last updated: 21st october 2023 - Day 226 to Day 230 - Various Experiments

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Flight Log Updates

#230 - Tajfun 2 L2

#229 - Mac Uni AON

#228 - Tajfun 2 Elec.

#227 - Zip Line

#226 - DIY Barometer

#225 - Air Pressure Exp.

#224 - Tajfun 2

#221 - Horizon Deploy

#215 - Deployable Boom

#205 - Tall Tripod

#204 - Horizon Deploy

#203 - Thunda 2

#202 - Horizon Launcher

#201 - Flour Rockets

#197 - Dark Shadow II

#196 - Coming Soon

#195 - 3D Printed Rocket

#194 - TP Roll Drop

#193 - Coming Soon

#192 - Stager Tests

#191 - Horizon

#190 - Polaron G3

#189 - Casual Flights

#188 - Skittles Part #2

#187 - Skittles Part #1

#186 - Level 1 HPR

#185 - Liquids in Zero-G

#184 - More Axion G6

#183 - Axion G6

#182 - Casual Flights

#181 - Acoustic Apogee 2

#180 - Light Shadow

#179 - Stratologger

#178 - Acoustic Apogee 1

#177 - Reefing Chutes

#176 - 10 Years

#175 - NSWRA Events

#174 - Mullaley Launch

#173 - Oobleck Rocket

#172 - Coming Soon

#171 - Measuring Altitude

#170 - How Much Water?

#169 - Windy

#168 - Casual Flights 2

#167 - Casual Flights

#166 - Dark Shadow II

#165 - Liquid Density 2

#164 - Liquid Density 1

#163 - Channel 7 News

#162 - Axion and Polaron

#161 - Fog and Boom

#1 to #160 (Updates)



Each flight log entry usually represents a launch or test day, and describes the events that took place.
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Day 34 - Vertical Races
It takes about 45 minutes to set up all three launchers and rockets for the first flight.
Pressurised and ready to go.
Finally a simultaneous launch of all three rockets.
A view from onboard J4 II looking back at Acceleron II zip past. Paul and John watching on (lower right)
... A few moments later, "OO" is seen also overtaking J4 II.
Although the launch was nearly simultaneous, the foam inside J4 II and OO made them take off a lot slower. Acceleron II just makes foam on the ground.
All three rockets shown just as the parachutes open.
A close-up of J4 II just before landing.
Attempt number 3. All the rockets are filled with a water/bubble bath mix.
J4 II and Acceleron II (upper right) returning to earth.
Just before complete sunrise ... it's raining rockets already.
J4 II on a wild foam ride.
Date: 6th May 2007      6:45am - 9:15 am
Denzil Joyce Oval. (launch site #4)
Lightly overcast and cooler temperatures. Calm at first, light breeze later.
(click the name for rocket details)
Name Capacity Notes
Acceleron II 18.75 L This rocket remained in the same configuration as the last flight day.
J4 II 5 L This rocket remained in the same configuration as the last flight day.
OO 2.5 L This rocket remained in the same configuration since it last flew.

Team Members at Launch Event: PK, GK, John K and Paul K.
Number of launches:

We enjoyed the triple launches last time, but since we didn't get a true synchronised launch of all three rockets we decided to have another attempt. The launches looked like vertical races, as they would overtake each other on the way up.

Flight Day Events

  • For the first attempt we were going to fly three rockets as well as having two on-board cameras on different rockets so that they could film each other. Only one of the videos came out, but it managed to capture the other two rockets in flight. We are not sure why the other camera didn't record anything. It could have been caused by the landing interrupting the power supply or I simply didn't press the shutter release button properly.

    For this we just used a big piece of gaffer tape to tape the camera onto the side of the rocket.
  • The secondary parachute on Acceleron II became tangled between the booster segments but luckily the main chute was enough to bring it down to a safe landing.
  • On two of the three occasions we were able to get all three launched at exactly the same time. On the third attempt we put bubble bath in with the water for all three rockets. Acceleron doesn't use Jet Foaming, and also doesn't produce foam during filling and so its thrust was more or less that of normal water. It sure created lots of foam on and around the launch pad though.
  • There were no real hard landings during the day so we only have a few minor repairs for next time.
  • On Acceleron II's second flight it managed to break its previous flight time record. Its new flight time record is 20.68 seconds.
  • On Acceleron II's last flight the bottom aluminium bracket was bent on landing and so will need to be straightened and re-aligned. Acceleron is about to get an upgrade so it is a good time to pull it apart again.
  • On J4 II's last flight it came down virtually on top of Peter. He saw it coming as he was looking up at it, and tried to catch it. It was coming down under parachute so it wasn't too dangerous...luckily.
  • We flew J4 II alone with foam in the last three flights so the kids could have a turn launching them. It is quite evident at how slow and out of control those flights are. I think the fins need to be placed a long way back in order to have a more stable flight when using foam.
  • The parachute deployed early on all three foam flights. On a couple of them the parachute was fully open while the rocket was still thrusting. That makes for a nice corkscrew effect.
  • Having used up all the water we brought with us - about 24 liters, we decided to call it a day. All in all it was a very enjoyable launch day, with no major dramas, and the rockets performed really well. We will now do some more work on Acceleron II to increase its capacity as well as, replace J4's payload section with v1.3 Flight computer to stop those early deploys.

    Polaron IV is also under construction so we will most likely fly it on our next launch day.

(If the video does not play, try the latest Flash player from Macromedia)

Flight Record

Launch Rocket Pressure (PSI) Notes
1a Acceleron II 120 Flown with camera, but camera failed to record. Very good flight, although the secondary parachute was tangled between the boosters.
1b J4 II 120 Flown with camera. Very good flight, although the parachute opened a little early. Used a 7mm nozzle to reduce takeoff speed.
1c OO 120 Good flight. Flown with a 7mm nozzle.
2a Acceleron II 120 Great flight, without a camera. Parachute deployed well and rocket landed well. 20.68 second flight
2b J4 II 120 Good flight, no camera on board. Parachute opened too early.
2c OO 120 Good flight. Flown with a 7mm nozzle. Angled quite a bit on take off and flew a long way down range.
3a Acceleron II 120 Foam added to each segment, but this had virtually no effect  as no foam was formed. Otherwise an excellent flight. Landed a bit hard on the base and bent it. 19.36 second flight.
3b J4 II 120 Very good flight, but the parachute is still deploying a little too early. Flowin with a 7mm nozzle, 1.25L of water and bubble bath mix.
3c OO 120 Good flight, with a good landing. 7mm nozzle used and 700ml of water and bubble bath mix.
4 J4 II 130 7mm nozzle used for this flight. A slow take off, but angled into the wind and the parachute deployed early. Good landing.
5 J4 II 130 Again a 7mm nozzle was fitted, and the takeoff was really slow, but again an early deploy.
6 J4 II 130 Nozzle switched to 9mm for a faster takeoff. Good flight but again angled into the wind. landing was good.

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