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Alum Poles
In 1956 an article appeared in an American magazine that predicted that there would be an energy crisis about 15 years from that time. They were not far out, the first energy crisis made its appearance in 1973. They forecast the eventual downfall of the internal combustion engine and considered alternatives for its replacement. The electric motor, they said, would not qualify, as it was too heavy. In those days, the conventional DC traction motor was all that was available. In that respect they were right, the DC motor was too heavy to give the kind of performance required to satisfy drivers used to gasoline powered cars. The three-phase induction motor had a superior power-to-mass ratio but was essentially a constant speed device, and so was not considered suitable.
The decade of the 60's brought power semiconductor devices which made the solid state Variable Speed Drive (VSD) possible. The speed of a three-phase induction motor could then be varied by varying the frequency and the voltage.
In the United States the usual supply frequency is 60Hz, while in the rest of the world the frequency is 50Hz. A 60Hz two-pole motor rotates at about 3420 r/m on optimum load. The corresponding speed for a four-pole motor is 1710 r/m.
For a 50Hz motor the corresponding speeds are 2850 r/m and 1425 r/m. The power-to-mass ratios of such motors are similar to those of a high speed diesel engine.
To obtain better power-to-mass ratios one can go to higher frequencies. The speed of rotation of a motor with a given number of poles is proportional to the frequency. High frequency motors rotate at high speeds and therefore have improved power-to-mass ratios. The electrical equipment in aircraft is required to have triple redundancy. This means that three motors must be provided for the same particular task, any one of which must be capable of taking over the duties of the other two. With such a stringent requirement, mass and volume become very critical. Thus the motors and alternators used on aircraft usually operate on a frequency of 400Hz but some use 1200Hz. Space and mass requirements are also important considerations on ships. Ships normally have electrical systems operating on 400Hz.
The following information will give an idea of the advantages of using high frequency motors:
A 60Hz motor with two pole pairs rotates at 2840r/m and has a power-to-mass ratio of 250W/kg. A 400Hz motor with two pole pairs rotates at 22 720r/m and has a power-to-mass ratio of 2000W/kg. For four pole motors, the corresponding figures are, 1704r/m and 125W/kg for 60Hz, and 11 360r/m and 1000W/kg for 400Hz.
High frequency motors have small size and mass. For a given power their torque is much smaller than that of a low frequency motor. They make up for it by rotating at proportionately high speeds. Since the torque is small, the motor can be made smaller and lighter. The parameters in the foregoing table refer to motors with an aluminum frame and aluminum squirrel cage.
We see that it is possible for electric motors to compare favorably with internal combustion engines in power-to-mass ratio. Further, they are more compact and easier to package and do not require all the auxiliary equipment of an internal combustion engine, such as radiator, exhaust system, starter motor, alternator, transmission, etc.
The Lord Jesus Christ appeared to the author, John Talbot, in a vision, on September 30th 1974 and called him to follow Him. He is the author of several books on the subject. He is now the CEO of Talbot Electric (Pty) Limited, a research and development company incorporated in the Republic of South Africa. For more information visit http://www.johntal.com/home.htm
fishing today?
okay so today...well not right now since its 2:39am but anyway later on today me my dad and my sister are gonna go fishing at alum creek while my mom is at work and there is alot of catfish big too and i was wondering what is the best way to catch them? i know chiken liver is what they love but i mean what kinda of fishing pole do i need?(were buying new supplies tomorrow)and best ways to get them near us....ect and my dog loves to go wiht us(kerry blue terrier) and i was wondering will it be okay for her to go swimming? were not gonna be excatlly at alum creek but were goin somewhere near ther kinda like a big pond/lake so will it be okay for her? also what kinda of fish accesiors should i get? i mean were throwing away all are stuff and getting more.....sorry about the spelling but i am so tired! oh yea and i am a girl!
Ugly Stick
Ugly Stick rods are known for their durability and sensitivity, two things you really need to catch catfish. They have all sorts of special features, like blank-through-handle construction (a graphite core surrounded by a layer of glass), which make it easier for you to feel when a catfish hits your line. They also have certain models designed specifically for the mighty, fighting catfish. This is kind of a standard rod for catfish anglers, and you won't hear too many bad reviews about them. The Ugly Stick Shakespeare Tiger has been one of the most popular models since it was introduced in the '70's.
Mitchell Catfish Spinner Rod
This is another rod made just for catching cats, with a tough fiberglass rod guaranteed not to snap in half when a giant catfish is fighting on the end of it. This model uses EVA handles, which are both comfortable and durable.
Crawdads,shrimp,cut bait,clams,worms,liver or dead minnows are all god bait for cat fishing
Aluminum Vs. N n S poles
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 Alum-A-Pole Mud Sills  US $12.00
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 1 EACH 6' ALUM FLAG POLE KIT # ARP-1 NEW US $14.90
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 Complete 16' foot Alum FLAG POLE KIT w Flag - 16 gauge US $49.99
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 FERRAZ SHAWMUT 67111 POWER DISTRIBUTION BLOCK 600V CU9AL 1 POLE ALUM US $54.99
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 Paha Que Tepee Alum Poles Portable Outhouse US $185.99
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 FRUIT HARVESTER PICKING BASKET 12' TELESCOPE ALUM POLE US $66.25
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 Alum-A-Pole brake Legs US $139.00
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 2---Alum-A-Pole end rails 24 in US $290.00
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 Alum-A-Pole Pump Jack US $75.00
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 HUBBELL HBLPP10A ALUM. POWER BAR POLE US $150.00
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 Alum-A-Pole Pump Jack Scaffolding by Lynn Ladder US $1,995.00
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 Alum-A-Pole Pump Jack Scaffolding Folding Brace AABF US $48.52
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 Taylor Made Products, 48In Alum Flag Pole, 919 US $34.36
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 Taylor Made Products, 30In Alum Flag Pole, 917 US $29.72
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 Taylor Made Products, 36In Alum Flag Pole, 918 US $31.50
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 TREK 4 SEASON 8 x 8 BACKPACK DOME- ALUM. POLES 2 DR US $137.95
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 1 EACH 2-4' ALUM EXTENSION POLE # 89005 NEW US $14.60
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 Alum. Military Barrier Bird Netting 12 Pole Outfit w/ends and bag US $65.00
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 Gourd System 13.5 ft. Alum. PM Gourd Pole Kit US $98.99
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 13.5 ft. Alum. PM Gourd Pole Kit 8 Piece Double Spiral US $98.99
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 Aluminum siding Brake Alum-A-Pole free legs US $1,495.00
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 Werner 3 Pole Alum Pump Jack Scaffold System - 24' High US $1,968.08
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 Alum-A-Pole Pump Jack US $125.00
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 Alps Mountaineering Vertex 4 Alum Poles Sage/Rust Tent US $217.10
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 Alps Mountaineering Zephyr 3 Alum Poles, Sage/Rust Tent US $163.15
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 Alps Mountaineering Vertex 2 Alum Poles Sage/Rust Tent US $164.47
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 Alps Mountaineering Zephyr 2 Alum Poles, Sage/Rust Tent US $142.10
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 Alps Mountaineering Zephyr 1 Alum Poles, Sage/Rust Tent US $126.32
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 Chinook 6 Person Tent, Tradewinds Guide w/ Alum Poles US $639.88
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 Chinook 6 Person Tent, Tradewinds Lodge w/ Alum Poles US $580.60
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 Chinook 6 Person Tent, Twin Peaks Guide w/ Alum Poles US $573.92
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 Chinook 6 Person Tent, Cyclone Base Camp w/ Alum Poles US $538.60
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 Chinook 4 Person Tent, Twin Peaks Guide w/ Alum Poles US $517.48
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 Chinook 5 Person Tent, Whirlwind Guide with Alum Poles US $496.74
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 Complete 16' foot Alum FLAG POLE KIT w Flag - 16 gauge US $67.99
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 Complete 20' foot DELUXE Alum FLAG POLE KIT w. 2 Flags US $90.99
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 Gold Medal 2144HFB - Barrel Style Awning, SS Poles, Alum Frame, Mounting US $890.69
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 Expedition 7075 Alum Alloy Trek Pole for Wading, Hiking US $57.07
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Another great place to shop for Alum Poles products is Amazon. They have more than just books!
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Mitaki-Japan Blk Alum Walk Stick W/ Led Fl
$28.95 Features 9-bulb LED flashlight. Includes 4 LR44 batteries. Measures 1-1/4” x 6-1/2” and extends to 41-1/2” long.... |
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Iv Pole, Stainless Steel 4Hk5Large Alum
$799.95 Stainless Steel I.V. Stand Supports All Makes of Infusion Pumps. Available with 4 hook "Secure Grip" hooks. The design supports all makes of infusion pumps with multi-pump capability. The base post has 1" O.D. stainless steel tubing and the extension post has 3/4" O.D. stainless steel tubing. 5 leg stands are equipped with 2" single wheel hard rubber casters. The height is adjustable from 64" to 1... |
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Qk Connect Hygen Ext Pole 6 Ft - 18 Ft Alum Yel 3
$74.24 User-friendly grip makes handle more comfortable to use. Telescoping handle adjusts height, locks in place. Yellow.... |
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Draper - Projection screen operating pole ALUM OPERATING POLE 6FT ALL MODELS EXCEPT APEX Manufacturer Part Number 227010
ALUM OPERATING POLE 6FT ALL MODELS EXCEPT APEX Drapers dedication to innovation made it a leading supplier of projection screens and related products. Draper always follows its business philosophy - to make a quality product and offer it at a reasonable price.... |
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RUGGED CAST ALUM PWR BOX PB24 PLUS BATT B/URUGGED CAST ALUMINUM POWER BOX PB24 PLUS BATTERY BACKUP POLE . RUGGED CAST ALUMINUM POWER BOX PB24 PLUS BATTERY BACKUP POLE NV-CAM. untmenudiv class=ip_divclass onmousedown=dragStart(event)>
RUGGED CAST ALUM PWR BOX PB24 PLUS BATT B/URUGGED CAST ALUMINUM POWER BOX PB24 PLUS BATTERY BACKUP POLE . RUGGED CAST ALUMINUM POWER BOX PB24 PLUS BATTERY BACKUP POLE NV-CAM. untmenudiv class=ip_divclass onmousedown=dragStart(event)>... |
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DEWALT DW0734 Aluminum 13-Foot Telescoping Grade Rod in Feet, Inches, and Eighths
$37.99 Lightweight and dependable, the DeWalt DW0734 13-Foot Telescoping Grade Rod is a versatile tool that lends accuracy to a wide range of surveying and planning tasks. Crafted from strong yet light aluminum and featuring a four-section telescoping design that makes handling and storage easy, this rod offers markings in inches, feet, and eighths for precise readings. And at a full 13-feet length, it's... |
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Leviton 2651-2I 15 Amp, 120 Volt, Toggle Co/Alr Single-Pole AC Quiet Switch, Residential Grade, Grounding, Ivory
$1.99 Grounded single pole quiet switch for direct connection to aluminum or copper wire. Silver alloy contacts, break off plaster ears. Terminal screws accept up to... |
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Werner 300-Pound Duty Rating Fiberglass Flat D-Rung Extension Ladder
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Park & Sun Badminton Pro Set
$88.69 Establish your own backyard badminton court with this professional-level badminton set from Park & Sun Sports. The set includes a pair of square, telescopic, 1 1/2-inch-wide PVC poles featuring a three-piece design. A 21-foot-long badminton net is official sized and sports a 1-inch top tape and 4-inch side sleeves. Four aluminum badminton rackets are equipped with a steel shaft, Gosen strings, and... |
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Aluminum Ex Pole Mt Adptr White Finish (requires UNI-WMB1)
$44.06 Physical Security, Sony, Vandal Resistant 7 Tinted Dome Pendant, UNIPMA1... |