* To meet USA's FAA FAR Part 103, an "ultralight vehicle powered" must not weigh over 254 lbs, have not more than 5 gal. of fuel capacity, best speed not to exceed 55 KIAS, and with a power off stall speed not more than 24 kts.

Rules, regulatons, and definitions vary from country to country and it is your responsibility to research a particular country's rules governing experimental aviation.

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