# HG changeset patch
# User peter1138
# Date 1203082093 0
# Node ID e81f60ee6a5932137cb0ad6252492d40834161d4
# Parent  8816b5ff28f5f88e56ab660d5499b490efef70fb
(svn r12144) -Codechange: Adjust aircraft slowing algorithm so that very fast
aircraft slow down more rapidly than slower aircraft. This prevents them
from reaching the end of the runway at high speed, and also stops slow
aircraft from slowing down too much at the start of the runway.

diff -r 8816b5ff28f5 -r e81f60ee6a59 src/aircraft_cmd.cpp
--- a/src/aircraft_cmd.cpp	Fri Feb 15 11:02:50 2008 +0000
+++ b/src/aircraft_cmd.cpp	Fri Feb 15 13:28:13 2008 +0000
@@ -933,7 +933,13 @@
 
 	v->subspeed = (t=v->subspeed) + (byte)spd;
 
-	if (!hard_limit && v->cur_speed > speed_limit) speed_limit = v->cur_speed - (v->cur_speed / 48);
+	/* Aircraft's current speed is used twice so that very fast planes are
+	 * forced to slow down rapidly in the short distance needed. The magic
+	 * value 16384 was determined to give similar results to the old speed/48
+	 * method at slower speeds. This also results in less reduction at slow
+	 * speeds to that aircraft do not get to taxi speed straight after
+	 * touchdown. */
+	if (!hard_limit && v->cur_speed > speed_limit) speed_limit = v->cur_speed - max(1, (v->cur_speed * v->cur_speed) / 16384);
 
 	spd = min(v->cur_speed + (spd >> 8) + (v->subspeed < t), speed_limit);