> On 28-6-2012 1:15, rodv92 wrote:
>> Feel free to comment and thank you again to the community for the
>> great and fast
>> like light support ! ;-)
>
> Adding to what Alain already said:
> - The blades of the wind turbines seem too thin and/or too long to me.
> They will not survive any significant wind nor are they efficient enough
> to catch any wind in the first place probably.
> - The landscape is in need of some relief. Even a flat desert is not
> "flat". A gentle height_field or isosurface will probably do wonders.
> - Textures. Time to give some variations to the textures which are now
> too uniform. Use colour or pigment maps.
> - All power lines, including those for the trains should be thinner I
> think, with a thickness variation between the main power line and the
> supporting ones.
> - Sunlight is coming from due left (not from behind). Try to avoid such
> geometrically perfect fits to the landscape. I would suggest to move the
> sun towards a position further away giving some interesting shadows on
> the structures (and the landscape) by back lighting.
>
> Otherwise, this is becoming an interesting scene indeed. As Alain said,
> keep in mind the different sizes of the structures, especially in
> relation to each other. Always build from a common scale base (feet,
> meters, pov units) and take into account "real" sizes where possible.
>
> Thomas

If you look carefully at real wind turbines, you'll notice that the 
blades are indeed prety thin relative to the lenght.
Here, the bigger difference from real turbines is that the thickest part 
is slightly past the mid point (about 55% radius) while normaly, it's 
much closer to the axis, around 10% radius, and often show a slightly 
pointy bit. Leading edge straight all the way, oposite edge curves 
backward to the thickest point at about 10 to 15% radius, then taper 
down in an almost straight line to the narrow tip.

If the turbines have 3 blades, it's because it proven to be more 
effecient than 4 of the same desing. 3 blades turbines give MORE power 
than 4 bladed ones and 5 bladed ones are not practical: To much drag for 
the power, the pilon need to be almost 3 times bigger than for a 3 
bladed model.
There are some 2 blades desings where the blades are no bigger. They 
give only slightly less power with 1/3 less blade area and need thiner 
and lighter pilons, and there have even been some single, thin, blade 
prototypes built... Those look prety strange with the counter weight.



Alain

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