A hover test of the Armadillo Aerospace Supermod rocket, shot in fantastic 3D. The test was on June 4 2011 at the Armadillo shop in Caddo Mills, TX.
Why is the engine pulsing? It's a very large engine for the weight of the vehicle, and it doesn't really want to throttle that low. In actual flight it will be flying all-out, and we don't want to re-write the code to make it hover nicer. It does show how quickly an engine like this can be throttled without special effort.