Geocaching.com


Geocaching

Welcome, Visitor!

Sign In | Create Account

Sign in with Facebook


or

Sign in with Geocaching

Forgot Username/Password

Traditional Geocache

Vertical-Axis Wind Turbine

A cache by Panther in the Den
Hidden : 5/20/2013
In Illinois, United States
Difficulty:
1.5 out of 5
Terrain:
1.5 out of 5

Size: Size: micro (micro)

Join now to view geocache location details. It's free!

Watch

How Geocaching Works

Please note Use of geocaching.com services is subject to the terms and conditions in our disclaimer.

Geocache Description:



A Magnetic Keyholder.

I always appreciate when individuals or company's install these alternative forms of energy and feel I should bring it to peoples attention. :)




From Wikipedia...

Vertical-axis wind turbines (or VAWTs) have the main rotor shaft arranged vertically. Key advantages of this arrangement are that the turbine does not need to be pointed into the wind to be effective. This is an advantage on sites where the wind direction is highly variable, for example when integrated into buildings. The key disadvantages include the low rotational speed with the consequential higher torque and hence higher cost of the drive train, the inherently lower power coefficient, the 360 degree rotation of the airfoil within the wind flow during each cycle and hence the highly dynamic loading on the blade, the pulsating torque generated by some rotor designs on the drive train, and the difficulty of modeling the wind flow accurately and hence the challenges of analyzing and designing the rotor prior to fabricating a prototype.

With a vertical axis, the generator and gearbox can be placed near the ground, using a direct drive from the rotor assembly to the ground-based gearbox, hence improving accessibility for maintenance.

When a turbine is mounted on a rooftop, the building generally redirects wind over the roof and this can double the wind speed at the turbine. If the height of the rooftop mounted turbine tower is approximately 50% of the building height, this is near the optimum for maximum wind energy and minimum wind turbulence. It should be borne in mind that wind speeds within the built environment are generally much lower than at exposed rural sites, noise may be a concern and an existing structure may not adequately resist the additional stress.

Enjoy a short movie?

Additional Hints (Decrypt)

Haqre gur onfr arne gur uvatr

Decryption Key

A|B|C|D|E|F|G|H|I|J|K|L|M
-------------------------
N|O|P|Q|R|S|T|U|V|W|X|Y|Z

(letter above equals below, and vice versa)

Attributes

No attributes available

Advertising with Us

Inventory

There are no Trackables in this cache.

 

Find...

87 Logged Visits

Found it 79     Write note 5     Publish Listing 1     Needs Maintenance 2     

View Logbook | View the Image Gallery of 9 images

**Warning! Spoilers may be included in the descriptions or links.

Current Time:
Last Updated: on 9/16/2014 12:31:15 PM Pacific Daylight Time (7:31 PM GMT)
Rendered From:Unknown
Coordinates are in the WGS84 datum