Vertical vs Horizontal takeoff (VTO vs HTO)

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Discussion Overview

The discussion revolves around the comparison between vertical takeoff (VTO) and horizontal takeoff (HTO) in terms of energy efficiency and cost. Participants explore the mechanics and implications of each method, touching on aspects such as engine thrust and lift generation.

Discussion Character

  • Debate/contested

Main Points Raised

  • Some participants suggest that horizontal takeoff is more energy efficient than vertical takeoff, citing the role of wings in providing lift during HTO.
  • One participant notes that in vertical takeoff, the engine must generate enough thrust to overcome gravity entirely, while in horizontal takeoff, the engine primarily provides lateral motion.
  • Participants provide figures regarding the maximum take-off weight and thrust of a typical 747-400, indicating that the thrust produced by its engines may not be sufficient for VTO without a significant number of engines.
  • There is a mention of staging issues and the differences between rocket and propeller propulsion in the context of takeoff methods.

Areas of Agreement / Disagreement

Participants express differing views on the efficiency and feasibility of VTO versus HTO, with no consensus reached on which method is definitively better.

Contextual Notes

Limitations include assumptions about engine configurations and the specific conditions under which each takeoff method is evaluated. The discussion does not resolve the complexities involved in comparing the two methods.

DavidRatcliff
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Supposedly taking off horizontally costs less and is more energy efficient than vertical takeoff.

Aside from the issues of staging, and rocket vs. propeller, does anyone know why HTO is better than VTO?
 
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Welcome to PF, David.
In a vertical take-off, the engine has to supply all of the effort to fight gravity. When rolling, the wings provide the lift and the engine just has to provide lateral motion.
 
I just looked up some quick figures. A typical 747-400 has a maximum take-off weight of 875,000 lb; while the thrust it's engines produce is around 60,000 lb.

So you see...
 
minger said:
I just looked up some quick figures. A typical 747-400 has a maximum take-off weight of 875,000 lb; while the thrust it's engines produce is around 60,000 lb.

So you see...

per engine!
 
and unless that thing has a dozen engines mounted god knows where, it's not going to VTO.
 

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