BOOMERANG AERODYNAMICS PDF

Wurfversuche mit einer gleich schweren Replik aus Kunststoff erbrachten dennoch sehr gute Wurfeigenschaften. Sie sind ca. Nach den wissenschaftlichen Untersuchungen von Hanns Peter [10] gab es 11 Typen von australischen Bumerangs. Bumerangs wurden von den australischen Ureinwohnern auch als Grabstock , Musikinstrument oder Schlagwaffe verwendet.

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You can see a nice demonstration of this in this youtube video Now a boomerang is a bit like a gyroscope: it is spinning around and has angular momentum. BUT: there is something that makes the boomerang change its angle. That "something" is TORQUE: torque that is caused by the fact that the bit of the wing that is moving in the same direction as the boomerang "feels" more wind and thus experiences more lift than the wing moving backwards.

Now since the boomerang does not have the ability to change the angle of attack, it does experience a torque - and just as in the gyroscope, this torque causes precession. This precession is a good thing for the boomerang: if you throw it in the right way, it will change the direction it is pointing so that over time it returns back where it came from. Now the key to "flying far" is to slow down the rate of turning so it flies a long way makes a big circle.

The torque is a result of the difference in wind speed experienced by the forward moving "wing" compared to the backward moving "wing" of the boomerang. This is why you want fast rotation of the boomerang relative to the forward motion - it slows down the precession and therefore the rate at which the boomerang "turns around and comes back".

You can achieve this by making the boomerang larger - the tip moves faster, and as an added bonus you increase the moment of inertia.

As for "credible reference": this is of course a"the interwebz" so you have to be skeptical about any "advice" you read.

Take a look at how this site works, and how it has developed its own version of "peer review". Then decide if you can cite me as a "credible source". They use the same simplified model of motion for the boomerang that I used although I had not found that page when I wrote the above.

One final thing. You can easily make a miniature boomerang by cutting a piece of thin cardboard in the approximate shape of a boomerang - if you take an old playing card and cut it like this, it is just about right: Bend the edges of the card like so just a few degrees, to give it some lift : Finally, lay the card on the back of your left hand and give it a flick with your right index.

When you point it up a little bit, it will fly off and return to you. A genuine indoor boomerang.

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