How deep do need it to run?
Moderately deeper than a vehicular snorkel would otherwise allow.
The maximum length of a Snorkel is 10 yards (VE84)
Perhaps 100 yards?
TS:Under Pressure p. 52 gives that continental shelf waters have full
visibility to 50 yards, with -1 per 10 yards below (for -5 to Vision at
100 yards).
Coastal waters need only 10+2*10 = 30 yards for full obscurity (-10
vision penalty, effective invisibility), perhaps a more reasonable
design goal.
Not mad, just using unconventional names.
* Surely you don't mean dive-capable airships. (Maybe there
could be a dive-capable blimp with a retractable gasbag.)
So we're talking about a big, cigar-shaped, underwater
vehicle.
With the Cinematic lens full on, yes, but with moderate steampunk, no.
* When it surfaces, it refills air tanks. Sounds a bit like
a non-nuclear sub.
* Burning air is a bit iffy. You use the oxygen in the air
to burn fuel, perhaps hydrocarbons. Hydrogen would be
another option. When it runs submerged, the tanks are
used.
A complicated way to say "non-nuclear, air-independent
propulsion" :-)
What is it burning the hydrogen with?
I suppose you could have two sets of bags and electrolysis water to
hydrogen and oxygen with some process.
I suppose in GURPS we could have a "radium generator" which for setting
purposes can only be used for electrolysis, and that hydrogen fuel cell
burns the gasses? Or being steampunk, perhaps we use this to enhance
burning coal?
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