[Ferro List] fc for DAWT construction

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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. Because the wind power conversion potential increases
with the second power of rotor diameter change, the ratio of DAWT weight-topower
changes much slower than the weight alone (see sheet 2 of Fig. 2-16).
For ferrocement construction of the diffuser the relative weight/power ratio
is almost constant as rotor size increases, as shown in Fig. 2-16 (sheet 2).
While th

The local production centers probably will require adjunct concrete batch
plants to make the desired mortar-mix if economical arrangements cannot
otherwise be concluded with local, pre-existing concrete suppliers. Steam
curing equipment permits more efficient use of molds by reducing to about 2
days the time for obtaining full cement strength from the usual 28 days. This
equipment requires a fresh water supply and source of heat energy.
As illustrated in Fig. 3-1, molds for batch production quantities of 100 or
more sets of DAWT components are made of steel and can be dismantled and
reused elsewhere. These molds are sized to produce diffuser segments that are
within the dimension and weight restrictions of highway shipment. Figure 3-2
shows typical shipping orientations. A set of the cast segments for one
diffuser is assembled together at the installation site by bolting their
flanges, at ground level. The complete assembly is then lifted onto the
prepared foundation by a mobile crane, rented locally, as shown in Fig. 3-2.
Large arrays of DAWTs promote high efficiency use of the special crane
equipment and help to reduce the rental charge per unit installation.
For a single or small number of ferrocement diffusers the casting mold can be
made of ferrocement. The advantage lies primarily in lower cost (about half
that of the steel mold) and quicker availability because of the eliminated
machining of a steel mold.
3.2.2 Fiberglass Reinforced Plastics

3.2.1 Ferrocement
In Section 2.0 it was concluded that only the small and intermediate sized
diffuser could be designed in ferrocement with any confidence because of the
present state of knowledge and exper'jence. The David J. Seymour organization
indicates that indoor production facilities in former warehouses and even
barns could be used to satisfy the batch lot manufacturing requirements of the
diffuser structure. The marketing region would be serviced by this production
center until market saturation would be achieved. This market centered
manufacturing approach has the effect of reducing product transportation
costs, of minimizing plant investment* and greatly involving local labor and
locally rented heavy equipment, although for the relatively short term (i.e.,
less than 10 years.)
The latter aspect of duration could take advantage of a locally low cost, but
perhaps less dedicated or less productive labor pool than provisions for long
term commitment. On the other hand ferrocement fabrication requires
relatively unskilled labor, for the most part, so investment in training
should not be great. The critical human element problem to

*This simplifying assumption for ferrocement does not affect the general
conclusions of this report. SERI reviewers caution that a more rigorous



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