Dear Friends
Part - 2:
This second diary entry of the continuation of the small 3-part basic series; - Concerns simple 2-bladed rotors made from plastic or PVC roof-guttering or pipes.
As in the previous paper - I refer to a file kindly archived on the server:
http://www.otherpower.com/images/scimages/119/Rotor_from_Plastic_Gutter.pdf
This short 3-page file is in two sections:
A: Pages 1-2 is a translation from a Danish practical hands-on 3-part school textbook from 1988 intended for young pupils and students of 11-16 years old.
"Vindmoller i Skolen" by Ole Anker Oksbjerg, Denmark 1988-90 - ISBN 87-89380-12-6
The rotor is intended to drive a PMG motor - such is as often found as a radiator cooling-fan motor in French and Italian cars.
In addition to this simple rotor the textbook fully covers the design and the pupil's own group self-construction of the different components of the system, electronic control systems, wind measurement systems and power regulation systems etc.
I may also add that f.ex. the normal local school for 11-16 year-old pupils and students in the very small rural country town of Ronde in Eastern Jutland, Denmark - has on many occasions won international innovation awards - as a result of which some of these ideas and designs are now set in production - especially in the fields of water and solar control technology.
B: The final page of this paper is an interesting download - with thanks to Mr Terry Pearson from the USA - showing a pipe-construction rotor.
- http://www.accs.net/users/cefpearson/rotor.htm
C: I also note that there has been several previous discussions concerning "blades from plastic pipe" on this discussion board - I can suggest to possible further interested readers that they should try and locate this available material in the server archives.
HOWEVER - Especially when using pipes rather than the more flexible guttering - I would advise caution and due care in construction and great care in not exceeding the suggested rotor dimensions.
NB: As previously mentioned - Part 3 will further discuss larger simple wooden blades etc.
With best wishes - JF
