So I'm trying to get a cylinder along a spiral nurb path.
But in the proces it deforms it and it isn't following the path at all.
What am I doing wrong?

Spiral nurbspath.blend

I've also tried it with the screw modifier, but I can't get the spiral transformed to a path..

I'll keep trying. Thank you

Reply to post of user Mikhail Luzyanin
It's made with two modifiers Array and Curve. First modifier make multiple copies of a small piece of tube and shift it by one of the axis. Second modifier bend this geometry by simple spline curve. Look at this artile.

As always I have luck on my side, the tutoriallink is broken.. Shrinkwrap

And what do you mean exactly with "shift it by one of the axis"?

The geometry. When I go to edit mode your cylinder has a spline and whatever I do, I still got the faces of the rounding of the cylinder. And the arrows are projected on the spline of the cylinder it seems.

Edit: Attached images and clarification.
2.PNG
3.PNG

Reply to post of user Mikhail Luzyanin
UVMap used to locate an arrow, just unwrapped to the center of the image. It also unwrapped in line and used as mask for coloring arrows.

Could you elaborate on this? How is the 'skeleton' of the cylinder created as well?

Thank you! That's a really big help!

I almost understand how everything is made.. Except when I re-create it I somewhere mess up or miss a critical step.. I reckon that it has to do with the UV-map? How can I position the arrows the right way along the tube?
Arrows_in_tube.blend

That is awesome! Thank you!

However, it seems to have the restriction of one color. Where can I find more information about this technique(s)/build-up (speed of animation, etc)?
I want have a transition from blue to red (heat) and so I tried to use a Colorramp with the nodes (image). Without any luck.. It just shows one solid color.

So, total newbie here.

I've created in blender a particle emitter with as Dupli Object arrows (made with cubes).
With the moving arrows I want to show the flow of air through a pipe. Works great!

Then I switched to B4W engine.. With the particle emitter I've to choose a Halo or Billboard for render.. So the nice flow of arrows stopped working and I can't find a alternative solution on the web.

Can someone point me in the right direction to get a looped arrow flow simulation in B4W?