This was SVN commit r10288.

binaries/data/mods/public/art/actors/props/structures/viking/longboat_sail.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<actor version="1">
+  <castshadow/>
+  <group>
+    <variant frequency="100" name="sail">
+      <mesh>props/viking_lb_sail.dae</mesh>
+      <texture>props/kart_merchant_sail_a.png</texture>
+    </variant>
+  </group>
+  <material>player_trans.xml</material>
+</actor>

binaries/data/mods/public/art/actors/structures/viking/longboat.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<actor version="1">
+  <castshadow/>
+  <float/>
+  <group>
+    <variant frequency="1" name="Longboat">
+      <mesh>structural/viking_longboat.dae</mesh>
+      <props>
+        <prop actor="props/units/weapons/arrow_front.xml" attachpoint="projectile"/>
+        <prop actor="props/structures/viking/longboat_sail.xml" attachpoint="root"/>
+      </props>
+      <texture>structural/viking_longboat.png</texture>
+    </variant>
+  </group>
+  <material>player_trans.xml</material>
+</actor>

binaries/data/mods/public/simulation/templates/units/viking_longboat.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<Entity parent="template_unit_mechanical_ship_bireme">
+  <Identity>
+    <Civ>cart</Civ>
+    <SpecificName>Longboat</SpecificName>
+    <History>The first Triremes were built circa 650BC, and by 500BC the Trireme was the most widely used heavy warship of the Greek city-states. In the Trireme the outriggers were now an integral part of the ship's hull. The Trireme also had a partial or full fighting deck above the rowers. The length of the Trireme remained approximately 35-38 meters, and the beam was approximately 3.5 metres. A Trireme carried 170 oarsmen, plus twenty sailors and fourteen marines in Greek navies. The top speed of a Trireme was approximately 11.5 knots. Some Triremes may have been able to reach higher speeds in short bursts. A Trireme travelling from Athens to Mitylene in 427BC made the 350 kilometre trip in only 24 hours, averaging eight knots (14.6 km/h). The Trireme could accelerate much faster than a Bireme or Penteconter, and was much more manoeuvrable. This gave the Trireme an advantage in combat, where higher speed and manoeuvrability meant a better chance of victory.</History>
+    <Icon>units/viking_longboat.png</Icon>
+  </Identity>
+  <VisualActor>
+    <Actor>structures/viking/longboat.xml</Actor>
+  </VisualActor>
+</Entity>