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Each flight log entry usually represents a launch or test day, and describes the events that took place.
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Day 134 - 7 Years, Inverter Flights, Axion G4

Date: 9th June 2013
Doonside, NSW, Australia
 Sunny, very light winds < 5km/h early, 20C
Team Members at Event:
 GK, PK, Paul K, and John K.

7 Years

This week we celebrated 7 years since our very first launch in the backyard. Water rockets continues to be a fun journey and a rewarding hobby. It's also been great watching the boys grow up and become more and more helpful during launches and with rocket preparation. We have compiled a video from the last 7 years of things that haven't gone exactly to plan:

Here is a collection of photos of how the rockets and boys have grown over the years.

2006 2007 2008 2009 2010 2011 2012 2013

Day 2

Day 9

Day 9

Day 15

Day 16

Day 18

Day 20

Day 25

Day 29

Day 30

Day 33

Day 44

Day 52

Day 56

Day 57

Day 61

Day 65

Day 66

Day 71

Day 76

Day 76

Day 77


Day 83

Day 83

Day 88

Day 92

Day 92

Day 94

Day 94

Day 98


Day 103

Day 104

Day 105

Day 111

Day 113



Day 117

Day 118

Day 118

Day 120

Day 121


Day 129

Day 130

Day 131

Day 132

Day 133

Launch Day

We finally got back to launching again after a short break. On Sunday it was a beautiful morning for launching rockets at Doonside. The skies were clear with only a very light breeze. We took the Inverter out for another spin to try to get some video looking straight down. From the last flights we noticed that the rocket was very stable as it descended so we put one downward facing camera on the rocket and one sideways. Under parachute they would swap roles and look sideways and downward respectively.

The rocket was launched at 120psi and again with a nice slow take off it flew a nice arc right over the car park and the parachute opened past apogee but in plenty of time. The rocket reached an altitude of 407 feet. The view from both cameras was good although the MD80 clone looked like it is out of focus. We haven't used this camera for a long time and I recall that the last launch we used it on, it was also out of focus. It may be that is how it came from the factory. I did notice though in the video that close up things were nicely in focus. This may not be too bad actually as we will use the camera in another experiment we have planned. Paul did a great job of photographing the rocket during launch as shown below.

We set the rocket up again for a second launch with an identical set-up. The rocket flew to 384 feet and landed at almost the same place. Again good video was obtained from the on-board cameras.

For the next launch we prepared a flight of the Axion G4 rocket with foam, although we didn't use a jet foaming configuration. The rocket was built from 2 spliced pairs and a spliced quad reinforced with fiberglass. Launched at 200psi you could visibly tell that it had much more power than our regular launches. The rocket went straight up but spun quite a bit. It reached an altitude of 673 feet ( 205 m ) which wasn't too bad for only 200psi. We also had a camera attached to the side to look down. On the way down the parachute tangled a little but fully opened a couple of seconds later so it came down without a problem.


By the time we set the rocket up for a second flight the wind had picked up and blew directly towards the rocket eating trees. We decided not to launch and walk away with the rocket rather than have it get stuck in the tree. Paul had also launched 3 of his pyro rockets throughout the day. The near vertical 2 stage flight was particularly good.

We also used the LaRF again to find one of the club member's pyro rockets that landed ~1380 feet (420m) from the pad. The attenuated laser was still very easy to see from that distance and the beam spread looked like it was around 10cm.

Here is a highlights video of the day:


Flight Details

Launch Details
Rocket   Inverter
Pressure   120psi
Nozzle   16mm
Water   6500mL
Flight Computer   ST II - 6 seconds
Payload   HD Cam #16, MD80 clone, AltimeterOne
Altitude / Time   407 feet (124 m) / 37.2 seconds
Notes   Slow boost but accelerated well. Parachute was released well after apogee. Good gentle landing. Good on board video and altimeter data.
Rocket   Inverter
Pressure   120psi
Nozzle   16mm
Water   6300mL
Flight Computer   ST II - 6 seconds
Payload   HD Cam #16, MD80 clone, AltimeterOne
Altitude / Time   384 feet (117m) / 40.7 seconds
Notes   Flight almost identical to the first one. Good on board video and landed almost in the same spot.
Rocket   Pod 2 (Paul's Praetor)
Motor   C6-0, C6-5
Altitude / Time   ? / ?
Notes   Good burn and went straight up. The second stage lit well and continued vertically. Good deployment and good landing.
Rocket   Axion G4
Pressure   200psi
Nozzle   9mm
Water   1700mL
Flight Computer   ST II - 5 seconds
Payload   HD Cam #11
Altitude / Time   673 feet (205m) / 34.8 seconds
Notes   Good Launch. Rocket flew nice and straight but rolled. Good deployment but parachute tangled. Parachute finally opened late and good landing.
Rocket   Buzzard
Motor   A8-3
Payload   None
Altitude / Time   ? / ? seconds
Notes   Good straight flight, with deployment right near apogee. Good landing..
Rocket   Pod 2 (Paul's Praetor)
Motor   C6-5
Altitude / Time   ? / ?
Notes   Good burn and good vertical flight. Good landing right near the pad,



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