-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Martin Spott schrieb: > Christian Mayer wrote: > > >>There are 3 possibilities > > > This is a bit different from the wind turbines we have near EDLN > (Cologne area). If the wind is too high they feather their blades but > still are being turned to face the wind - I think this is being > required by the layout of the hub structure. > When the wind is 'right' they rotate at a speed that is depending on > the wind speed. The conversion into alternating current of a fixed > frequency is being done electronically already for a looong time. > > I think this applies to almost all German and Dutch wind turbines that > _I_ have ever seen (and I'm already in the mid-thirties) - not that I > claim to have seen all wind turbines in our country .... :-) > > Martin.
Ok, I had a look at wikipedia. The german article is quite large and has a bit more information than the english one. The most interesting bits for a model would be: The highest efficiency is, when the tips of the blades run 8 times faster than the wind speed. Energy is produced in the range from 2 - 4 m/s to 25 - 35 m/s. Below it's not efficient enough and the generator is cut from the net. The rotor isn't braked though as it would produce too high forces (so it rotates very slowly) Above the speed it depends. Some turbines adjust the pitch (but still face the wind) and others are turned out of the wind and their rotor is fastened by a brake. Modern turbines have a extra storm regulation that allows them to work during a storm with reduced efficiency Basicly the article said that every regulation that we can think of was used somewhere... So we hardly can produce a modell that is totally off... CU, Christian -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.0 (MingW32) Comment: Using GnuPG with Thunderbird - http://enigmail.mozdev.org iD8DBQFB9PHklhWtxOxWNFcRAmJgAKCbJTMLbZP5rSca97b629hsnmkRyACgnnWu PF5XfcS4bi9l0w94N1RdfFc= =reqJ -----END PGP SIGNATURE----- _______________________________________________ Flightgear-devel mailing list Flightgear-devel@flightgear.org http://mail.flightgear.org/mailman/listinfo/flightgear-devel 2f585eeea02e2c79d7b1d8c4963bae2d
