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NCAS Empress - Operations & Errata
« on: February 20, 2010, 08:20:45 AM »
A Guide to New Crewmen to the AS Empress
Compiled by Commander Oren Voorse, Ship's Engineer

The Airship Empress is 804 feet in length and 135' in diameter at its largest point, containing in excess of 7,200,000 cubic feet of lifting gas (helium.)  Since 1,000 cubic feet of helium can raise 60 pounds of weight, the gas aboard can lift 432,000 lbs.  This is only 95% of total gas capacity; the remainder is kept as an allowance for expansion due to temperature and altitude.

The airship is powered by three boilers, one to provide steam for the aft lift and thrust engines, one for the forward lift and thrust engines and one to power the pumps and generators, any of these three engines can be slaves to provide steam to replace either other boiler is out of service.

Engines are shaft drive steam turbines, a high efficiency system that reduces wasted steam and produce 1,200 horsepower to drive each prop assembly or various pumps and generators.  The boilers and drive engines are between station 92 and 107 for the aft drive, and 140 and 156.5 for the forward.  These details are not included in technical specifications and many other items are omitted for secrecy.

The Prop drives are a gearbox assembly that increases shaft speed and horsepower to drive 4-bladed props up to high rates, the power output can be increased by changing the pitch of the propeller blades to more efficient angles, reducing fuel consumption over earlier models.  The engines can drive the Empress at a maximum speed of 120 knots, with 90 knots being standard cruising speed.  The drive props are located at station 92 and 140, the lift props at station 107 and 156.5.

Fuel is a derivative of coal gas easily procured nearly anywhere in the world for gas lighting, if is delivered under pressure to a burner jet assembly that heats water to steam then superheats steam for maximum power output.  The Empress carries over 26,000 'gallons' of fuel and averages 2 gallons per mile, a vast improvement in efficiency over cola plants and since the gas weighs the same as air there are no ballast troubles as the fuel is depleted.  The boilers can be modified for coal, wood or kerosene but with a decrease in overall efficiency and payload.

The structural members of the Empress are a tough but light Duraluminum alloy, as are defensive plates found throughout the ship.  Additional structural support comes from steel cables of various diameters.  The gas bags are treated silk and the outer envelope is treated canvass.

Weight is always a carefully considered factor which leads to many considerations that aren't always appreciated by the crew.  Showers must be limited to prevent consumption of water, grey water must be maintained for ballast until clean fresh or salt water replaces washing water.  Grey water can be recycled to a degree, being pumped back through a filter but this causes wash water to be used only for that purpose as it cannot easily me made potable.  With a crew of 100 and a requirement of four pints of water a day (400 pounds of water daily for drinking alone) this calls for 48,000 pounds of water bunkered for a maximum ship's endurance.  Shipboard shower baths are restricted to 3 gallons per crewmember, which allows for a 2 minute shower (wet down, water off, lather up, rinse off) A shower day costs the ship 300 gallons of water (the same as 5 10-minute landsman's showers) or 2,400 pounds of water.

With weight in mind many things taken for granted on surface ships are curtailed on the Empress.  We have a single wringing washing machine and air dryer.  Only 11 support personnel are included in the ship
« Last Edit: November 20, 2011, 02:22:28 AM by Lord Palatine »

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Re: NCAS Empress - Operations & Errata
« Reply #1 on: November 20, 2011, 03:11:05 AM »
A Guide to New Crewmen to the AS Empress
Compiled by Lieutenant Oren Voorse, Ship's Engineer
Following Refit

The Airship Empress is 804 feet in length and 135' in diameter at its largest point, containing in excess of 7,200,000 cubic feet of lifting gas (helium.)  Since 1,000 cubic feet of helium can raise 60 pounds of weight, the gas aboard can lift 432,000 lbs.  This is only 95% of total gas capacity; the remainder is kept as an allowance for expansion due to temperature and altitude.

The airship is powered by three improved high pressure boilers, one to provide steam for the aft lift and thrust engines, one for the forward lift and thrust engines and one to power the pumps and generators, any of these three engines can be slaves to provide steam to replace either other boiler is out of service.

Engines are shaft drive steam turbines, a high efficiency system that reduces wasted steam and produce 2,000 horsepower to drive each pod assembly with for and aft props or various pumps and generators.  The boilers and drive engines are between station 92 and 107 for the aft drive, and 140 and 156.5 for the forward.  These details are not included in technical specifications and many other items are omitted for secrecy.

The Prop drives are gearbox assemblies that each increases shaft speed and horsepower to drive two 4-bladed props up to high rates, the power output can be increased by changing the pitch of the propeller blades to more efficient angles, reducing fuel consumption over earlier models.  The engines can drive the Empress at a maximum speed of 160 knots, with 120 knots being standard cruising speed.  The drive props are located at station 92 and 140, the lift props at station 107 and 156.5.

Fuel is a derivative of coal gas easily procured nearly anywhere in the world for gas lighting, if is delivered under pressure to a burner jet assembly that heats water to steam then superheats steam for maximum power output.  The Empress carries over 26,000 'gallons' of fuel and averages 1.5 gallons per mile, a vast improvement in efficiency over coal plants and since the gas weighs the same as air there are no ballast troubles as the fuel is depleted.  The boilers can be modified for coal, wood or kerosene but with a decrease in overall efficiency and payload.

The structural members of the Empress are a tough but light Duraluminum alloy, as are defensive plates found throughout the ship.  Additional structural support comes from steel cables of various diameters.  The gas bags are treated silk and the outer envelope is treated canvass.

Weight is always a carefully considered factor which leads to many considerations that aren't always appreciated by the crew.  Showers must be limited to prevent consumption of water, grey water must be maintained for ballast until clean fresh or salt water replaces washing water.  Grey water can be recycled to a degree, being pumped back through a filter but this causes wash water to be used only for that purpose as it cannot easily me made potable.  With a crew of 100 and a requirement of four pints of water a day (400 pounds of water daily for drinking alone) this calls for 48,000 pounds of water bunkered for a maximum ship's endurance.  Shipboard shower baths are restricted to 3 gallons per crewmember, which allows for a 2 minute shower (wet down, water off, lather up, rinse off) A shower day costs the ship 300 gallons of water (the same as 5 10-minute landsman's showers) or 2,400 pounds of water.

With weight in mind many things taken for granted on surface ships are curtailed on the Empress.  We have a single wringing washing machine and air dryer.  Only 11 support personnel are included in the ship

 

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