Hi, 1st time poster, occasional lurker. Looking for advice & recommendations for building a 38mm powered dual deployment rocket with my son. We have figured out: * 38mm - gives options for running G through to J * Dual deployment - drogue or streamer & main - we are sick of long recovery walks... * Electronics - Dual StratoLoggerCF Altimeter or similar * 3" frame Our intention is to build something that is: 1) Cost effective to fly (G) 2) Initial Goal - Able to achieve L1 certification (H & I class) 3) Secondary Goal - Able to achieve L2 certification (J+) Our current thought is the MPR 38 - 3" but open to suggestions. Being in New Zealand, we have a limited supply of motors/reloads available - a 38/720 RMS case would give us ability to do a J launch, but case would extend in to lower bay by about 3cm - would this have any negative impact ? Would using a single use J class motor be better for L2 cert, which would also protrude in to the bay ? or should we initially limit ourselves to a 38/600 case and by using a 38mm reload adapter system, load it up with smaller charges for initial G, H or I launches ? Thanks in advance. Spig.