But Mr. Champion said that comparing the payloads of trucks and cars was valid.
The largest fly hundreds of feet, carrying altimeters, parachutes and payloads of eggs.
On Wednesday, 18 planes were prepared to deliver payloads of dry ice, salt and silver iodide should clouds prove menacing.
The commercially made drones discussed at the UK embassy meeting could carry payloads of 2kg to 50kg.
It may have oceans today only because it was bombarded by comets and meteorites carrying payloads of ice.
This means that our patent-pending Hendo Hover Engine technology can enable platforms to hover over non-ferrous materials with payloads of virtually any size and weight".
Boeing came up with the Delta IV rocket, while Lockheed designed the Atlas V, which would carry payloads of more than 19,000 pounds into orbit.
There were cargo tricycles, known locally as "vans," heading to markets bearing heaping payloads of bamboo, watermelons, metal pipes, eggs, live animals.
In an interview, Mr. Beames said that Stratolaunch, which will be able to carry payloads of over 500,000 pounds, was the right size.
But its Zelzal II missiles, supplied by Syria and Iran, carry payloads of up to 600kg and are accurate to within 100 metres at a range of 200km.
LauncherOne is a two-stage rocket capable of carrying payloads of up to 500 pounds into orbit for less than $10 million a launch.
