diff --git a/src/patch b/src/patch
deleted file mode 100644
index 937f74c5b..000000000
--- a/src/patch
+++ /dev/null
@@ -1,66 +0,0 @@
-diff --git a/src/karts/kart.cpp b/src/karts/kart.cpp
-index f9d6cd9..f243d2a 100644
---- a/src/karts/kart.cpp
-+++ b/src/karts/kart.cpp
-@@ -1098,7 +1098,7 @@ void Kart::update(float dt)
- 
-     // TODO: hiker said this probably will be moved to btKart or so when updating bullet engine.
-     // Neutralize any yaw change if the kart leaves the ground, so the kart falls more or less
--    // straight after jumping, but still allowing some "boat shake" (roll and pitch).
-+    // straight after jumping, but still allowing some "boat shake" (roIll and pitch).
-     // Otherwise many non perfect jumps end in a total roll over or a serious change of
-     // direction, sometimes 90 or even full U turn (real but less fun for a karting game).
-     // As side effect steering becames a bit less responsive (any wheel on air), but not too bad.
-@@ -2023,30 +2023,6 @@ void Kart::updatePhysics(float dt)
-     m_max_speed->setMinSpeed(min_speed);
-     m_max_speed->update(dt);
- 
--    // If the kart is flying, keep its up-axis aligned to gravity (which in
--    // turn typically means the kart is parallel to the ground). This avoids
--    // that the kart rotates in mid-air and lands on its side.
--    if(m_vehicle->getNumWheelsOnGround()==0)
--    {
--        btVector3 kart_up = getTrans().getBasis().getColumn(1);  // up vector
--        btVector3 terrain_up = m_body->getGravity();
--        float g = World::getWorld()->getTrack()->getGravity();
--        // Normalize the gravity, g is the length of the vector
--        btVector3 new_up = 0.9f * kart_up + 0.1f * terrain_up/-g;
--        // Get the rotation (hpr) based on current heading.
--        Vec3 rotation(getHeading(), new_up);
--        btMatrix3x3 m;
--        m.setEulerZYX(rotation.getX(), rotation.getY(), rotation.getZ());
--        // We can't use getXYZ() for the position here, since the position is
--        // based on interpolation, while the actual center-of-mass-transform
--        // is based on the actual value every 1/60 of a second (using getXYZ()
--        // would result in the kart being pushed ahead a bit, making it jump
--        // much further, depending on fps)
--        btTransform new_trans(m, m_body->getCenterOfMassTransform().getOrigin());
--        //setTrans(new_trans);
--        m_body->setCenterOfMassTransform(new_trans);
--    }
--
-     // To avoid tunneling (which can happen on long falls), clamp the
-     // velocity in Y direction. Tunneling can happen if the Y velocity
-     // is larger than the maximum suspension travel (per frame), since then
-diff --git a/src/physics/btKart.cpp b/src/physics/btKart.cpp
-index bdb8f55..2aa0096 100644
---- a/src/physics/btKart.cpp
-+++ b/src/physics/btKart.cpp
-@@ -387,6 +387,17 @@ void btKart::updateVehicle( btScalar step )
-         if(m_wheelInfo[i].m_raycastInfo.m_isInContact)
-             m_num_wheels_on_ground++;
-     }
-+
-+    // If the kart is flying, try to keep it parallel to the ground.
-+    if(m_num_wheels_on_ground==0)
-+    {
-+        btVector3 kart_up    = getChassisWorldTransform().getBasis().getColumn(1);
-+        btVector3 terrain_up(0,1,0);
-+        btVector3 axis = kart_up.cross(terrain_up);
-+        // Times 10 gives a nicely balanced feeling.
-+        m_chassisBody->applyTorqueImpulse(axis * 10);
-+    }
-+
-     // Work around: make sure that either both wheels on one axis
-     // are on ground, or none of them. This avoids the problem of
-     // the kart suddenly getting additional angular velocity because