The focus of this project is on the preliminary design of an unmanned aerial
vehicle (UAV) utilizing a coaxial rotor setup, taking into account its flight
dynamics. Additionally, a comprehensive aerodynamic analysis is conducted using
computational fluid dynamics (CFD). The idealogy for our design came from the
Rukma Vimana, a flying craft mentioned in the ancient Hindu Scriptures. The
design is optimized with the coaxial copter setup, a different approach that has
yet to be widely explored in the UAV aspect. Coaxial rotors are installed in
pairs, with one rotor mounted above the other on concentric shafts. Both rotors
have the same axis of rotation, but they rotate in opposite directions
(contra-rotate). CFD simulations are conducted to see how the fluid medium flows
over the unconventional design of the UAV. Three different in terms of three
designs heights are considered, ie, a 30 cm height model, a 35 cm height model,
and a 40 cm height model. The inclination of the analysis done is parallel to
gravity; therefore, we have tested for vertical flow since it is a vertical
take-off and landing (VTOL) configuration. Variations in the nose cones are also
carried, such as the blunt nose cone and the round nose cone. Overall, with
three different heights and two variations in the nose cone, we had a total of
six simulations to analyze in CFD from which 30cm performed better out of which
we chose the blunt nose cone with a height of 30cm is assumed to be the best
configuration as it was feasible to fabricate.