Warning: Maths!
Forge + Factory + power = +100% hammers
So in BTS at size six a 3-pop whip gets you 180 hammers and costs 42 food every ten turns
42 food means you need a +4 surplus, which is one corn and two mines, then a farm then another mine, so say that gets you another 10 base hammers per turn that's +200 hammers, so your city is making 380 hammers every 10 turns.
Meanwhile at a larger size, making, say 20, 30 or 40 base HPT you get 40, 60 or 80HPT, which is 400, 600 or 800 hammers every ten turns.
With just a forge the 3-pop whip gets you 117 hammers + 100 = 217 every 10 turns while your 20/30/40 hammers get you 25/37/50 HPT or 250/370/500 hammers.
Perhaps it isn't the factories that necessarily make the difference, it's the overall hammers per turn being over 21.
Forge + Factory + power = +100% hammers
So in BTS at size six a 3-pop whip gets you 180 hammers and costs 42 food every ten turns
42 food means you need a +4 surplus, which is one corn and two mines, then a farm then another mine, so say that gets you another 10 base hammers per turn that's +200 hammers, so your city is making 380 hammers every 10 turns.
Meanwhile at a larger size, making, say 20, 30 or 40 base HPT you get 40, 60 or 80HPT, which is 400, 600 or 800 hammers every ten turns.
With just a forge the 3-pop whip gets you 117 hammers + 100 = 217 every 10 turns while your 20/30/40 hammers get you 25/37/50 HPT or 250/370/500 hammers.
Perhaps it isn't the factories that necessarily make the difference, it's the overall hammers per turn being over 21.
Completed: RB Demogame - Gillette, PBEM46, Pitboss 13, Pitboss 18, Pitboss 30, Pitboss 31, Pitboss 38, Pitboss 42, Pitboss 46, Pitboss 52 (Pindicator's game), Pitboss 57
In progress: Rimworld
In progress: Rimworld