Rocket Propulsion Homework: Calculating Mass Loss R

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SUMMARY

The discussion focuses on calculating the mass loss rate (R) for a Roadrunner F45 rocket engine during burnout, given a mass of 93g for the engine and 30g of propellant burned. The formula used is R = Ma/Vrel, where Ma represents average thrust, which can be derived from the thrust curve graph. The challenge lies in determining Vrel, which is necessary for calculating R. Participants express difficulty in finding R without first calculating Vrel.

PREREQUISITES
  • Understanding of rocket propulsion principles
  • Familiarity with thrust curves and impulse calculations
  • Knowledge of mass flow rate equations
  • Basic physics of motion and forces
NEXT STEPS
  • Study thrust curve analysis for rocket engines
  • Learn how to calculate relative velocity (Vrel) in rocket propulsion
  • Explore impulse-momentum theorem applications in rocket dynamics
  • Review mass flow rate calculations in fluid dynamics
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Aerospace engineering students, rocket propulsion enthusiasts, and anyone involved in calculating performance metrics for rocket engines.

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Homework Statement



A Roadrunner F45 rocket engine, of mass 93g, is attached to a 2kg cylinder, which glides along a horizontal low friction nylon fishing wire. The thrust curve for the rocket engine is given.

In reality, 30g of propellant are burned as the engine is ignited. Calculate the average of mass loss R during burnout, in kg/s


Homework Equations



R= Ma/Vrel

The Attempt at a Solution



I guess Ma is the average thrust which I could calculate by using the graph. However, I don't know how to calculate V rel ( which is actually the next part of the problem). Is there any way I can calculate R other than use the normal formula ??

I have also calculated the impulse for the rocket.
 
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Anyone found out about anything yet ??

I have been trying but still cannot find R without calculating Vrel
 

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