"Joe" wrote in message
...
On Oct 30, 1:20 pm, "Wilbur Hubbard"
wrote:
"Joe" wrote in message
...
I'm hoping someone might have a refference site for free wheeling prop
torque produced by a prop around the size of a 20X20 sailing at hull
speed. (9kts)
One goal on the boat we are designing and building will be an
electric drive system and we are leaning towards a power phase 150
drive.
http://www.uqm.com/propulsion_specs.php
It's a 200 HP perm magnet motor, so as you sail and the prop turns it
will generate power for the battery banks. These motors are now being
used in electric hummers in the Army. They need 420 volt DC using
two banks of batterys (35 batteries each bank) and will require 75 LBS
or torque to generate electricity.
Now I'm pretty sure the torque on a prop around the 22" size will be
way over 75 lbs but do not know exactly. Im hoping it's twice that at
least for gear reduction.
So I'm hoping someone might have, or know where I can get data on prop
torque. If not.... I guess I'm going to have to get a monkey wrench
and a scale and find a boat of the proper size to test.
Any suggestions?
Joe
So much for your original, dumb idea of commerce using sail only. Do you
know how "green" huge lead/acid battery banks are? You might as well just
run a diesel for your power and admit the folly of your original plan.
Wilbur Hubbard- Hide quoted text -
- Show quoted text -
:: Battery banks can and are recycled. My goal has stayed the same Neal.
::
That's not the point. There's the matter of disposing of the acid and
recycling the lead takes lots of heat and this heat comes from OIL. Battery
cases are made from OIL. Shipping the batteries to market takes OIL.
Displaying the batteries in a retail or wholesale outlet relies on
electricity and heat which takes, let me guess . . . OIL. So who do you
think you are fooling with your electric motor fantasy?
:: " The El Lago Coffee Company intends to show the world a model for
:: sustainability and profit using 100% renewable energy. We will provide
:: our customers with the greenest most delicious and eco-friendly
:: products on the market"
Tell me is isn't so, Joe! (thank you Sarah Palin) There is NO SUCH THING as
100% renewable energy. That's a myth. Even solar panels are not 100%
renewable running off the sun. What do you think it took to produce them in
the first place? Energy from, you got it. OIL!
:: Also a mission statement had been online as well
::
:: "Our mission is to deliver high quality, high demand, naturally grown
:: products shipped in a manner that fosters brand loyalty from our
:: customers, and promotes environmental preservation.
More pie-in-the-sky.
:: With coffee being the second largest commodity traded on earth after
:: oil, by reducing the oil used in transport coffee, we take an
:: important step in reducing our dependence on middle eastern oil."
The best way to reduce our dependence on middle eastern oil is to DRILL BABY
DRILL and do it in the USA territory.
:: GOT IT?
Nope! Conservation just won't cut it. Increasing the local supply of oil is
the only thing that will cut it.
:: Now that you know the basics let me clue you in.
::
:: 1.
:: We want to do a job, and will have many many days at sea with ZERO
:: wind.
:: Sitting still is OK if you have nothing better to do, and plenty of
:: spare cash.
That's what drove the last of the British windjammers from the seven seas.
Remember the Garthpool! She could not compete with the steamers.
:: 2.
:: Houston is a big port with a very busy, narrow, and long shipping
:: channel. I doubt the Pilot unions have a man that can tack a schooner
:: up the channel without a breeze.
So find a better port. Houston is just one of many. Find one you can
actually sail into. Port Everglades for example.
:: 3.
:: Fuel is getting expensive and oil needs to be used more wisely than
:: just burning it. We need to find ways of reducing demand to lower the
:: cost.
Yah, right. We conserve and reduce the cost and China and India buys all the
more and negates any savings. Real smart, mon!
:: 4. I hate dealing with diesel. After a bloody week, cut ,burned, and
:: then soaked in it, after a career of dealing with alge issues on just
:: about every boat older than 15 years old, and again the high cost, i'd
:: rather find a better way to have a nice long burst of energy at my
:: finger tips.
There isn't a better way or all commercial shipping would be using it
already. The only better way I can think of is the small nuclear reactors
they plan to market in Japan. These might be the ideal solution for
shipping.
http://www.nextenergynews.com/news1/...ar-12.17b.html
:: It's called "auxiliary power" Neal. This type of unit could also
:: generate the house power as well. The "primary power" and electric
:: generation comes from the sails.
Dream on. Do the math. It won't work.
:: On the issue of the bad side of acid and lead.. you have lead in your
:: keel and its leeching out around cedar bucket cut and chicken bone
:: reef as you type.
Can you say, "cast iron?"
:: I would think a blow hard like you could see harnessing electric
:: power from the sails a positive thing. Nice and quiet..ect..
Do the math. Not enough production capability spinning the prop and as the
prop spins the forward speed decreases. If you harnessed ALL the power of
the sails and turned it into electricity you might have enough to run your
electric motor but then you would *need* to run your motor because the sails
would not be making you go.
Wilbur Hubbard