[Ferro List] fc for DAWT construction

[paul at ferrocement.net]

Hi Chris,

Right you are. This paper is about a wind tubine produced in New Zealand.
DAWT stands for Diffuser Augmented Wind Turbine.

A paper [not the same one as pdf whose link you provided] was presented by
R. C. K. Alexander [Principal, Robert Alexander & Associates Ltd,
Consulting Engineers, Auckland new Zealand] at the FERRO-7 symposium in
Singapore, 2001, which I attended.

'Technical Aspects for the Construction of a Ferrocement Augmented Wind
Turbine Diffuser' pp.347-358 of the symposium proceedings.

"As part of the development program a small scale protorype DAWT with an
inlet diameter of 7.3m and an exit diameter of 13.5m, was constructed to
primarily verify the wind tunnel results. As ferrocement had been
identified as a suitable material for the shell construction because of
its strength and economy, the prototype also provided an opportunity to
evaluate a number of ferrocement construction techniques. These techniques
included the curving of flat plates and laminating to form dual skin
sections, use of a ferrocement ring truss, and the full moment bolting
connections between diffuser segments. the design for a number of these
techniques was verified by an experimental testing program."

Note they refer to a turbine with an inlet diameter of 7.3 meters as a
small turbine. This is cited in the symposia paper as 1/8 the size of the
proposed production machines.

Thanks for finding and posting this link.

Paul

> this site is some sort of technical or scientic sight.
> The black and white drawing are great ( more about DwAT), fc is in charts,
> as far as i can tell, fc compents are used in some sort of wind turbine?
>
> http://www.nrel.gov/docs/legosti/old/98073-1B.pdf
>
>
> material used for the diffuser. The turbine assembly weight increases
> slowly
> with rotor size change.