A 2-stage water rocket

The 2nd flight of mý first 2-stage water wocket. Described at http://wra2.org/forum/viewtopic.php?p=2478#p2478 (my user name there: dongfang).

The booster is about 2.5 liters, with a 21 mm nozzle. The sustainer is about 1.8 liters, with a 9 mm (Gardena coupling) nozzle.

Calculated burn time of the booster is only 63 milliseconds; therefore you will just see it disappear after launch. In the same calculation, the booster separates at just 1.8 meters, but at a vertical velocity of about 35 m/s.

The pressure was 7.5 bar.

Category:

Science & Technology

Tags:

• water
• rocket

[skuula]

Hi,

Try read the info text. Separation is milliseconds after launch. The booster helps very little in terms of separation altitude - but a lot in terms of speed.

[skuula]

Hi, try see the description. Separation is after about 60 milliseconds....

[BigHairyTroll]

I still have the feeling you would gain height by separating a little later.

Great video!