RF Cafe Software
About RF Cafe
1996 - 2022
BSEE - KB3UON
RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The Internet was still largely an unknown entity at the time and not much was available in the form of WYSIWYG ...
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On Wednesday, May 28, 2008, while trekking in a U-Haul truck from Mt. Airy, NC, to our new home in Erie, PA, we pulled off at a travelers' center along I79 in West Virginia for a bit of a rest. While on the exit road heading into the parking area, I noticed what at first appeared to be a very long, slender wing - perhaps from a high performance sailplane. As we got closer, I could tell that the aspect ratio was much too high to be an airplane wing, and once the round root section came into view, it became apparent that the behemoth was a blade from a very large wind turbine. In fact, it was a 130-foot-long replacement blade headed for the Maple Ridge Wind Farm, in Lowville, NY (which is a misnomer because the site was selected for its elevation). According to the tractor trailer driver, the blades have a nasty habit of slapping the tower shaft when certain wind conditions prevail, and the composite blades shatter utterly in the cold temperatures of upstate New York (or maybe when a turkey or vulture - or small Cessna - flies into one ;).
Here is a facility that machines the massive (20-ton) rotor hubs for another company's turbines using state-of-the-art CNC machining.
Thanks to Terry W. for the link.
This wind turbine blade was shipping out of Texas, where it was transferred from the tractor that brought it from the manufacturing plant of Vestas, in Brazil (headquartered in Denmark, where they have been building windmills for a looooong time). Vestas began construction on its first U.S. blade manufacturing facility in Colorado in 2007. In 2008, a Vestas R&D Center opened in Texas. They have facilities all over the world.
The Maple Ridge Wind Farm turbines are Vestas model V82-1.65 MW, which are 82 meters in diameter and, you guessed it, produce up to 1.65 MW of power. From press releases, it appears these models sell for around $2,5000,000US. I do not know if that is an installed price.
There are 68 attachment bolts - a highway officer that was weighing the load (notice the scales under the wheels) climbed up and counter them. It is hard to tell from the photos, but the blade was so long that a separate wheeled trailer was attached near the tip.
According to Forbes:
"Vestas Wind Systems market share for wind turbine generators (WTG) [had] a leading stake of 25% in 2006." "Vestas' competitors GE, Enercon and Gamesa Eolica had around 15% each of the market, while Siemens Wind Power and Suzlon held market shares just below 10% each, MAKE Consulting said."
According to Vestas, "We install a wind turbine every four hours. Globally."
Do a Google search on vestas order and you will be amazed at how many they sell! This high oil price market is a real boon for Vestas.
Hmmm... Come to think of it, I wonder if anyone checked to see if there were any Illegals hiding inside that thing?????
You just never know what interesting thing you are going to see. The ubiquity of picture-taking devices nearly guarantees somebody, somewhere, will capture just about everything that happens. A Cool Pic indeed!
These images have been chosen for their uniqueness. Subject matter ranges from historic events, to really cool phenomena in science and engineering, to relevant place, to ingenious contraptions, to interesting products (which now has its own dedicated Featured Product category).
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