I got confused by the dual units here:
> 65cm torpedoes have enough fuel to travel in excess of 100 kilometers at 50 knots for just over an hour.
Turns out 1 knot/hr is nearly 2km/h so that checks out. Weird nautical units.
This is also why you can rough 1knot:2km; you're dividing those 10,000,000 old-world-meters by 5400 (90°*60').
I always forget the definition of the nautical distance. Thanks for the reminder. There's also the knot in a rope every certain distance that would get counted against a stop watch to see how fast the ship was moving.
Silver oxide-aluminium (AgO-Al)
Silver oxide-zinc (AgO-Zn)
Lithium-Ion (Li-Ion)
Lithium-polymer
Lithium-iron phosphate (LiFePO4)
1,040 Wh/kg
490 Wh/kg
600 Wh/kg
600 Wh/kg
520 Wh/kg
The F21 is powered by a new generation of silver oxide-aluminium (AgO-Al) sea-water primary battery using dissolved sodium dioxide powder as electrolyte and incorporating a new electronic closed loop electrolyte circulation system.
In comparison with silverzinc and other technologies, AgO-Al energy density is unrivalled. It ensures both maximum speed beyond 50 knots and endurance around 1 hour without compromising safety.
TIL: A silver-oxide battery (IEC code: S) is a primary cell with a very high energy-to-weight ratio. They are available in small sizes as button cells, where the amount of silver used is minimal and not a significant contributor to the product cost.
Turns out there are silver based battery that can do almost double. So what's the catch as to why it's not being adopted by phones?
I think you meant to write 1 knot hour is nearly 2 km -- a weird way to compare distances, but hey, the math works.