X Greetings! You are not currently logged in, but please don't let that stop you from voting up any videos you like. :)
|
| |
|
zomgg Member Profile Member Since: 2007-04-24 Last Power Points used: never • Available: now Max Power Points: 1 • Get More Power Points Now Comments 1 |
Subscribe Navigation
Member Stats Rank: 641 Rating: 5 star points Top 15 Videos: 1 Votes Received: 227 Average Votes Per Video: 45.40 Votes Cast: 181 Comments Posted: 32 • browse Comments Applauded: 1 Sifted Videos: 5 Unsifted Vids: 1 Profile Views: 2243 Highest Ranked Comments Member's Highest Rated Videos |
Videos Submitted by zomgg
In reply to this comment by zomgg:
One comment for all those who will play this, after you beat the game, look online about the Stars. The effort is worth it.
In reply to this comment by zomgg:
These types of videos make me kinda sad, the destruction of something so beautiful and useful is a little depressing.
>> ^budzos:
I heard it's a challenge to keep the blade tips on these huge windmills from creating sonic booms.
To check this we can look at the velocity of the tips of a blade, and compare with the speed of sound to see if a sonic boom will occur. According to Wikipedia, common modern wind turbines have a blade radius of 20 to 40 m. Taking an average of 30 m:
velocity = rate of rotation x radius
speed of sound = 343 m/s
radius = 30 m
rate of rotation where the tips are approaching the speed of sound = 109 rpm
This is much greater than the common operating parameter of 10-22 rpm
For the worlds biggest turbine (according to Wikipedia), r = 63 m
rate of rotation where the tips are approaching the speed of sound = 52 rpm
So it does pose a problem for really big turbines, but in general can be avoided for average turbines. Also, note that with any wind speed the required rotation rate will be slightly lower, since the velocity at the tips will be the combination of the wind and the rotating speed.
The more you know!
src: http://en.wikipedia.org/wiki/Wind_turbine