SpaceNews

Pangea Aerospace raises Series A round to fund space propulsion work

Pangea Aerospace successfully fired an aerospike engine in a series of tests at a DLR facility in Germany in 2021. Credit: Pangea Aerospace WASHINGTON — Spanish propulsion startup Pangea Aerospace has ...
来自MSN

Diesel engines need air, submarines run underwater, so how do diesel submarines work?

While diesel engines don't need spark plugs, they do need air ventilation for proper combustion. This is a problem for vessels traveling underwater, such as submarines. Yet diesel submarines exist and ...