3 ms·
AIUI the problem is the economics are pretty unfavorable for smaller-scale prototypes due to square-cube issues (drag and thus fuel costs is proportional to cro
by ThrustVectoring 17d ago
AIUI the problem is the economics are pretty unfavorable for smaller-scale prototypes due to square-cube issues (drag and thus fuel costs is proportional to cross-sectional area, lift and thus cargo capacity is proportional to volume). You'd need a very big airship to get a competitive economic niche between sea and traditional air freight, where you're faster and more flexible than sea transport and cheaper than traditional air freight.
- Figs 17d agoHmm. Couldn't you put solar panels on top for power (and fly above the clouds) + use some sort of sail when wind is available? It might be really slow, but if you can get the systems to be fully autonomous (no people needed to pilot it) and need very little / no fuel... then couldn't it become a rather cheap way to ship things that aren't urgent?
- ThrustVectoring 16d agoSolar panels don't have good enough power to weight ratios and aren't likely to contribute effectively. As far as sails go, you need a second medium to act as a keel, otherwise it's impossible to get a net push in any direction other than downwind.
- WalterBright 16d agoOne will quickly discover that when you're moving with the wind, any sail is going to sag empty.
- econ 16d agoThere is another niche if you make them several miles long and width. Then can use more conventional construction materials like a concrete shell. (We are of course not ready for that)
- foobarian 16d agoIn that case they should have those giant propellers that seem to spin at a few rotations per minute
- econ 14d agoWe should first build the floating cities. Some old ships welded together surrounded by styrofoam in nets with mud on top and Mangroves, lots of Mangroves... Neptune's park.
- WalterBright 16d agoAn airship made from concrete? Better off using Led for Zeppelins.