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==Configuration==
==Configuration==
'''Balloon:''' Kaymont 1500g latex.
'''Mechanics:''' ValBal-style cylindrical polycarbonate sheeting, ValBal ballast and vent mechanism. Parachute in parachute tube. Total payload mass (without ballast, tether or floater) 1.07 kg.
'''Ballast:''' 1.5 kg.
'''Tether and floater:''' 30m paracord tether from balloon to payload and 30m paracord tether from balloon to floater. Total tether mass: 0.34kg. Hydrodynamic floater of mass 0.785 kg.
'''Avionics:''' BMP280, TinyGPS, Teensy 3.2 reporting all data at regular, fixed intervals via RockBlock modem. 2 solar-charged LED modules. Ballast motor controlled by N-type MOSFET.
'''Power:''' 18 L91 lithium AA batteries. In comparison with the standard ValBal complement of 12 L92 batteries, this was thought to be more than sufficient under the most optimistic conditions.
'''Mass budget:''' 3.42 kg. Counterweight was designed to balance 3.1 kg of total lift, after which ballast would be removed. In actuality, target fill resulted in nearly perfect buoyancy and no significant ballast was removed.
==Flight synopsis==
==Flight synopsis==