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House Rules

Liftwood is a plant with contra-gravitic properties that grows only in the highlands of Mars.  There are three species of liftwood used in the construction of flyers.  At TL 6 synthetic liftwood becomes available.

• TL: Tech level available.
• Kl: Volume, in kiloliters per displacement ton (14 kiloliters) of hull.
• Mass: Mass, in tonnes, per displacement ton (14 kiloliters) of hull.
• MCr: Price, in millions of credits, per displacement ton (14 kiloliters) of hull.
• LV: Lift Value per displacement ton (14 kiloliters) of hull.

Natural liftwood loses 10 percent of its lift value per year. Synthetic liftwood does not decay.

Improved Liftwood:  At TL 5, a chemical composition, liftwood enhancer, becomes available to treat natural liftwood (it has no effect upon artificial liftwood).   Treated liftwood doubles the liftwood's Lift Value but does not affect its decay.   The treatment costs §10 per displacement ton.  For purposes of transportation and storage, liftwood enhancer weighs one kilogram and costs §20 per liter.  Each liter can treat two displacement tons.

Liftwood Flyer Altitude: Multiply the Lift Value by the size of the vessel in displacement tons, and divide this by the actual loaded mass of the flyer.

• If the result is 2.2 or higher, the craft's maximum altitude is Low Orbit (300 km)
• If the result is 2.0 or higher, the craft's maximum altitude is Upper Stratosphere
• If the result is 1.8 or higher, the craft's maximum altitude is Lower Stratosphere
• If the result is 1.6 or higher, the craft's maximum altitude is Upper Troposphere*
• If the result is 1.4 or higher, the craft's maximum altitude is Lower Troposphere
• If the result is 1.2 or higher, the craft's maximum altitude is Very High (3000 meters).
• If the result is 1.0 or higher, the craft's maximum altitude is High (2400 meters).
• If the result is 0.8 or higher, the craft's maximum altitude is Medium (1800 meters).
• If the result is 0.6 or higher, the craft's maximum altitude is Low (1200 meters).
• If the result is 0.4 or higher, the craft's maximum altitude is Very Low (600 meters).

For results of less than 0.4 divide the result by 0.4 and multiply this by 600 to determine the flyer's maximum altitude in meters.

* A vessel equipped with an aether propeller can activate it at this altitude.

Liftwood Flyer Damage:  The flyer can take hits equal to 10 times its hull size, in displacement tons per altitude level.

Subtract the armor value of the flyer from the final penetration of the weapon.  This is the number of lifter hits the flyer takes in addition to any other damage rolled.  Each lifter hit reduces the maximum altitude of the flyer by 60 meters (10 lifter hits would reduce the flyer's maximum altitude by one flight level).  On a Major Waterline result, the vessel takes lifter hits as above in addition to a damage roll, but the flyer also suffers a loss of trim.  Recovering from a loss of trim result is a Difficult:  Pilot task and may be made immediately.  If successful, the ship immediately recovers trim, but everyone on board loses an action that turn (they are too shaken to act).  If the pilot fails his initial check, he may try again the next turn.  In the interim, the ship plummets 60 meters.  If the pilot recovers on the second or subsequent turns no one on board may take any actions for 2-12 turns (player characters and certain NPCs may subtract their initiative from this roll).  If the pilot does not recover before the flyer impacts the ground, the ship is destroyed and all aboard are killed.