Jet vs. Wheel Efficiency: Which is More Effective for Land-Based Vehicles?

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SUMMARY

The discussion concludes that applying power directly to the wheels of a land-based vehicle is significantly more efficient than using a jet of air for propulsion. The kinetic energy transfer to the Earth when using wheels is negligible, resulting in nearly 100% efficiency. In contrast, utilizing a jet exhaust initially yields 0% efficiency before the vehicle is in motion, as most of the thrust is directed into fast-moving gases rather than contributing to forward motion.

PREREQUISITES
  • Understanding of basic physics principles, particularly kinetic energy.
  • Familiarity with propulsion systems in vehicles.
  • Knowledge of energy transfer mechanisms.
  • Awareness of efficiency metrics in engineering applications.
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  • Research the principles of kinetic energy and its applications in vehicle dynamics.
  • Explore various propulsion systems, focusing on wheel-based versus jet-based mechanisms.
  • Study efficiency metrics and calculations in mechanical engineering.
  • Investigate real-world applications of turbine technology in land vehicles.
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Engineers, automotive designers, physics students, and anyone interested in vehicle efficiency and propulsion technologies.

SMD1990
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Let's suppose one wanted to move a wheeled, land-based vehicle. Generally, which would be more efficient, and why? Using a jet of air straight out the back (like the Batmobile seen in the 1989 Batman movie) or absorbing most of jet's thrust through a turbine and delivering that force to the wheels? So, pushing on air or pushing on a turbine connected to a wheel?
 
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Generally, applying the power to the wheels will be more efficient.
 
This would be because the Kinetic energy transferred to the Earth would be vanishingly small, when you use a wheel, (the Earth doesn't move backwards, measurably) whereas there is a lot of (much more) kinetic energy transferred to the very fast moving exhaust gases. So the efficiency for the wheels is nearly 100% and the efficiency for the jet would be, initially (before the car is actually moving) 0%.
 

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