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Performance Aluminum Inline
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Roller blades, roller skates or inline skates all refer to a skate. History of roller blade is somewhat long and winding. While people often use the term roller blade for the boot with wheels underneath, it may help to know that roller blade is actually a trade name and not the boot with wheel that you usually enjoy. Rollerblade, Inc. is the manufacturer of many modern roller skates.
Historical timelines of roller blades
1700s
The history of roller blades or roller skates, started in the early 1700s when a London stage performer used roller skates in a performance. This is the first sighting of a roller blade. The concept came from Holland where Dutchmen would nail wooden spools to strips of wood and attaching them to their shoes. They will use their skeelers to slide through frozen canals.
1760
Joseph Merlin, a London instrument maker and inventor wants to impress some people to promote his museum. He attended a masquerade party using metal-wheeled boots. However, to make his entrance engaging, he played his violin as he rolls his skates. Unfortunately, he crashed into a solid mirror wall.
1818
In this year, the premier German Ballet group known as Der maler oder dei Wintervergn or The Artist or Winter Pleasures used roller skates in one of their production numbers. The intention was actually to perform ice skating, however since during this time it is yet impossible to produce ice on a stage, rollers skates are a better alternative.
1819
Monsieur Petibledin received the first patent for a roller skate in France. His roller skates are made of wood sole that is attached at the bottom of a boot. There are two to four rollers made of either copper, wood or ivory forming a straight line under the wood sole.
1823
Another patent was issued for Rolito. Rolito is a shoe or boot with five lined wheels at the bottom. This is the first design that resembles our roller skates of today, however, Rolito cannot follow curved path as the skates of today can.
1863
The birth of quad skates entered the history of roller blades or roller skates. An American inventory names James Plimpton designed a usable pair of skates. His skates had two parallel sets of wheels: one pair under the heel and the other pair under the toes. Plimptons design was the first useable pair of skates; it is able to navigate curves unlike earlier models.
1902
Seven thousand people attended the opening of a skating rink in a Chicago Coliseum. This started series of skating rinks opening in the United States.
1970s-1980s
The disco era gave skating another boost in popularity where many Hollywood movies included roller skating in their theme. Over 4,000 roller discos are also seen operating in and around the United States.
1979
This marks the birth of the name roller blades. Hockey players and brothers Scott and Brennan Olson redesigned an old skates as a tool to practice hockey. They used modern materials in improving the design. They also establish Rollerblade, Inc.. The modern design of roller skates made the most useful and modern design possible for this sliding tool. Since, then roller skates are already known to people as roller blades.
Other improvements and variations are developed to roller blades but the history started with the establishment of Rollerblade, Inc.
Not sure which rollerblades to buy see http://www.skatesetc.co.uk for great advice and a wide range of rollerblades.
Re-designed Super Quiet Compact Vaneaxial Fan
Tenderall Fan Co. offers new high pressure small vaneaxial fan that finally resolves the problem of boosting air flow in long ventilation ducts of today's large residential houses.
For a long time the efficient ventilation of remote rooms in the large houses could be done only with two independent air supply sources (like a furnace). Ventilating ductwork in contemporary large houses becomes so long and elaborated that even a high pressure furnace fan couldn't generate enough static pressure to blow through the whole length of such a duct. The existing low pressure booster duct fans, even though compact enough to be installed in-line in the house ventilation ductwork, still do not provide enough booster pressure / airflow. The usual solution to this problem was installation of two independent furnaces with different air ducts, which is rather expensive option.
A new high pressure (up to 1.5" WG) small vaneaxial Series VA fan is an ideal booster fan for prolonged ducts. Unlike inline centrifugal ventilator, that also generates rather high pressure, the air comes out not from a peripheral outlet ring area, but distributes evenly across its outlet opening like in true axial blowers.
The other advantages of VA Series vaneaxial ventilators is their intrinsic spark-resistant construction because of all-aluminum construction; quiet operation of true vaneaxial design; lower energy consumption due to efficient wheel design.
Eight different sizes from 6" DIA to 10" DIA offer wide performance range for any ventilation duct design. Direct drive design ensures long live, maintenance-free operation. Explosion proof motors are available too, as well as sliding dampers, various mounting options, additional sound isolation.
Another high pressure in-line fan developed by Tenderall Fan Co. is CB Miced Flow Fan. Mixed Flow fans are an excellent choice for return air, supply, or general ventilation applications where low sound is critical. As compared to similarly sized tubular centrifugals and vane axials, a mixed flow fan will be 5-20 dB quieter! In addition, the mixed flow wheel is extremely efficient and will cut down on operating expenses.
Unique features of the MVA Mixed Flow Fans include:
- Universal Mounting System that allows the unit to be field rotated at the job site
- Compact design with standard slip-fit duct connections for ease of installation
- UL/CSA listing for electrical is available
- Continuously welded housing with a standard powder paint finish suitable for indoor or outdoor applications
- A complete three plane vibration test of all assembled fans prior to shipment
Model MVAB:
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* Belt drive construction with motor out of the airstream
* Air Handling Quality bearings selected with a minimum life in excess of L(10) 50,000 hours at the maximum operating speed
* Performance capacities from 1,000 to 100,000 cfm (1,700 - 165,000 m3/hour) and pressures up to 8 in. wg. (2000 Pa)
Model MVAD:
* Direct drive construction eliminates belts, pulleys, and shaft bearing maintenance
* MVAD design is more compact for space critical application
* Partial wheel widths allow for wide performance capacities ranging from 500 to 105,000 cfm (900 - 170,000 m3/hour) and pressures up to 9 in. w.g. (2300PA)
For additional information please refer to http://www.tenderall.com/ahu/index.html.
Oleg Chetchel
Industrial Ventilation Systems Designer
Tenderall Fan Co.
http://www.tenderall.com/hvac/index.html
http://www.tenderall.com/inquiry/index.html
About the Author
Oleg Chetchel
Ventilation Equipment Designer
Tenderall Fan Co.
http://tenderall.com
Hamann BMW Z4: Tuner Special
German tuner Hamann tweaks the 2011 BMW Z4. | April 26, 2010 | Hamann The German tuner specifically developed a performance package for the Z4 sDrive35i, which has a twin-turbocharged 3.0-liter inline-six developing an even 300 horsepower and 300 pound-feet of torque.
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