Well, I'm going to attempt my first DD at our next club launch. The rocket I plan to use is either an upscale Nike Ram I am currently building (based on a Semroc thick walled, 225 tube) or a 2.2" diam. LOC Black Brant X. Both rockets have 29mm mounts, so an H motor should really make them scoot. The altimeter being used is a Missile Works RRC2 mini. I'm trying to keep everything simple for my first attempt. Question 1: Do the HotWire ejection canisters available at Newtons 3rd work well with the RRC2? If so, will one 9V battery fire them off? Question 2: Since these are both relatively small rockets for H or I motors, could breaking mach be a problem? I know the altimeter needs to be set differently if breaking mach - but how do I know if it will indeed break mach or not? Question 3: Could anyone post some pictures of their wired altimeter set up - especially a smaller one like I am trying to put together? A picture is worth a thousand words. Thanks!