An Interesting Paper Model —Fast Moving Air Turbine

Auckland Star, Volume LXXII, Issue 109, 10 May 1941, Page 4 (Supplement)

An Interesting Paper Model — Fast Moving Air Turbine

T he first a'"' hardc-i pan to make is the bu.k,. ,hi P . ]•■,«. J' u you do not r,--! capable of cutting so many buckets, the turbine can be made with Llv three, but it will then run nlU ch more slowly. The strip of drawing paper is am long. First copy the drawing on paper making the strip full Lgth and : im wide. Measure across the width 1-Sin. lin, im and 5-81n, and draw in lines running right down the Sin. Holding your ruler lengthwise. m ark the paper from one end at i-Sin. 15-Glin. 31-fiiin and 51-64 in. The 1-Sin mcasureroent will give y>u the position of line A 'Fig. H. the otners being B. C and D. To avoid counting up a lot of 64ths on your ruler, mark off the last three dimensions on paper, and repeat them down the strip- When you come to the last bucket you will find, if your measurements are correct, that your paper is barely long enough. This does not matter, because the final '-fitting" is done later. The lines you have made will enable you to draw the outlines of all the buckets. With a sharp knife make cuts corresponding with the black lines,

Take your compasses and draw two 2iin diameter circles, and inside each another of liin in diameter: cut these out, then stick the edges of the smaller ones to the bent-over edges of the strip as shown in Fig. 2. which illustrates the small circle with the bucket ring fitted. While this part of the wheel is drying, cut seven short lines around the larger circles, part of which is shown in Fig. ;'.. then slide one on each side of the wheel, fitting the bent pieces of the buckets into the slots. This disc will be a tight fit on the wheel; if too tight cut a little off the inside. Stick down your bucket, ilaps, and the wheel is finished. Fig. 4 shows both views of llie turbine case. The sides should be drawn to the dimensions, and then cut out. being careful with all the little notches. The other piece is made with similar notches, which fit into those made in

and at the dotted lines bend the case. Stick the sides

or crease the paper, all creases the .strip, then take a pin at going downward. On the least lin long, and wrap around creased portion at each edge it a strip of paper just under you will see a number of short : ;in wide, to form a tube (which lines. These must also be cut, the pin fills) that will just go otherwise when bending the between the sides of the case, paper to form a circle the Stick the strip to itself as you edges wUI cockle. wind it on, until it is 1-Sin

jyjODLLS made ,n paper, though, of course, not as lasting as those m wood and metal, are much easier accomplished, and will P you with an interesting lew hours' labour. The one described below is an air turbine. The tools required are a pair of scissors, a sharp knife or razor blade, compass, pencil and ruler, and the materials are glue, drawing paper'and a pin. By blowing through a tube which enters our turbine case a current of air reaches the buckets arranged around the circumference of a paper wheel. The paper wheel retreats from the breeze, obtaining great speed, giving vent to a hum or shriek as the speed increases. ,

thick, then make a hole in tire centre of the wheel large enough to receive it. and stick the tube in position with the wheel in the centre. Xow cut another strip of paper IJin wide, and wrap this

round a skewer (a pencil is too large!, slicking it as you go to make a round tube. While this is drying, slip the wheel into the casing, minus the pin, then insert the pin through the case and tiny tube to the other side. Withdraw the pencil from your larger tube, and cut a hole in the side of the case to receive it. Stick the tube in so that the inner end does not foul the wheel, then, when everything has dried nicely, blow through the tube. Quite a gentle breath will send the wheel spinning, while if you use all your force a tremendous speed will be reached. The pin must, of course, he free to rotate. If you wish, a second blow tube ran be inserted at the other side of the case, pointing at the top of the wheel, then two of you can blow together. To strengthen the toy. a paper base can be glued on using notches similar to those used on the case itself, and little right-angled strips can be stuck to the blow tube where this enters the casing.

THE CLIFF DWELLERS (Concluded from last week.) "A party of men was dispatched swiftly to the village that stood beside the Puna-i-Hangarua spring, where there lived an old chief woman of the Tapuika tribe. Her the men seized (she had nothing to do with the ease, but that did not matter) and hurried her off to Puhirua, where the big house was still burning. They cast her into the naming ruins and roasted her to death. •But the vengeance was not yet complete. The Puhirua tribe and their kinsfolk of the Arawa decided to carry the war into the bush country. Raising a strong war party, they marched in to Te Pehu

and furiously assaulted that pa. They succeeded in capturing it and in killing most of the people. The survivors lied down the gorge and across the Manga-orewa, to Te Weta; there the bush tribe made a final stand. The war party from the lakes was again victorious. * "Now at last those caves come into the storj'. The remnants took refuge there in the caves which had been cut out of the solid rock cliff above the gorge (as already described in the first part of this story). The survivors did not dare to reoccupy the original cliff-top pa. They huddled into those hollowed-out kumara storeplaces, and ever keeping a watch over the Rotorua tracks, they continued to live there. living mostly on the birds of the forest. And there they lived, enlarging some of the caves, and continuing other shelters, for many years after the conquest. But at last they longed for the open lands again, and gradually they rejoined the main body of the tribe at Te Puke and Ponga-