Like many design considerations, the number of blades on a wind turbine is a compromise. Each blade disturbs the air for the following blade, so ideally you want as few blades as possible to maximise efficiency. You need to have at least two to keep the turbine balanced, and the longer the blade the more energy it will harvest. But if too long, the blade tips will approach the speed of sound as they rotate, which curtails efficiency.
Historical List of Video of the Day:
If the video you are looking for is not the one being previewed today, here is our historical list (click on hyperlink to view):
Econintersect wants your comments,
data and opinion on the articles posted. As the internet is a
"war zone" of trolls, hackers and spammers - Econintersect must balance its
defences against ease of commenting. We have joined with Livefyre
to manage our comment streams.
To comment, using Livefyre just click the "Sign In" button at the top-left corner of
the comment box below. You can create a commenting account using your
favorite social network such as Twitter, Facebook, Google+, LinkedIn or
Open ID - or open a Livefyre account using your email address.
You can also comment using Facebook directly using he comment block below.
>>>>> Scroll down to view and make comments <<<<<<
Econintersect Video of the Day
Print this page or create a PDF file of this page
The growing use of ad blocking software is creating a shortfall in covering our fixed expenses. Please consider a donation to Econintersect to allow continuing output of quality and balanced financial and economic news and analysis.
Take a look at what is going on inside of Econintersect.com