64 lines
2.3 KiB
Plaintext
Executable file
64 lines
2.3 KiB
Plaintext
Executable file
@LAZYGLOBAL OFF.
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run once "lib/rocket".
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run once "lib/warp".
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function estimated_burn_duration {
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//
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// Calculate estimated burn duration for a maneuver node.
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// Based on:
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// https://en.wikipedia.org/wiki/Tsiolkovsky_rocket_equation
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// https://space.stackexchange.com/questions/27375/how-do-i-calculate-a-rockets-burn-time-from-required-velocity
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//
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parameter node is NEXTNODE.
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local exhaust_velocity is isp_sum() * (CONSTANT:G * KERBIN:mass).
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return ((SHIP:mass * exhaust_velocity) / SHIP:maxthrust) * (1 - CONSTANT:E^(-node:deltav:mag/exhaust_velocity)).
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}
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function execute_node {
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//
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// Execute given maneuver node (the next one by default).
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//
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parameter node is NEXTNODE.
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local burn_duration is estimated_burn_duration(node).
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print "=== EXECUTE MANEUVER NODE ===".
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print "Estimated burn duration: " + ROUND(burn_duration, 1) + "s".
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print "Aligning ship with burn vector..".
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SAS off.
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lock STEERING to node:deltav.
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wait until vang(SHIP:facing:vector, node:deltav) < 0.5.
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print "Initializing warp".
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warp_for(max(0, node:eta - (burn_duration/2) - 5)). // warp until 5s before node
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print "Approaching".
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wait until node:eta <= ceiling(burn_duration/2). // CEILING instead of ROUND, since we'd rather start the burn too soon to have time for perfecting the burn
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print "Burn!".
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lock THROTTLE to 1.0.
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// Decrease throttle linearly when the burn duration is less than 1 second
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wait until estimated_burn_duration(node) <= 1.
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lock THROTTLE to max(0.01, estimated_burn_duration(node)). // ensure we always finish by burning with at least 1% power
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// The burn vector will start to drift once we have very little left to burn. Therefore, take a "snapshot" of the burn vector as it is right now, and lock steering to it, instead of the dynamic vector
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local dv0 is node:deltav.
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lock STEERING to dv0.
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// Stop the burn once the "snapshot" vector dv0 and current burn vector start facing opposite directions
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wait until vdot(dv0, node:deltav) < 0.
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set THROTTLE to 0.0.
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print "=== MANEUVER NODE EXECUTED ===".
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print round(node:deltav:mag, 3) + "m/s delta-v remaining".
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unlock_control().
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wait 1.
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remove node.
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}
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