Bi copters are one of the rarely seen rotary wing vehicles in real world. Bi copters are difficult to manufacture and stabilise. Selection of proper materials and design for fabrication of a bi copter is crucial. This paper gives structural analysis of different materials using ANSYS as the software tool. Such an analysis can be done to any design model, here bi copter is under consideration. Carbon fibre and aluminium are taken as test materials for the purpose of analysis and structural analysis is done and the results are analysed and compared. It is found that carbon fibre has three times the load bearing capacity when compared to that of aluminium frame of a bi copter.