Ultralight Aircraft problem?

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want build ultralight aircraft out of 4 fans , other parts. plan have fans push air downward , push aircraft up. know have counter rotate or whatever technical term is. project weigh under 254 pounds empty, , additional 140 pounds pilot. need know equations or if equation see how big of propeller on each fan need , thrust of each fan. have no idea start looking information either, , if point me book or something. have planed out, need equations this. ty in advance.

i want build ultralight aircraft out of 4 fans , other parts. plan have fans push air downward , push aircraft up. know have counter rotate or whatever technical term is. project weigh under 254 pounds empty, , additional 140 pounds pilot. i...


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