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

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Servo Timer II




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

Day 101 - Foam flights
Axion VII has a 7.5L capacity.
First flight launched at 125psi and 9mm nozzle.
A panorama made from in-flight video shortly after takeoff.
Cruising past the moon.
Downloading video between flights.
Caleb helping to launch a the rocket on the second flight.
Tracking the rocket with the DV camera.
Grass landings are always good to cushion the rocket landings.
Looking up through the launcher ring brace.
Flight #3 used the same configuration as the first two flights. About 1.8L of water with bubble bath.
Panorama of the launch site. You can see the launch pad and crew in the bottom center.
Basecamp near the pyro rocket launch area.
Clear blue skies are always nice.
Another panorama taken on the fourth flight, about 6 seconds before impact.
Rocket landed in tall grass, but 3 out of 4 bottles were buckled.
Extracting the video camera.
Nosecone was damaged, but all the important components survived without damage.
Just a few kinks.
Maybe no one will notice .... though the rocket squeaks a lot more now.
The likely cause of the Polaron G2 leak on the pad. A cracked seal on the launcher.
Servo Timer II is about half the size of V1.6. Here component clearances are being checked on a printout.
New side deploy nosecone under construction along side a repaired in-line deployment nosecone for G2.

Date:  26th February 2011
Doonside, NSW, Australia
26 Degrees C, light winds partly cloudy.
Team Members at Event:
PK and GK

Today was just a casual flying day as we don't have all the changes complete for the Polaron G2 rocket. We've had our time divided between a number of projects over the last couple of weeks (some non-water rockets) and so the G2 has been slower going. The nosecone and base has been repaired and repainted, and it just needs to be refitted with the servo and ejector plate.

We are also making a side deploy mechanism for the next G2 flight. The body of the mechanism is made from one of the bottles that was damaged during the last flight.

We have also started working on the back up parachute mechanism and all the electronics to go with it. It is a bit of a tight squeeze In the backup payload bay with the uMAD hooked up to our FC for deployment, the servo, battery, ejection plate, parachute and for gathering flight performance data we are also flying Craig's flight computer and the Z-log altimeter.

When we pulled apart the launcher, we found the main seal for the 15mm release head was split in a couple of places. This was likely the cause of the leak we had when we were pressurising the G2 on the pad. 

Flight Day Report

It was very good flying weather this weekend with mild temperatures and only a slight breeze. The rocket was only assembled the night before from spare components. We have a set of nosecones with deployment mechanisms, fairings, fin cans and spliced bottles in our inventory so it is just a matter of assembling them to make the rocket.

We were set up by about 9:30am and launched the 7.5L Axion. The flight was flawless with parachute opening right at apogee and landing very close to the pad. Because there was a slight breeze towards the "Christmas trees" (tall trees with several rockets hanging off them like decorations) we swapped to a smaller parachute for less drift and angled the rocket away from the trees. With the second flight also at 125psi, the rocket again left a nice foam trail almost all the way up to apogee.

The landing was good though the parachute was attached a little too far down the rocket, and the nose banged the ground. With a minor dent to the top bottle we set it up again for the third flight. We used 1.8L of water and foam mix in all the flights.

The third flight was a little less ideal with the parachute deploying late perhaps 2 or 3 seconds past apogee. We were flying the MD80 clone camera on all the flights hoping to get some shots of how the area is changing. In the footage from one flight you can see a rocket hanging in the Christmas trees.

The rocket was set up again for the final flight of the day. Everything was identical to the previous 3 flights, but this time the parachute never deployed and the rocket landed hard. Surprisingly, none of the electronics were damaged, and we only really need to replace 3 bottles and the nosecone deployment structure. I suspect that the parachute was caught under the ejection plate as there was a small gap under it. It was designed for a larger parachute. When packing the chute I thought that it didn't look like it sat too well in the parachute bay. The servo had activated as we found it in the deployed position. The servo also survived. Despite the hard crash it's actually a low cost repair job. At this stage we aren't going to do any repairs as we have spare bottles and nosecones ready for more casual flights.

Altogether it was a good launch day and we have good onboard video from all 4 flights. Thanks to Dan and Caleb for helping us launch the rockets.

Highlights video from the launch day


  • We spent about 5 days last week shooting the splicing video and putting the splicing tutorial together. I'm glad YouTube now allows 15 minute videos so we could do it all in one part. I think we used at least 30 different 2L bottles for the shoot as we had them prepared in different stages of construction to make the video shooting go faster, and most of the shots were done with two takes. But it's not a complete loss of 30 bottles, as we now have a number of new spliced pairs we can use on our rockets!
  • Servo Timer II - I've been continuing work on the servo timer this week. The design is finished, and all the firmware is complete, the components have arrived and I've finished the board layout as well. I've sent the layout off to get the prototype boards made so I'll be able to start assembling and testing soon. We want to do quite a few flights in different configurations first before we get more boards made.  A big thank you to PK from Whooshtronics for all the help.
  • More photos of pyro rockets and some videos from the Doonside launch day are here:

Flight Details

Launch Details
Rocket   Axion VII
Pressure   125psi
Nozzle   9mm
Water   1.8L
Flight Computer   V1.6 - 5 seconds
Payload   MD80 clone camera
Altitude / Time    ? / 34.4 seconds
Notes   Good vertical flight with parachute deployed at apogee. Larger orange parachute was used. Landed near the pad.
Rocket   Axion VII
Pressure   125psi
Nozzle   9mm
Water   1.8L
Flight Computer   V1.6 - 5 seconds
Payload   MD80 clone camera
Altitude / Time    ? / 22.54 seconds
Notes   Good flight, with smaller parachute deploying at apogee. Good landing.
Rocket   Axion VII
Pressure   125psi
Nozzle   9mm
Water   1.8L
Flight Computer   V1.6 - 5 seconds
Payload   MD80 clone camera
Altitude / Time    ? / 23.6 seconds
Notes   Good flight, angled away from trees. Small parachute deployed late. Good landing.
Rocket   Axion VII
Pressure   125psi
Nozzle   9mm
Water   1.8L
Flight Computer   V1.6 - 5 seconds
Payload   MD80 clone camera
Altitude / Time    ? / 12.5 seconds
Notes   Good flight, with good onboard video. Parachute failed to deploy and rocket crashed. All electronics survived. 3 damaged bottles and nosecone structure.


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