Aerospace/Aviation/Jet Engines

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Question
Greetings.

I am currently building a small jet engine, and I am eager to know what the approximate ratio of fuel to oxygen is (to produce maximum thrust). I also would like to know where to engineer the center of gravity in a jet-powered plane? Any light you could shed on these issues would be a great help.

Thanks,

From Rimpo.

Answer
Hi Rimpo,

The approximate stochiometric air to fuel ratio is about 15/1 for hydrocarbon fuels...  I believe slightly richer ~12/1 yields the most power... but I don't have my propulsion info in front on me right now...

I'm not really a flight mechanics guy, but roughly speaking I don't think it matters whether it's a jet or not wrt stability and control (although I do know some jets are actually unstable on paper and are stabilized by sensors, actuators and high speed digital computers)...

Hope this helps some,
mj

Aerospace/Aviation

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Mark Janus

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I can answer questions regarding aerodynamics, fluid flow, and computational simulations.

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turbomachinery flow analysis, computational fluid dynamics

Organizations
Mississippi State University

AIAA

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AIAA SIAM

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Ph.D. in Aerospace Engineering

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