_Nice!_ I built a similar size rocket (4.5 feet long, 2" body OD) recently which I haven't flown yet that is also running a J270, I'm looking forward to the launch after seeing this fly, that was fast as hell. I built the J270 myself, it will be my first homebrew APCP motor launch and I'm hoping it doesn't Cato on the pad lol. Not that I'm all that concerned about a Cato, I built it from scraps and only spent $40 max on everything😅, it's just a $22 RCS motor kit + my HTPB-based APCP fuel grains, a clear polycarbonate tube, 1/8" plastic sheets cut into fins bonded with epoxy fillets, some Visqueen plastic for a chute and nylon packing straps to hold it all together, plus a chunk of steel BBs epoxied into a ball in the nosecone as counterbalance, it's nothing fancy so if it _does_ Cato I'm not out a wad of cash lol, I'm not that confident in my motor manufacturing skills to put expensive hardware and dozens of hours of work into it yet haha. HPR is -expensive- fun!

rocket and flight looked great! awesome job!