Canon EOS 5D
ƒ/4.5
100 mm
1/5,000
500

I tried to break Mach1 yesterday and send this 8 lb. Giant Leap fiberglass rocket up 2 miles. But the nose cone popped prematurely during launch, so the rocket had sub-optimal aerodynamics, with an air scoop on top and a nose cone dragging by the Kevlar shock cord (visible at the horizon line at full size).

But a big enough motor can launch anything, and this crippled Firestorm54 went out of sight on an Aerotech K550.

I was using a pre-release motor controller, and perhaps it prematurely detonated one of the black powder chute charges. Imagine an M80 going off inside, which might overcome the force of acceleration…

I should be able to diagnose the problem when I download the flight log from the on-board computer. It has accelerometer and altimeter readings for the whole flight.

12 responses to “Air Scoop”

  1. It looks like it’s atop a fluffy tower of cotton wadding or clouds.

  2. nice. it’s backlit by the sun.

    I was stationed on the local hilltop (shooting into the sun with the long lens), and Tom was on the opposite hill, so we could get a good visual on where it came back down by parachute. A 400mm shot of the landing helped me find it later.

    We are still working on the post-mortem. Some strange sequence of events have me puzzled (e.g., the main charge detonated at 800 ft. as programed, so that makes it impossible for it to have detonated prematurely….)

  3. Indeed, the lighting on the smoke trail looks great. Good luck with the incident report!

    BTW, where was this? It looks like the greater Bay Area.

  4. YAY, non-fatal. Happy mystery hunting! You’re going to go from a K to an L? That might go to Mach 1 even with the nosecone off… Cool shot, pretty crispy looking morning. Livermore Labs doesn’t have any issues with 2 mile rocktets!? shocking. *grin* Livermore’s having a better time with security than Los Alamos, even so…

  5. Oh, we go farther East for the high power launches. Snow Ranch is a private cow farm East of Stockton, near the foothills to Yosemite. No targets for miles. =)

    On further thought, I think I’ll try the Firestorm on a K700 (which will probably be the limit for that one). I am looking for a larger rocket for the L motors….

  6. love the contrast. great story too.

  7. When is the San Mateo > Redmond Launch? Wanna get a good shot of that re-entry in my backyard. 😉

  8. Steve, please keep us posted on the status of the post mortem, as your public is eager for updates!

  9. fantastic!

    update: It looks like a wiring mistake to the new flight computer. It has three event connectors and jumpers for various configurations. With the settings I see, it triggered the main parachute charge upon launch detection (normally that trigger is used for motor cluster ignition so you can ignite secondary motors only if the main has lit). I am still trying to track down a USB adapter to be able to download the flight log.

  10. Hmm! So, it was just luck that you didn’t pop the main chute after all and rip it to shreds on the accent? Ooop! I’m glad it’s not just me that makes that class of oops.

  11. yeah… and that could have introduced a sudden change of trajectory at takeoff…. yikes!

    Luckily, against the thrust, the main chute was pushed back into the top tube.

    I am really glad this bird had two parachutes under seprate control. The drogue charge deployed at apogee, as intended. The sudden yank of the small chute was enough to get the main chute to slide out of the top tube. So both chutes were unfurled allowing for a soft landing.

    And, remarkably, someone else found the nose cone… with most of the paint missing.

  12. This is an awesome capture!
    The smoke trail is amazing!

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