DRDO lab develops retractable landing gear systems for unmanned aerial vehicles Tapas and SWiFT ANI | Updated: Jan 10, 2021 22:39 IST New Delhi [India], January 10 (ANI): The handing over ceremony of Retractable Landing Gear Systems (RLGS) for Tapas and SWiFT UAVs and 18 types of filters for P-75 Submarine took place on Sunday at Defence Research and Development Organisation (DRDO) laboratory, Combat Vehicles Research and Development Establishment (CVRDE), Chennai, according to the press release by the Ministry of Defence. CVRDE has indigenously designed and developed Three Ton Retractable Landing Gear (RLG) Systems for Tapas UAV. The design, development and testing of this gear system is carried out in co-ordination with Centre for Military Airworthiness & Certification (CEMILAC) and Directorate General of Aeronautical Quality Assurance (DGAQA) for certification.