Lift off 1 litre Power Rocket

These are photographs taken of the rocket. It has been around a while and has had numersous launches - hence the quantity of tape on it.

This is it on the carpet at home. You can see the construction and there is a tape up the side that has lines on it to make measurements in the field easier.

The nose is covered with pennies and then tape to make it smoother.

The rear third is a reasonably smooth taper which gives the rocket a good coefficient of drag.

When this one goes up, it is nothing more than just a small dot very quickly.

Once it hit the soft playing field, it burried the nose and the decelleration was so great that for the first time, one of the fins came almost all fo the way off. Using taped down tabs to keep the fins in place makes them very resilient and they can withstand the acceleration of launch where the rocket acclerates over a few feet but on hitting the ground, this one only had 3 inches of soil to stop it.

Normally, it bounces but this time, it just stopped.

As you can see, the ground was quite soft and the hole was perfectly shaped.

A bit of tape and the fin was back in place ready for the next launch.

Fourier transform of sound file

Click here to hear a sound file of a launch of this rocket [Real Media].

The Fourier Transform (spectrum analysis) on the left is a plot of amplitude (colour) against frequency (vertical axis) and time (horizontal axis).

As you play the sound file, you will be able to hear the parts as you see them.

The spectrum analysis was performed using Wave Tracer Version 3.2
5 - Five    4 - Four    3 - Three    2 - Two    1 - One    0 - Blastoff    R - Release    W - Water hitting the grass    I - Impact. Quite a thud for saying that this was around 20 metres away from the recorder which was on the ground.


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