In recent years, the understanding and development of unmanned aerial vehicles has grown exponentially. Although unmanned aerial vehicles have been designed and developed for performing military missions, currently the trend is to extend their applicability to civil missions such as fire fighting, critical infrastructure protection. Department of Science and Technology, Govt. of India initiated a research activity at IIT Kanpur to set up a laboratory for design and development of autonomous mini helicopter. The research activity was grouped under three categories namely mechanical systems, electronics systems and control algorithm and its implementation. This paper describes the newly added on board sensors like miniature radar altimeter, remote engine kill switch and their circuitry to integrate with the existing electronics and also explains the newly designed landing gear for mini helicopter to accommodate the space for payload. The flight data of mini helicopter when it is flown outside with the new onboard sensors, forward facing camera and modified landing gear is also presented in this paper.