m dv/dt = F ā mg ā Ā½Ļ Cį“
A v|v|m: kg; F and mg: N ; v: m/s, positive ascension.
Use when: Vertical writing: the term v|v| adapts the sign of the drag to the direction of movement.
Rocket assembly and flight principles
Link systems integration, thrust, mass and vertical trajectory.
What is happening?
The motor accelerates a backward flow of material; the reaction produces a thrust on the vehicle. The structure, tanks, avionics and payload must be integrated before launch.
During powered flight, mass decreases. Weight and drag oppose ascent; after extinguishing, the vehicle can continue to climb before the climax. The workshop model remains vertical and suborbital.
The formulas, with their conditions.
D = Ā½ Ļ Cį“
A vĀ²Ļ: kg/mĀ³; Cį“ : without unit; A: mĀ²; D: N.
Use when: Drag magnitude; the workshop model uses constant Cį“ .
ĪvidĆ©ale = Isp gā ln(mā/mf)Isp: s; gā: m/sĀ²; mā and mf: initial and final masses.
Use when: Ideal Tsiolkovsky equation, without gravitational or aerodynamic losses.
Where is this principle used?
Launcher Integration Center
Assemble and verify functional interfaces.
Space industry and propulsion research
Study mass balances, forces and telemetry.
What to observe in the experiment
Observe the continuation of the ascent after extinction. Explain why the apogee does not necessarily coincide with the end of the surge.
References and readings
This sheet explains the principles and their assumptions. Educational simulation can simplify the process; an industrial model requires suitable data and validation.
Have you understood the essentials?
Only one correct answer per question. Answer all three questions, then view the answer key.
Intu Lab Ā· Understanding sheet Ā· Kimba Christian