Not a waterwheel-like propeller, but a fan-like propeller, all submerged in water.
How much force is really needed for a steamship to move forward?
A small boat can be rowed by one person.
How many people are needed to row a big boat twenty or thirty meters long?
How long does it really take to develop a steamship?
They haven't even built a relatively large wooden boat yet.
Ma Lin knows the structure of large wooden boats.
Assembling many planks onto a very solid keel to form the hull.
Then install the sides of the boat.
There will be many problems in between.
Ma Lin feels that solving these issues under the current social conditions is not easy.
There are simply problems everywhere.
They don't even need wooden boats twenty meters long at all.
Even if they wanted to build one, they wouldn't have enough manpower.
