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I've revised the design of the fuel injection to fit these new changes, as is illustrated below. v8-inj.PNG The shape of the actual spray nozzle depends on whether I use kerosene or a propane-butane mix, which in turn depends on the heat and thrust generated by the fuel. Flame temperature is importa...

Quick update: according to the resource on ramjets, the length of the combustion chamber should be about 3 times the diameter of the inlet. From its area I calculated the inlet's effective diameter (the diameter of a circle with the same area) and set the combustion chamber's length to be 3 times th...

Aside from what you can see in the attached image, I have also altered the flameholder by slightly increasing the width of each gutter and increasing the length to equal the width. The angle of each gutter is now 45 degrees. The cooling duct, doubling as a means by which to attach the engine to a py...

Hi, thanks for your interest! As for your questions, I can tell you that: The area of the inlet is 19.6 cm^2 and the area of the nozzle is 28.9 cm^2 I'm a little unsure as to what you mean here, but the total area taken up by the gutters (including the empty space behind them) is about 6.9 cm^3- eac...

Also, I should point out that I'm planning to use 1mm thick mild steel for construction, the engine is about 10cm tall and 62cm long. I've known the material to be very stiff when cut into dimensions like this, even more so when welded to other parts. Do you think this would mitigate the issue of dr...

I should mention that there are some minor changes I have made which aren't shown in the recent diagrams- the flameholder gutters are now, from a top-down plan view, 1cm*1cm and have an angle of 90 degrees. Does this seem alright to you?

Thanks for the tip on that. What do you think I should change about the shape of the engine duct itself?

What else would you suggest I change?

This is the latest iteration of the design.

Here is a cut-away diagrammatic view of the engine's latest iteration, with the fuel injection, flame holder, spark plug and cooling duct visible.

Hi! For the past few months, I've been developing a low-speed ramjet engine design. The design itself is mostly original- it isn't by any means a typical "coffee mug" style engine, as you can see in the image below. RJ2-Views.png Now, before you tell me I've got scramjets on the brain, let me explai...