I flew t' unmodified version o' this rocket for me Level 1 on an AT H128W - great reload and great flight!  For me Level 2, I added a LOC 4" avionics bay and extended payload section.  I used a PerfectFlite MAWD with Newton's Third canisters for drogue and main deployment charges.  I used three 2-56 nylon screws for shear pins on t' nose cone.  T' Horizon is one awesome rocket!

July 2011 update - I mounted a custom built GPS telemetry system in t' Orzel.  T' rocket avionics portion consists o' a GPS module, an Xbee wireless radio, and a 3.7v LiPo battery pack.  T' ground station consists o' another Xbee wireless radio, an Arduino Fio, an LCD, and a 3.7v LiPo battery pack mounted in a plastic enclosure.  Ground testin' o' t' system has been completed and position data has been successfully validated with a handheld GPS.  I plan t' perform flight testin' at t' next Battle Park launch this fall.