on 31st October 2015 we launched our rocket. There are a photo of the rocket and a photo of the unmodified bottle in the attachment. Two bottles were used: one to build the pressure vessel, another for the payload. Rocket volume is 1,5 liters. Its weight is 150 g. We used launchpad alTImeter to measure height and deploy a parachute which slows the rocket to 7 m/s (descent ratio)
You'll watch first the ground video, then the on board one.
LAUNCH 1
Time: 15:45
Pressure: 5,9 bar (86 PSI)
Water: 480 ml (32% of pressure vessel volume)
Height: 157 feet (47.9 m)
[youtube][/youtube]
LAUNCH 2
Time: 15:52
Pressure: 6.0 bar (87 PSI)
Water: 470 ml (31%)
Height: 183 feet (55.8 m)
[youtube][/youtube]
LAUNCH 3
Time: 16:27
Pressure: 6.0 bar (87 PSI)
Water: 500 ml (33%)
Height: 157 feet (47.9 m)
[youtube][/youtube]
LAUNCH 4
We launched the rocket again but this time the rocket "self-launched" (as you can see nobody pulls the release string) because of gardena connector failure (it was not properly locked). I don't know if this launch is valid. If this launch is valid, record height will be the average of launches 2, 3, and 4. If not, height will be the average of launches 1, 2, and 3.
Time: 16:44
Pressure: 6.3 bar (91 PSI)
Water: 500 ml (33%)
Height: 187 feet (57.0 m)
[youtube][/youtube]
HEIGHT
If launch 4 is valid, height will be: (183+187+157)/3 feet = 176 feet (53,5 meters). This is the average of launches 2, 3, and 4.
If launch 4 is not valid, height will be: (157+183+157)/3 feet = 166 feet (50.5 meters). This is the average of launches 1, 2, and 3.
SIMULATOR DATA
Simulator at http://cjh.polyplex.org/rockets/simulation/ for out launches predicted apogee between 50 and 62 meters (using different coefficients of drag)
For any questions ask me
![Very Happy :D](./images/smilies/icon_biggrin.gif)
Hoping launches are valid,
![Thank You TH:](./images/smilies/thx.gif)
(P.S. Sorry for terrible grammar)