Re: Copy the Tyco "terrain Twister" screw drive?

In lugnet.org.ca.rtltoronto, Rob Antonishen wrote:
> I saw the Tyco "Terrain Twister"
> http://www.tycorc.com/us/product.asp?category_type_id=22&id=11811&category_id=7819
> advertised on TV and was intrigued by the drive mechanism.
>
> It looks like it uses two counter-rotating screws/augers to move it
> forward on bad surfaces like sand or snow.

I remember this toy!  Wow, Tyco must be where old molds never die.

> Any thoughts on how this could be built as a robot drive base?
>
> I've tried using flextube but haven't been able to duplicate this in Lego.

I don't know of any pieces which would fit the shape, but then of course, I'm
really not as up on my piece knowledge anymore.  There doesn't seem to be a
"worm segment" piece other than the actual regular worm piece Chris loves so
much.  There are those neat Castle stairpieces which are a "sweep of arc" but I
don't think you could make a giant worm out of them.  

How about tirehub cylinders wrapped in flextube?

Calum