Home |
Search |
Today's Posts |
#3
posted to rec.boats.cruising
|
|||
|
|||
Prop torque question
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. " 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" 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. 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." GOT 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. 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. 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. 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. 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. 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. I would think a blow hard like you could see harnessing electric power from the sails a positive thing. Nice and quiet..ect.. Joe |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
What's Difference Between Inch-Pound Torque and Feet-Pound Torque? | General | |||
480x8 wheel/torque question | General | |||
*FS* Land and Sea Variable Pitch Torque shift Prop | General | |||
*FS* Land and Sea Variable Pitch Torque shift Prop | General | |||
Power2 Torque-shift prop information needed TIA | General |