Full details for the Propeller technology, from level 1 to level 4.
A naval technology that strengthens fleet units across the board. "Propeller" scales up to level 4. Maximum effect: "Mobility +4". Available from the start of research. Prioritise on Pacific, Atlantic and Mediterranean scenarios.
| Level | Gold | Industry | Energy | Tech | Effet |
|---|---|---|---|---|---|
| L1 | 3500 | 700 | 0 | 0 | Mobility +1 |
| L2 | 7500 | 1500 | 0 | 0 | Mobility +2 |
| L3 | 30000 | 6000 | 0 | 0 | Mobility +3 |
| L4 | 125000 | 25000 | 0 | 0 | Mobility +4 |