If the idea is to get these contraptions ready for actual real world use, wouldn't testing them under real world conditions make more sense ?
Which they just ran into. And complained bitterly about.
The Wright Brothers had brass balls of steel to venture into largely unknown territory with things nobody had even tried before. Electric and solar power hass been tried for the better part of 25-30 years and it still doesn't work (and if you believe it does, I'd gleefully remind you of South Australia's ability to keep the lights on), and barring a shift to an absolutist world government decreeing it the winner, it won't (something to do with lack of energy density, overly large dependency on 'just the right' environmental conditions etc)
But I admit, it makes a wonderful festival parade.