Canon EOS 5D Mark II
ƒ/10
100 mm
1/5,000
1000

My carbon fiber rocket with onboard GPS transmission screams to Mach 2 on a CTI N2850 motor, reaching 33K ft. (final details to follow when I get the flight data from the two G-Wiz avionics computers and the flight data from the ground station).

That’s a 10 ft. tall plume coming out of the tail. The motor has an accelerated burn from o-ring spacers between each of the six propellant grains.

It was a perfect flight, with computer deployed airframe separation at apogee, and main parachute deployment at 1000 ft. The GPS readings show us hitting high winds aloft as we drifted back down through 20K ft., which took the rocket horizontally at 55 MPH. But that luckily brought it back closer to the flight line for an easy recovery.

Here’s the launch video compilation.

The only damage was to the vinyl stickers, which melted off.

13 responses to “Our Mach 2 Roar”

  1. GPS? Is the vertical accuracy good enough to track something moving at Mach 2?
    We use alot of GPS gear at work (surveying) and we struggle with vertical accuracy when using an uncorrected signal.
    I guess as your receiver moves higher, it would get better signals from satellites lower on the horizon.
    Or maybe I am overly worried about relatively minor issues?

  2. ‘Gratulations! Verrrry smooth!

    It looks to me not quite vertical – was this a deliberate part of flight design (e.g. going a tad up wind so that it would blow back toward launch point for easy recovery) or just the price you pay for for a portable launch rig parked on the playa? Methinks being off-kilter for 33K vertical feet could result in a long trek for recovery if it worked out wrong.

  3. Congratulations! Can’t wait to see the onboard video.

  4. Chute deployment at 800 feet? Is this 800 feet descent from apogee? I’m curious about the vertical accuracy as well. Also, what is the frequency of your GPS readings?

    How extensive and time consuming is damage inspection of the rocket after a launch?

    Very cool.

  5. depends on how much remains…. =)

    ► Shattered  ♫ ♪

    800 ft. from the ground. It has a barometric sensor for that. Redundant computers, sensors, and e-matches trigger that event. It is a nail-bilting moment as it it tumbling back at about 120MPH, with a wicked tail spin. (Given that and the color combo, we called her the "Dizzy Bee"). Correction: the HCX was programmed to fire at 1000 ft., not 800.

    jitze: good deduction. At BALLS, the decent rails are privately owned and coveted. The "public rails" were a challenge… I would have wanted to launch perfectly vertical, and would have flown higher…. Next time… =)

    Broken Toy Shop: I can’t wait to see the data feed from the GPS. We have the on-board computers to cross-correlate (with baro sensors, and integrated flight curves from the accelerometers). Earlier supersonic GPS discussion here

  6. I updated the video to include the recovery footage.

    Supersonic !!
    Supersonic !

    Pitch-Yaw-Roll
    Pitch-Yaw-Roll

    It was strong enough to survive unharmed… Tricky winds aloft…

  7. Must have been something in the air this weekend (Harvest Moon?) that caused much amateur launch activity around the world. Here is a brief movie of an amateur launch of a different type that occured on a North Sea playa within hours of the one above. (Ooievaar=Stork)
    @roel1943

  8. The spiraling trail is awesome!

  9. Stunning fast….thought the fins popped off….just the stickers?

  10. I thought the same thing at the moment. Tom, my rocket mentor, knew better. You’ll hear him talking about Pitch-Yaw-Roll coupling, a dynamic stability topic he gave me a primer on today. If you click on the corkscrew photo above, you can see a summary.

    Just realized that my propellant choice was Blue @ BALLS

  11. It was a nice launch! Amazing to see the stickers melted off!!

    I managed to get 600fps footage of the launch, check it out here:
    http://www.flickr.com/photos/natronics/5037581574/

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