Talk:Reaction engine

The printable version is no longer supported and may have rendering errors. Please update your browser bookmarks and please use the default browser print function instead.

This is the talk page for discussing improvements to the Reaction engine article.
This is not a forum for general discussion of the article's subject.

Put new text under old text. Click here to start a new topic.
New to Wikipedia? Welcome! Learn to edit; get help.

Article policies

Find sources: Google (books · news · scholar · free images · WP refs) · FENS · JSTOR · TWL

Physics Mid‑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
Mid	This article has been rated as Mid-importance on the project's importance scale.

Aviation: Engines

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

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.

This article is supported by the aircraft engine task force.

Spaceflight High‑importance

	Spaceflight portal This article is within the scope of WikiProject Spaceflight, a collaborative effort to improve the coverage of spaceflight 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.SpaceflightWikipedia:WikiProject SpaceflightTemplate:WikiProject Spaceflightspaceflight
High	This article has been rated as High-importance on the project's importance scale.

Rocketry High‑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
High	This article has been rated as High-importance on the project's importance scale.

Transport High‑importance

	Transport portal This article is within the scope of WikiProject Transport, a collaborative effort to improve the coverage of articles related to Transport 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.TransportWikipedia:WikiProject TransportTemplate:WikiProject TransportTransport
High	This article has been rated as High-importance on the project's importance scale.

Pump-jets

Would it be correct to add water pump-jets as examples of reaction engines? The Jet-ski (and equivalent) uses a pump-jet for propulsion, i.e. it obtains thrust in reaction to the ejected stream of water. But then this is really so different from a propeller on a shaft external to the engine? (Sdsds - Talk) 18:58, 26 May 2007 (UTC)[reply]

dE/dt is not F v

In a discussion on the Talk:Conservation of energy page, I made the point that the time rate of change of the kinetic energy of the rocket engine is not simply Fv where F is the thrust and v is the engine velocity. A second term which constitutes an energy loss due to the mass of propellant being lost to the exhaust must be included. The correct statement is:

$dE/dt=Fv-{\frac {1}{2}}\mu v^{2}$

where $\mu$ is the rate at which propellant mass is converted to exhaust mass. As noted by 95.134.115.203, the total power P and thrust F produced by the engine can be assumed constant, so, assuming no heating effects, if Po=Fv is the rate at which the engine increases its kinetic energy, and Px is the rate of energy increase of the exhaust train, then P=Fv+Px or Px=P-Fv and at a high enough velocity, the rate of change of energy of the exhaust train is negative. Thats impossible.

I would edit the article myself, but I am not familiar enough with it to trace the implications of this throughout the article. PAR (talk) 21:53, 9 April 2010 (UTC)[reply]

What is I_sp ?

It is introduced in paragraph 3 without any explanation. Nor is there any mention of I_sp in the referred article "Propulsive_efficiency". Mesdale (talk) 11:03, 19 August 2015 (UTC)[reply]

Merge content from Spacecraft_propulsion#Reaction_engines

The Spacecraft_propulsion article has a large (too large) section on reaction engines. I would like to see the bulk of that content moved here to this article with only a short summary left on that page. Any input like warnings or encouragement would be appreciated. Somebody doing it would also be VERY appreciated. If not, I'll give it a try, but I have a lot of propulsion studying to do before I could pull it off. Thanks. JaredHWood💬 22:47, 3 February 2021 (UTC)[reply]

Pump-jets

dE/dt is not F v

What is Isp ?

Merge content from Spacecraft_propulsion#Reaction_engines

What is I_sp ?