Launch recordings of two three-stage model rockets at High Power Model Rocket Meet and Ra-05 Competition at SVOJEK 2021 on June 5 in Czech Republic. Semi scale model rocket DELTA IV HEAVY - PARKER SOLAR PROBE, total impulse 200 Ns and model rocket ROSON, total impulse 320 Ns. Air-start of 2nd stage and 3rd stage rocket motors. On-board camera recordings. Boosters jettison and parachute landing.