Return to hot testing

Wow, it’s been a while since we’ve updated. We’ll do more updates as time permits, but for now some photos and videos…

We’ve been firing engines for about a month now, and working out various bugs in the system as they have showed up. We’ve verified two of the four engines and started giving Ian’s control algorithms a workout.

A photo from the first day of tests:

A still photo of engine Y+ at full throttle

A still photo of engine Y+ at full throttle

And now, the videos.

Fire number 3 on the first day of testing, a quick one:

Firings from last week of engine X-:

High speed video of engine X- firing last week:

Last, for fun, comparison between normal speed and high speed video. In normal speed it’s just a run of the mill start abort, because there was a loose connection on the device that lets the engine know if it is working or not. So it shut itself off automatically:

In high speed, though, it’s a ballet of concrete pavers and fireball:

The pavers are about $1 each and last for about a full minute of rocket fire before melting all the way though. They’re easy to replace and good enough for us to run whatever experiment is happening in any particular test.

They also make very nice molten concrete glass, which varies between black and green depending on the paver:

Glass of previously molten concrete on a rocket engine blast deflector.

Glass of previously molten concrete on a rocket engine blast deflector.