Here in the Downdraught Files I shall indever to document the things I happen to feel like making,
so far there are only two of them, but depending on the free time I have the list might grow, you
never know! :)
Well just the other day I thought you could only fry, bake, boil, mash and soute potatoes, that was until I found www.Spudgun.com. Now these things are dangerous and I recommend that you read all the warning at the above site before attempting to build one. The design below came from spugun.com and took only a couple of hours to build and cost about £25.50 GBP. Heres what I made:
The red bit and is about 10 inches of 4inch diameter waste pipe and
forms the chamber. On the ends are external fitting screw on caps (the most expensive part)
one provides access to the chamber and the other has a union fitted to accept 1.5inch waste
pipe(36 inches long), I had to do this as I could find any glueable 1.5 to 4 inch adapters.
Next I drilled 2 holes to allow screws to be driven in, I differed from the spudgun.com specs
as I didnt have any 2.25inch screws. As these screws where shorter I couldnt bend them so I
had to wrap a piece of wire around the end of one to reduce the gap.
Well I made up a stand and have been shooting it up the field. I was suffering from wind shear and from what I paced out afterwoods they were going in excess of 100yards. Which is not bad for the core of a potato propelled by burning hairspray!
Years and years ago I was bought a book called "Windmills and Wind Motors" by F. E. Powell
ISBN 0-917914-27-9. This book describes the fabrication and construction of various windmills with
sail diameters from 1ft to 12ft. I tryed to make one with 4 sales when I first got the book that had
4 sails but at the time was rather unsuccesful. Then just the other day I found the book on my books
shelf and decided to try again.
Now as you can see it has 6 sails and is capable of steering itself into the wind. The rotation of
the blades is converted into a vertical rotating motion by a pair of equal sized bevel gears.
Now 1 is the bottom bevel gear, 2 is the housing for the bearings that carry the sails and for the top roller bearing, 3 is top roller bearing attached to the 2 by a metal ring, 4 is the bottom roller bearing attached by the same means, 5 is the base plate that hold s the whole lot to the top of the stand, last but not least 6 is the main shaft that carries the weight of the sails and the hub but also transfers the rotory motion from the sails. It can do this because of the two bearings which allow the shaft to rotate indepedantly of the hub and base plate.
The sails are made from 3ply and the arms and hub are mohogoney(I cant spell!) which we happen to have more of than any other hard wood. The sails are inclined at 30 degrees, I gave the windward side of the sails a couple of coats of sanding sealer and then rubbed them down, after giving the whole thing a couple of coats of varnish Ive got a glassy finish on the sails which will hopefully reduce the drag. As for the rest of the construction Ive used lots of brass screws and everything wood has been varnished many times, most other things have been painted.
News as off 21st of August 2002:
Created By: Anthony Godden|
Created On: 15-September-2001 Last Updated: 21-August-2002