snowflake [none/use name] to Worldbuilding • 14 days agoHow could a noiseless flying machine be built in the far future? (Or one with a pleasing hum instead of sounding like a drone or helicopter?)external-linkmessage-square11 fedilinkarrow-up111
arrow-up111external-linkHow could a noiseless flying machine be built in the far future? (Or one with a pleasing hum instead of sounding like a drone or helicopter?)snowflake [none/use name] to Worldbuilding • 14 days agomessage-square11 Commentsfedilink
Lower density than air balloon