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A water rocket is a type of model rocket using water as its reaction mass. The pressure vessel (the engine of the rocket) is constructed from thin plastic or other non metallic materials (usually a used plastic soft drink bottle) weighing 1,500 grams or less. The water is forced out by compressed air. It is an example of Newton's third law of motion.

Sabot WR

Discussion about Compressors, hose, pipes, fittings, launchers, release mechanisms, and launch tubes.
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RaZias
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Sabot WR

Post by RaZias » Sun Apr 11, 2010 3:19 pm

Here is the Sabot application to a Water-rocket.

This will allow to reinforce during the launching, the reinforcement will be ejected because only the surrounding tube is keeping it in place.

By being released the rocket won´t have to travel with the travel of the reinforcement.

It won´t blast after the reinforcement ejection because it has already a 22m hole to make the air escape.

There are 3 issues:

1 - Shape the Sabot around the rocket, avoiding making micro spaces between the Sabot´s and rocket´s
surfaces.
What material to use ? A liquid that would dry around the rocket making a plastic shell ?
Where I could find it ?

2 - Drag force from the friction between the Sabot and the tube

3 - The tube shape must match the Sabot diameter.
Sabot-rocket.jpg
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Brian
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Re: Sabot WR

Post by Brian » Mon Apr 12, 2010 2:55 am

There are 3 issues:

1 - Shape the Sabot around the rocket, avoiding making micro spaces between the Sabot´s and rocket´s
surfaces.
What material to use ? A liquid that would dry around the rocket making a plastic shell ?
Where I could find it ?
maybe coat a bottle with carbon fibre then cut it in 2 haves or more?
2 - Drag force from the friction between the Sabot and the tube
the rocket can expand into the tube then shrink out after launch.
or the tube can go up with the rocket holding the 2 haves then when the pressure is lower the rocket will shrink and the tube would slip off and then the reinforcing.
3 - The tube shape must match the Sabot diameter.
maybe shrink a larger bottles cylindrical section with hot water. I've found that 75 degrees C is a good temperature to shrink bottles.


Ascender Water Rockets
http://ascenderwaterrockets.weebly.com/
https://www.youtube.com/channel/UCS2NHXS-VFxEux70DCINR0w

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