This is a version that uses a [S] shaped rotor, a configuration I have not seen before. Using a S shaped rotor and a belt driven generator results in speed to low for normal electrical generation. This is different in the sense that it uses no belt drive.
The materials are Aluminium Sheeting which can be obtaining from newspaper printers as they cannot reuse it again and it could cost as little as 60 cents a sheet.
Two 3/8 inch screwed rods to the length of sail height and the extra length required for the connection nuts one inch screwed rod [ the length as above ]
A couple of one inch diameter ball bearing races and retainers. A selection of nuts and bolts or rivets Three pieces large card board 1/4" or thicker the better. A large base plate this can be metal or wood but must be able to be secured so that the wind does not blow assembly over.
A collection of permanent bar magnets or electro magnets.
Construction
With the aluminium sheeting cut six circles to the diameters you wish each will need a one inch hole in centre of each circle. drill also two 3/8 holes on the outer diameter on the same radius from the centre, these will be used by the 3/8 inch screwed thread in supporting the outer portions of the sail wings.
You will need to make three of the following
Cut a sheet of cardboard to the exact diameter of the aluminium circles.
The cardboard is used to add strength to the sandwich construction without adding too much extra weight.
Make a sandwich with the cardboard in the center and two aluminium circles on the outside. Drill holes on outer diameter of circles and bolt together the construction together. Weather proof the cardboard with paint and weather proofing compound.
Please note plywood could also be used in placed of cardboard but will add extra weight to the unit.
You should now have three thick disks sandwiches.
One will be used for the top and the other two will be for the bottom under sail and the other to mount the magnets.
Work out the size you wish the curved sails to be and cut aluminium sheeting to size ,also leave two inch tabs on the top ,bottom and the two sides.
The tabs are then drilled ready for rivets
Bend all tabs 90 degrees and place a sheet in a {C} curve shape on the top plate and then rivet to the top sandwich disk
Do this with the other sheet but in opposite direction so that you end up with a [S] shape rotor.
Insert one inch rod to top sandwich, bolt into position and rivet centre side tabs together around the 1" centre rod.
Insert the two 3/8 inch rods into sandwich wing outer support holes bend over outer wing tabs and rivet together.
Do the above to the bottom plate and bolt into position.
On the remaining sandwich cylinder place your permanent magnets on the outer diameter,equally space them, all can be facing the same directions or alternate them.
You could also use bar electromagnets but a couple slip rings would be need to be included in the design.
Fix magnets in position.
Fix bottom plate to rest of assembly with one inch nuts
Then put 1 inch rotor ends in bearing race on bottom of support plate and make top support for upper bearing support and then fix it to bottom support.
Field magnets maybe transformer [I] shaped pieces wound with copper wire and mounted as you wish. You will need to experiment with coil windings and core types to get desired voltages and currents.
Fix field pickup coils [ bar type ] into position on the support base and line up with rotor assembly magnets.
You may try any configuration you wish so that you get pulsating dc or ac, remember only one end of each field magnet pole is used, the other faces away.
Make sure unit is secure so that any wind gust will not flip the device over.
