from a coiled up 1" dia X 80' long tube. The long tube is
filled with seawater just before takeoff. After getting up to speed
paddling the compressed air is released.
Vol of one 4" dia 6' compressed air tube = 0.5 cu feet. Adiabatic
expansion from 50 atm to 1 atm => 90,000 ft llbf energy/tube.
If it were possible to have 100% conversion to kinetic energy then a
200 pound craft would be going 173 ft/sec or 118 mph!
It would be more realistic to think of it as a 30 hp jet ski on for 5
seconds.
Bret Cahill