Many improvements were made including

• New fin design (mechanically much more robust)
• Electronics payload compartment accommodating, accelerometers, gyroscopes, magnetometer, barometric pressure sensor, 2MP camera, LiPo battery and charge controller, a servo and a WiFi enabled ESP8266 32bit Microcontroller acting as the on-board computer
• Spring loaded parachute, deployed at apogee using a servo (apogee is detected via the rockets attitude determined from magnetometer data)

The changed to the v2.0 model included

• New 30'' nylon parachute (the bin liner version didn't support the acting forces)
• Rubber band shock absorber in the parachute harness
• Adjustments to the parachute release point
• Improvements in the on-board software
• changes to the nozzle design as the epoxy didn't withstand the pressure
• rubber gaskets were added to the tornado couplings between the sections
• added another bottle section (new volume → see below)
• adjustment on the launchers nozzle latch to support the new nozzle design
• repairs of damages due to rough landings from previous flights
• higher pressure at launch up to 110 psi

Datasheet

• total volume: 4.73 l
• empty weight: 426 g
• parachute diameter: 760 mm
• nozzle diameter: 9 mm
• height: 1320 mm

The changes planned include

• increased nozzle diameter of 10 mm (drilled open)
• Improvements in the on-board software
• increased sensor data rate
• replace RGB camera which was read by the onboard computer directly with a standalone HD camera (including SD card - just activated by the onboard computer) which saves computational resources
• Launch tube