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Micro-Trak AIO HA with Hanging J-pole - Link
Need two methods of “cutdown” (bringing the balloon down from altitude) to fulfill regulatory requirements by FAA
Bursting balloon counts as one, so you only need to design one method of cutdown (unless you launch an under-inflated or balloon using a non-conventional material)
Melting the rope connecting payload to balloon is a common one
Parachute release mechanism