From d7b54a6440816ae9573f75f5068ef59521c7d4e3 Mon Sep 17 00:00:00 2001
From: andy <andy>
Date: Mon, 13 Dec 2004 23:49:03 +0000
Subject: [PATCH] Documentation for the new "contra" attribute on propeller
 tags.

---
 Docs/README.yasim | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/Docs/README.yasim b/Docs/README.yasim
index c6616b836..18a4a6caa 100644
--- a/Docs/README.yasim
+++ b/Docs/README.yasim
@@ -208,6 +208,14 @@ propeller: A propeller.  This element requires an engine subtag.
            gear-ratio:    The factor by which the engine RPM is multiplied
                           to produce the propeller RPM.  Optional (defaults
                           to 1.0).
+           contra:        When set (contra="1"), this indicates that the
+                          propeller is a contra-rotating pair.  It
+                          will not contribute to the aircraft's net
+                          gyroscopic moment, nor will it produce
+                          asymmetric torque on the aircraft body.
+                          Asymmetric slipstream effects, when
+                          implemented, will also be zero when this is
+                          set.
 
 piston-engine: A piston engine definition.  This must be a subelement
                of an enclosing <propeller> tag.