CosmicLog has an article up about the Rocket Racing League, that mentions (among other things) that Carmack’s Armadillo Aerospace will be supplying engines for the RRL, possibly as early as their first demo flights Aug. 1st and 2nd at the
Engine Failure Test
Armadillo did a cool test to see what happens to an engine if they let the tanks run all the way to dry. No explosion but definitely a destructive test.