How much power? What are the limits on weight? What do you have available for tools (lathe? Drill press? spot welder?) and materials (stainless steel tubing?)? What do you consider low cost-free? $10? $1000?
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The very cheapest option involves a hammer and nail.
https://www.instructables.com/tag/?sort=none&limit%3Atype%3Aid=on&q=jet+engineLook there first?