DSC-RX100M3
ƒ/4
8.8 mm
1/320
125

Our last flight before the winds picked up to a white-out on Saturday.

Our fiberglass and carbon fiber DroneDeploy rocket screamed to 13,000 ft. and Mach 1 over the Black Rock Desert at BALLS 27. For this flight, we logged the flight dynamics with an HCX flight computer, and used an RF-tracker to find it.

So this was the logo display before launch…. with Drone Deploy at the bottom. The rocket is based on a Giant Leap Rocketry Vertical Assault, but the upper half was destroyed in a prior flight that turned into a huge lawn dart (no parachute event), and I rebuilt it with an upper section of all carbon fiber.

The on-board video camera caught the whole flight, with a nice view over the playa, but the asymmetry on the airframe induced a bit of a spin on the ascent. Video

4 responses to “The Supersonic DroneDeploy Rocket”

  1. Prepping the flight computer in the avionics bay, and the build went to the next day (Thanks for these photos Peter Thoeny): Last minute adjustment – adding a shear pin to the apogee parachute bayLoading the launch railOn the pad, I arm the flight computer and listen for the beeps that signal all’s well and electrical continuity on the two fuses that are needed to deploy the parachutes (a small one at apogee and a main at 800 ft)Last step is to arm the motor igniter (only when everything else is armed and safe to fly… just in case)Blastoff of a clean-burning thermoplastic propellant from Cesaroni Aerospace in Canada. It leaves very little smoke and burns for a long time (with an offset slot grain on one side vs. the usual central cylinder burning outward from the core:

  2. Do the supersonic rockets make a noticeable "crack" or "boom" as they break the sound barrier? Or is it all kind of wrapped up in the overall sound of the rocket scream?

  3. My theory on the lack of an audible sonic boom: the cross-sectional area of a 3"-diameter rocket is very small and the shock wave cone is 90°-shifted compared to a jet overhead. So it would be a faint boom, and heard best at a location that is very different from the flight line. Also, it happens when under thrust, and the launch viewer has the engine pretty much directly overhead pointing back at us when the boom would occur.

  4. Want to hear the shock? Think its getting time to build that Q and break 100K. Until then, meet you on the moon!!

Leave a Reply to jurvetson Cancel reply

Your email address will not be published. Required fields are marked *