Fifty-one BP motors sure make an impressive column of fire, as seen in this photo of Boris Katan's Hell Boy 70. There are more photos on his TRF post. He reports that it hit 1,250' and both parts recovered well. In fact, the 'single use' booster is partially reusable. One of the 19 sustainer motors didn't fire but at least in my book this was totally successful. So cool!