Table of forces involved

1.Forces that help propel the projectile/rocket

Composantes de propulsion de la fusée

1. Water jet thrust

Forces au dues à l'éjection d'eau

2. Compressed air jet thrust

Force dues à l'éjection d'air

3.'Specific Impulse' continuity during jet phase.

Note: Any factors that improve or influence specific impulse.

• Nozzle form and profile. 

• Stability of duct during expansion and acceleration phases.

• Dynamic fluid flow characteristics.

• Reduced turbulent fluid flow.

• Stable flight dynamics after decollage/launch.

• Expansion control of fluid flow both before and after leaving the nozzle.

• 'Tsiolkovski ' factor.

4. Elasticity of the plastic bottle.

Forces résultant de l'élasticité de la bouteille

2.Forces that resist the motion of the rocket/projectile

Composantes de résistance au mouvement de la fusée

4. Weight of the rocket M*g

Poids de la fusée

5. Aerodynamic resistance or Drag force

Résistance aérodynamique

Frottement.

6. Dynamic instability of rocket.

Instabilité dynamique de la fusée

7. Air turbulence or cross-wind that have components that oppose the trajectory of the rocket.

8. Meteo variables: Wind, rain, hail

 

Facteurs météorologiques: vent, pluie, grêle

9. Physical parameters of the environment (medium) in which the projectile flies.

Density, viscosity, kinematic viscosity, temperature, pressure etc.

 

Paramètres physique du milieu dans lequel se déplace la fusée:

Densité, viscosité statique et dynamique, température, pression etc…

10. Jet stream fluid dynamics.

11. Nozzle efficiency /Turbulent flow

                Convergent, divergent

Dynamique du courant fluide

Rendement de la tuyère

  Convergente ou divergente

Created by John Gwynn and Prof Jean LeBot.