Lift off 2 x 2 litre

These are photographs taken of the first launches of the 2 x 2 litre rocket which flew to around 250 feet.

Typical set of rockets for a day's launching. The 1 litre and 1 litre 'Egglofters' together with the 2 x 2 litre rocket and a bottle of water with food colouring in it.

Off to the right of the launcher, the release string extends for a further 20 metres or so along firm ground so that the person who pumps up the pressure (me) does not slip in the mud if he has to hurry back for some reason.

The 2 x 2 litre and the 1 litre 'Egglofter' are both already filled and have been take to the launch site with tops on. Doing this gives an extra launch per rocket.

This is it. All ready to go, sitting with 1.6 litres of water in the lower bottle.

Note that the plastic sleeve on the launcher fits up, inside the skirt of the rocket with plenty of clearance. This launcher, even with its temporary mounting on a swingball base, can take rockets with skirts upto a foot long.

Also visible in this picture is the bulge in the gaffer tape on the left CD ROM where the loose end of the cable tie goes. This helps to keep the fin in a reasonable position. Note that the cable ties fit around the skirt in a place that is not in direct contact with the pressurised bottle.

In addition to this, the waist in the middle, supporting section can be seen and the fact that the upper bottle is not taped in place. By keeping the upper bottle free in this way, it may be replaced if it becomes unacceptably damaged.

This is a photograph of the 2 x 2 litre rocket that has been enhanced with edge detection again.

On the left, the green dyed spray is clearly visible although, again, the rocket is blurred because of the combined movement of the rocket and the camera.

On the right, the edge detect has picked up the shape of the spray above the level of the horizon and shows that the compressed air from the rocket has blown back the very top of the column of water to form the cone shape that is visible.

To the great amusement of the people playing football on the adjacent fields, the ground crew counted down at the tops of their voices bofore the rocket went off.

The rocket stayed in the air for around 9 seconds - taking 5 seconds to get from apogee back to earth

When it did get back to earth, it did so at quite a speed.

If this sort of damage is too great (this one survived a pressure test and went on to perform many more launches and has only recently been retired - I needed the parts for something else) then the top bottle can simply be unscrewed and replaced

Next project on the list is a recovery system.


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