Wind Turbine Blade

I don't know which is more important in this case, "LOL" or "GA".........but I had to give you one and say the other......

We all know what is "solid" around here don't we!

Not altogether true, I am told after having a wonderful discussion with my giant bamboo tree/bush/plant.

Because a hollow pipe is lighter than a solid rod at the same diameter, the hollow pipe would have a larger diameter in order to match weights with the solid rod.

As in all things equal, the tube is more flexible and will have more tendency to bend and not stay bent, but the tube will be a great diameter than the solid rod. The solid rob will bend and stay bent. Less flexible!

But the cavity, its there to cause a force to 'turn/move' the blade on its axis.

My bamboo says Hello

We are not matching weights with the solid rod, you are, I'd say.

You miss the point, I fear.

'Tubes are stornger per unit weight than solids. Ask a Bamboo plant.
Del'

I agree. Simply answering your previous statement.

So whats wrong with greater diameter? It gives better rigidity.
Airplane wings are hollow.

Trees are pretty much designed to handle the wind, they are wider at the base.. ok they are not hollow. It's all a trade off depending on what you want, light weight, rigidity, low cost, ease of manufacture and transport and a hollow cavity to hide you stash.

I can't imagine any sensible design from homogenous solid material on a large scale unless it was some sort of foam or composite which would arguably not be homogenous or solid.
Wood whould be ok, it works for trees, but think of the horrendous weight and the area needed to give a firm mounting. Bonkers.
If you don't like hollow, simply fill the root with polyeurathane foam.
And why ask questions when you don't want the answer?
Del

GA

You are on a roll here, well done!!

Yah, pretty much. You'll have to scroll down a bit.

http://www.theatlantic.com/infocus/2012/01/america-at-work/100221/

Look up Inertia for the cross sections.

The #1 failing point on wind turbine blades for me has been because of those damn hollowed out roots or manufacturing defects that left voids in the roots.

That is the point on a blade that sees the most compound forces and thusly needs to have the most structural material in it which means to me that any blade that has a hollow root or a small root is designed to fail there on purpose.

Now, you are naughty on purpose.

Who on Earth would do such green travesty on purpose?

Or too stupid not too?

Naah!

They performed resonance analysis on the blade in

many different systems to make it sure? Did not they?

I have to check my own understanding in the matter.