Strength Design of Rx 450 Rocket Fin Due To Effect of Aerodynamic Load

Abstract

The stability of the rocket is a very important parameter, therefore it is necessary to study the forces and moments that
occur on the rocket due to air flow on the rocket's body. The force and moment that occurs must be able to be held by the rocket,
especially by the fins without fail. The rocket fins are connected to the rocket body using a holder made of plates which are
reinforced with bolt joints. Loads that occur during the duration of the rocket flight in this part include: aerodynamic forces in the
form of lift and drag forces, as well as thrust which is the result of propellant combustion. This paper discusses the design of RX
450 rocket fin strength due to aerodynamic loads that occur. Analytical calculations are carried out to get an estimate of rocket
velocity based on the results of static tests, lift, drag and stress that occur on the rocket fins. The stress calculation results are then
analyzed based on the material properties of the rocket fins to get the conclusion that the rocket fin design is safe or not. From the
calculation results obtained bending stress that occurs in the design of the fin design using 6061 aluminum alloy material with a
thickness of 25 mm is �"#$ = 58.09 MPa, with a safety factor of (SF) = 4.75.