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joaquinwalkin
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What airspeed do I need to ignite a ramjet?
Ramjet Ignition Airspeed: What You Need to Know
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Discussion Overview
The discussion revolves around the airspeed required to ignite a ramjet, including both the vehicle's airspeed and the airspeed within the combustion chamber. Participants explore the efficiency of ramjets, weight considerations, and the metrics used to rate their performance.
Discussion Character
- Exploratory
- Debate/contested
- Technical explanation
Main Points Raised
- One participant inquires about the specific airspeed needed for ignition in a ramjet, both for the vehicle and the combustion chamber.
- Another participant suggests that determining the required velocity for ignition could be complex and potentially extensive to explain.
- A participant requests detailed information regarding the airspeeds for ignition at 60% efficiency, the vehicle's weight, acceleration time to maximum efficiency, and how ramjets are rated (specific impulse vs. pounds of thrust).
- There is a discussion about the reliability of Wikipedia as a source of information, with one participant expressing skepticism about its credibility.
- Another participant compares Wikipedia to Physics Forums, suggesting that both can contain inaccuracies due to anonymous contributions.
Areas of Agreement / Disagreement
Participants express differing views on the reliability of Wikipedia as a source, indicating a lack of consensus on this point. The technical questions regarding ramjet ignition and efficiency remain largely unresolved, with multiple inquiries and no definitive answers provided.
Contextual Notes
The discussion does not clarify the assumptions behind the efficiency metrics or the specific conditions under which the airspeeds are to be measured. There is also no resolution on the maximum efficiency of a state-of-the-art ramjet.