Liftengine Elevator Simulation
Liftengine (shown in red) hauls up chain of masses below. Liftengine is
also counterweight in this case.
To start, move cursor over applet, and then move cursor off applet. To stop move cursor over applet.

Applet parameters:
TOWER_TYPE: 0 = static tower, 1 = Coriolis push static tower, 2 =
lift engine elevator, 3 = climber elevator, 4 = siphon.
PLANET_MASS: the planet mass (m). The parameter is multiplied by 10^20.
PLANET_RADIUS: the planet radius (m).
PLANET_PERIOD: the planet rotation period (s).
BODY_MASS: mass of bodies in tower (Kg).
RADIAL_VMAX: maximum radial velocity of climbing masses. (m/s)
COUNTERWEIGHT: mass of counterweight. If no counterweight, top mass is
set equal to mass of bodies in tower (kg).
TIE_L0: unstretched length of ties between bodies in tower (m)
TIE_LMAX: maximum (breaking) length of ties.
TIE_K: Tie spring constant.
TOWER_RADIUS: radial distance of topmost mass from planet (m).
MAX_TOWER_RADIUS: (siphon only) radial distance at which masses are
released from siphon.
NBODIES: the number of masses in the tower. e.g. a 230,000 km tower with
1000 km ties will need 230 or more masses. This number is used to minimize
the number of masses the code processes.
DELTA_T: time interval DT (ms) to use. If negative, the number represents
the maximum distance (m) for any body to move, and results in a variable DT
START_DELAY: delay in seconds (in simulation model) before climbers/
lifengine start operation.
EVENT_TIME: time in seconds (in simulation model) before an event
occurs. 0 = no event.
EVENT_NUM: event to happen at event time. 1 = shatter tower by breaking
all ties, 2 is release tower at base by breaking lowest tie. 3 is break
a particular tie number given by EVENT_PARAM1 (top mass is mass 1, and tie
below it is tie 1, and so on downwards. 4 is stop climbers, lift engine.
EVENT_PARAM1: event parameter 1
EVENT_PARAM2: event parameter 2
VIEW: View required. 0 is South pole view with tower radial line held
in one position (no rotation), 1 is South pole view with rotation. 3 = view
counterweight motion about tower radial line. 4 is same as 1, but with tower
angle and tension shown graphically at bottom of display