were any similar tests conducted into using helium balloons to lift an entire house?
Pete Docter: The first thing our technical team did when they started working on the balloons was to figure out how many balloons it would take to lift a house in real life. Here’s his math: Carl’s house is 1,600 sq ft. He found some figures saying that the average 1,600 sq ft house weighs about 345,000 lbs, of which 160,000 lbs is from the foundation, and about 30,000 lbs is from the garage. Since Carl lifts off and leaves the foundation behind, that leaves about 155,000 lbs, which is 77.5 US tons or 70,306 kg, which the canopy needs to lift. Accelerating toward the ground at 9.8 m/s2, that’s 688,998 N of force from gravity that the canopy has to overcome. With the density of helium at .1786 kg/m3 and representing a balloon as a sphere with a radius of 2.78 ft. (like weather balloons), each balloon can generate 4.5 N of buoyant force. To generate at least 688,998 N of force to overcome gravity, you’d need 153,053 helium-filled, 5.56 ft diameter balloons. If you’re trying this with big
