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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

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#203 - Thunda 2

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#197 - Dark Shadow II

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#193 - Coming Soon

#192 - Stager Tests

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#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.
Click on an image to view a larger image, and click the browser's BACK button to return back to the page.


Day 118 - Polaron G2 flight and more
Filling with 4 liters of water.
Top section is screwed on.
Launched at 220psi.
(video frame grab)
Uses 16mm nozzle
(video frame grab)
Parachutes open past apogee.
Coming in nose first due to back up parachute shock cord wrapped around rocket.
Having faced high acceleration and landing the rocket now must deal with the eager recovery crew.
It's nice to get them back in one piece.
Always good to see new faces at the NSWRA launches.
Launch crew in action.
Axion IV launched at 125psi. Cameraman leaning too much.
27 seconds of air time.
This is what happens when you don't cover your equipment on the ground and launch a rocket with foam near it.
It's a tough job, but someone has to do it.
"Pod 2"
Getting Pod 2 ready to fly on a C6-5
Getting Paul's "Pod 3" ready....
... and launch....
Axion IV going for a second flight with foam.
Packing up at the end of the day.
Screw switch
(green PCB)

Date:  8th April 2012
Doonside, Australia
 25C, overcast light breeze
Team Members at Event:
PK, John K, Paul K and GK

It has only been a week since the last launch so we took the old Polaron G2 rocket for a spin. During the week I replaced the FC V1.6 in the nosecone with an STII timer as this is easier to operate during launch. The V1.6 used a separate remote-arm cord that needed to be pulled before launch and then used the G-switch to detect launch. With the STII we used the break wire option to detect launch and so there is no need for a separate arming action.
In the backup deploy mechanism, the power switch on the prototype STII was faulty and because I didn't have a spare one I decided to make one of those simple screw switches. They are very easy to make, lightweight, easy to mount, and will not accidentally turn off due to vibration or things moving past them.
Screw Switch
They are also available commercially here:
Mike recently made a really nice screw switch for his project:
I made ours from an off-cut from an old PCB, and simply soldered a nut to one side. I also put a thick layer of solder on the contact area so that when you tighten the screw it digs into the solder for a good contact.
We extended the G2b rocket by a spliced quad to get the original full length G2 rocket as we first flew it back in Jan 2011 with the inline deploy mechanism,
Because of the issues with the #16 camera we taped the older #11 to the side. I am still waiting for the higher class SD cards to see if that will fix the problem with the #16.

Flight Day

Setup was straight forward and again we filled up the lower half of the rocket on the pad first with 4 L of water and then screwed on the top section. Because the new spliced quad had not been pressure tested yet we decided to launch the rocket at a lower 220psi just to be on the safe side.
Timer delay was set for 8 seconds which was a little past apogee for this pressure, but at least it also gave the back up uMAD deployment a chance to fire. It's better that the rocket comes down under 2 parachutes than on 1. If we deploy the main too early and the rocket stays pointing up, the uMAD never triggers.
The rocket took off fast and again made a lot of noise as it powered up into the sky. You can never get tired of the higher pressure launches :). The rocket flew fairly straight, although it did roll a little bit. It pitched over nicely at apogee and deployed the backup parachute as designed, shortly followed by the main. As the main deployed it twisted the rocket body around and wrapped the back up parachute shock cord once around the body of the rocket. This had the effect of moving the back up parachute attachment point further down the rocket, and as a result the rocket came down with nose angled towards the ground rather than tail first. The rocket landed well though in the grass without any damage.
The altimeter recorded 726 feet (221m) which was considerably less than what the simulator had predicted.
I'm not sure why that was, but perhaps due to increased drag from the parachute door? I don't think there was a leak on the rocket, at least we couldn't hear one from where we were standing.
Because the rocket drifted too close to the trees again due to the wind direction, we decided not to launch the G2 again.
We launched the Axion IV rocket a couple of times using foam. It's always fun to watch the slow launches as the rocket accelerates. These were only pressurised to around 120psi.
Paul also decided to build himself a water rocket from the spare parts we bring along for each launch. Within 10 minutes he assembled himself "Pod 3" and launched it. He also managed to fly 3 of his pyro rockets on the day and get them all back, so he was a happy.
What about progress on Shadow 2? .... more on that in the next update. :)
The heavily overcast conditions made it really poor for filming and photography.

Here is a highlights video from the day:

Flight Details

Launch Details
Rocket   Flygon (Paul's Aspire)
Motor   D12-7
Altitude / Time   ? / ? seconds
Notes   Great straight flight with streamer deployed just past apogee. It went high.  
Rocket   Polaron G2
Pressure   220 psi
Nozzle   16mm
Water   4000mL
Flight Computer   ST II - 8 seconds, uMAD backup
Payload   HD cam #11, zLog, STII+uMAD
Altitude / Time   726' / 43.66 seconds
Notes   Good flight with parachute deployment after apogee. Backup deployed first and then main about 1 second later. Good landing.
Rocket   Pod 2
Motor   C6-5
Altitude / Time   ? / ? seconds
Notes   Good flight and good landing.
Rocket   Axion IV
Pressure   125 psi
Nozzle   9mm
Water   1500mL + foam
Flight Computer   ST II - 5 seconds
Payload   Jet foaming spacer
Altitude / Time   ? / 27.8 seconds
Notes   Good flight with slow takeoff and parachute deployment right at apogee. Good landing.
Rocket   Pod 3
Pressure   120 psi
Nozzle   9mm
Water   1000mL
Flight Computer   ST II - 3 seconds
Payload   None
Altitude / Time   ? / 14.8 seconds
Notes   Good flight with parachute deployment right at apogee. Good landing.
Rocket   Axion IV
Pressure   125 psi
Nozzle   9mm
Water   1500mL + foam
Flight Computer   ST II - 5 seconds
Payload   Jet foaming spacer
Altitude / Time   ? / 29.86 seconds
Notes   Good flight with slow takeoff and parachute deployment right at apogee. Good landing.
Rocket   Thunderbee Hero
Motor   A3-4
Altitude / Time   ? / ? seconds
Notes   Good flight and good landing.


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