3 ms·

I am sure it is based on mass not weight.

• theoh 8y ago
  If it's this, the language used is "weighs" https://www.eaa.org/en/eaa/aviation-communities-and-interests/ultralights-and-ultralight-aircraft/getting-started-in-ultralight-flying/about-faa-part-103-for-ultralights https://www.eaa.org/en/eaa/aviation-communities-and-interest... There are separate regulations for lighter-than-air vehicles.
  • jawarner 8y ago
    Scientifically, weight would be the force of gravity on the object, not affected by buoyancy. So "weight" would be fine here. The legal definition might be different.
    • theoh 8y ago
      Yes, but pounds can be used to measure either weight or mass, and as the previous commenter indicated, it's mass we really care about.