effective thrust

effective thrust

[ə¦fek·tiv ′thrəst]
(aerospace engineering)
In a rocket motor or engine, the theoretical thrust less the effects of incomplete combustion and friction flow in the nozzle.
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Based on the total resistance, the amount of effective thrust required to be able to move the ship in accordance with the planned speed could be calculated as follows:
In the decades-long quest to develop reusable aircraft that can reach hypersonic speeds Mach 5 and above engineers have grappled with two intertwined, seemingly intractable challenges: The top speed of traditional jet-turbine engines maxes out at roughly Mach 2.5, while hypersonic engines such as scramjets cannot provide effective thrust at speeds much below Mach 3.5.
The Cherry Valley cock, although weakened by the cut, gave the Worcester bird several effective thrusts about the head.

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