Talk:Propulsive efficiency

This article is within the scope of the Aviation WikiProject. If you would like to participate, please visit the project page, where you can join the project and see lists of open tasks and task forces. To use this banner, please see the full instructions.AviationWikipedia:WikiProject AviationTemplate:WikiProject Aviationaviation articles

This article has not yet been checked against the criteria for B-class status:
Referencing and citation: not checked Coverage and accuracy: not checked Structure: not checked Grammar and style: not checked Supporting materials: not checked	To fill out this checklist, please add the following code to the template call: \| b1<!--Referencing and citation--> = <yes/no> \| b2<!--Coverage and accuracy --> = <yes/no> \| b3<!--Structure --> = <yes/no> \| b4<!--Grammar and style --> = <yes/no> \| b5<!--Supporting materials --> = <yes/no> assessing the article against each criterion.

Associated projects or task forces:
/
	This article is supported by the aircraft project.
	This article is supported by the aircraft engine task force.

Rocketry Mid‑importance

	Rocketry portal This article is within the scope of WikiProject Rocketry, a collaborative effort to improve the coverage of rocketry on Wikipedia. If you would like to participate, please visit the project page, where you can join the discussion and see a list of open tasks.RocketryWikipedia:WikiProject RocketryTemplate:WikiProject RocketryRocketry articles
Mid	This article has been rated as Mid-importance on the project's importance scale.

‹See TfM›

Physics: Fluid Dynamics Low‑importance

	Physics portal This article is within the scope of WikiProject Physics, a collaborative effort to improve the coverage of Physics on Wikipedia. If you would like to participate, please visit the project page, where you can join the discussion and see a list of open tasks.PhysicsWikipedia:WikiProject PhysicsTemplate:WikiProject Physicsphysics articles
Low	This article has been rated as Low-importance on the project's importance scale.
	This article is supported by Fluid Dynamics Taskforce.

Typical Propulsion Efficiency Values

Latest comment: 13 years ago1 comment1 person in discussion

Would be nice to see P.E. values for the type of engines mentioned, say, at normal cruise speed. Also, could P.E. figures for the Ion Engine be given as well? Thanks. Tony (talk) 17:28, 31 October 2011 (UTC)Reply

Oberth effect?

Latest comment: 9 years ago1 comment1 person in discussion

Is the Oberth effect about propulsive efficiency? I'm not sure that's the case. Maybe this should be discussed and straightened out. DonPMitchell (talk) 21:26, 26 September 2015 (UTC)Reply

Assessment comment

The comment(s) below were originally left at Talk:Propulsive efficiency/Comments, and are posted here for posterity. Following several discussions in past years, these subpages are now deprecated. The comments may be irrelevant or outdated; if so, please feel free to remove this section.

The introduction to this article is confusing. The the title is "Propulsive efficiency," but the first definition is given for "Overall Propulsive Efficiency" in terms of Propulsive efficiency. The definition of the title topic should come first.

Last edited at 20:28, 13 April 2008 (UTC). Substituted at 03:28, 30 April 2016 (UTC)

confusing mechanical and propulsive efficiencies

Latest comment: 4 years ago1 comment1 person in discussion

The article confuses between mechanical efficiency and propulsive efficiencies.

The propulsive efficiency (eta_p) is the ratio of useful power used to propel a vehicle to the available power in a jet. It is equal to (Thrust*VehicleVelocity)/JetKineticEnergy

The mechanical efficiency (eta_m) is defined as the useful mechanical power available at a shaft relative to the power input. It is defined for SHAFTS. It should not appear in this article except may be as an analogy of the propulsive efficiency for engines powering shafts.

This article is called propulsive efficiency, therefore it should focus on propulsive efficiency, not on overall efficiency and not on mechnical efficiency. Amgadoz (talk) 05:00, 14 June 2020 (UTC)Reply

Section on propulsive efficiency of propeller does not actually deal with propulsive efficiency

Latest comment: 2 years ago1 comment1 person in discussion

Propulsive efficiency is independent of mechanical efficiencies. It depends on nothing except the velocities and massflows entering and exiting the propulsor. The question which propulsive efficiency answers is "how much thrust do we achieve for a given amount of power applied to the air?" I'm out of time for today, but I am sure there is some good material on this available either from NASA, from Mark Drela, who usually writes very understandably, or in one of the standard books on aerospace engineering.

The information in the section on propellers is not useless, and I have no reason to believe it to be wrong, but I'm sure that it belongs in another place, since it does not deal with propulsive efficiency. — Preceding unsigned comment added by 2001:980:5F25:1:1692:C4FD:B0BA:71FA (talk) 20:16, 15 December 2021 (UTC)Reply

Add topic