RayGun wrote:
> Horizontal vs Vertical
> ...So if torque is sorta 'force x distance', wouldn't a vertical axis set-up
> be able to generate more torque at the hub? Thereby being able to be
> smallish in diameter, able to turn a larger (power) generator, with slower
> rpm. Rather than using 'wing' airfoil type that generates torque on a
> diminished forward angled lift vector, thereby necessitating huge rotor
> diameter systems, extremely elevated on a pedestal for ground clearance.
> And talk about noise...gawd!!!
Torque is the force. There is no distance.
The same swept area of wind could produce lots of torque and low speed
spinning (good for pumping water) or less torque and high speed spinning
(good for producing electricity).
In theory, the vertical or horizontal axis of rotation doesn't matter
regarding how much power you can extract from a particular swept area.
In practice, it's easier to build an efficient horizontal axis turbine.
Wind is slowed by ground turbulence. The higher you place your turbine,
the faster and more reliable the wind. This is why they are extremely
elevated.
A wing airfoil is more efficient than a drag airfoil and can attain
speeds in excess of the wind speed.
Most wind turbines (with a couple of exceptions) are less noisy than
a typical generator but you're going to have some noise any time you
stick something in the wind or have moving parts.
Anthony
> ...So if torque is sorta 'force x distance', wouldn't a vertical axis set-up
> be able to generate more torque at the hub? Thereby being able to be
> smallish in diameter, able to turn a larger (power) generator, with slower
> rpm. Rather than using 'wing' airfoil type that generates torque on a
> diminished forward angled lift vector, thereby necessitating huge rotor
> diameter systems, extremely elevated on a pedestal for ground clearance.
> And talk about noise...gawd!!!