Abstract: Weight estimation of materials from their characteristic density has a great advantage on analyzing the basic weight parameter put at initial stage of the project. During the detail design stage, each component is designed with basic dimensions and material selection. The selected weight will be verified with other materials such as steel, aluminum and composites. The total weight of the Quadcopter when made of steel, aluminum and composites are compared with the reference value of parameter, total component weight and then the bets material will be recommended for the Quadcopter airframe. The composite materials are found to be light and strong when compared to steel and aluminum frames. If we use this material the Quadcopter will have more flight time for spraying.