I was going to post about the lawn mower there was someone local to me who had one that flew a while ago he also built a pig.
Technically Penguins do fly only under water. They employ the same method as airborne birds do such as wing shapes and tail steering etc, hydrodynamics is similar only the water is more dense.
During the Falklands war the RAF broke quite a few Harriers doing a Gerwalk style stop maneuver whist fighting the Argentinian Mirages. They would get the Mirage behind them and then pull up and give it full vectored reverse and basically come to a complete stop and then target the Mirage. My old Boss was in the RAF at the time and worked on the Harriers he said that many of them came back with torsional stress damage due to this particular maneuver.
I guess if it was the Zentradi forces wouldn't have had to glass the planet just kill a few Valks and let the populous die off
According to physics the Bumble bee cant fly, I guess nobody told them yet.