diff --git a/sounds/collision.ogg b/sounds/trike_collision.ogg
similarity index 100%
rename from sounds/collision.ogg
rename to sounds/trike_collision.ogg
diff --git a/sounds/engine.ogg b/sounds/trike_engine.ogg
similarity index 100%
rename from sounds/engine.ogg
rename to sounds/trike_engine.ogg
diff --git a/sounds/trike_touch.ogg b/sounds/trike_touch.ogg
new file mode 100644
index 0000000..90d35c4
Binary files /dev/null and b/sounds/trike_touch.ogg differ
diff --git a/trike_control.lua b/trike_control.lua
index 8321c8d..18fe52a 100644
--- a/trike_control.lua
+++ b/trike_control.lua
@@ -46,7 +46,7 @@ function trike.control(self, dtime, hull_direction, longit_speed,
 		    elseif self._engine_running == false and self._energy > 0 then
 			    self._engine_running = true
 	            -- sound and animation
-                self.sound_handle = minetest.sound_play({name = "engine"},
+                self.sound_handle = minetest.sound_play({name = "trike_engine"},
 	                {object = self.object, gain = 2.0,
                         pitch = 0.5 + ((self._power_lever/100)/2),max_hear_distance = 32,
                         loop = true,})
@@ -75,7 +75,7 @@ function trike.control(self, dtime, hull_direction, longit_speed,
                     --sound
                     if self.sound_handle then
                         minetest.sound_stop(self.sound_handle)
-                        self.sound_handle = minetest.sound_play({name = "engine"},
+                        self.sound_handle = minetest.sound_play({name = "trike_engine"},
 	                        {object = self.object, gain = 2.0,
                                 pitch = 0.5 + ((self._power_lever/100)/2),max_hear_distance = 32,
                                 loop = true,})
@@ -104,7 +104,7 @@ function trike.control(self, dtime, hull_direction, longit_speed,
                 else
                     --sound
                     minetest.sound_stop(self.sound_handle)
-                    self.sound_handle = minetest.sound_play({name = "engine"},
+                    self.sound_handle = minetest.sound_play({name = "trike_engine"},
 		                {object = self.object, gain = 2.0,
                             pitch = 0.5 + ((self._power_lever/100)/2),
                             max_hear_distance = 32, loop = true,})
diff --git a/trike_entities.lua b/trike_entities.lua
index 4942795..27f28dd 100644
--- a/trike_entities.lua
+++ b/trike_entities.lua
@@ -334,7 +334,7 @@ minetest.register_entity("trike:trike", {
 					    --airutils.hurt(self,toolcaps.damage_groups.fleshy - 1)
 					    --airutils.make_sound(self,'hit')
                         self.hp_max = self.hp_max - 10
-                        minetest.sound_play("collision", {
+                        minetest.sound_play("trike_collision", {
 	                        object = self.object,
 	                        max_hear_distance = 5,
 	                        gain = 1.0,
diff --git a/trike_utilities.lua b/trike_utilities.lua
index c8f9f8e..488f69e 100644
--- a/trike_utilities.lua
+++ b/trike_utilities.lua
@@ -216,13 +216,27 @@ function trike.testImpact(self, velocity)
         end
     end
 
+    if impact > 0.5  and self._longit_speed > 2 then
+        local noded = airutils.nodeatpos(airutils.pos_shift(p,{y=-0.1}))
+	    if (noded and noded.drawtype ~= 'airlike') then
+            minetest.sound_play("trike_touch", {
+                --to_player = self.driver_name,
+                object = self.object,
+                max_hear_distance = 15,
+                gain = 1.0,
+                fade = 0.0,
+                pitch = 1.0,
+            }, true)
+	    end
+    end
+
     if collision then
         --self.object:set_velocity({x=0,y=0,z=0})
         local damage = impact / 2
         self.hp_max = self.hp_max - damage --subtract the impact value directly to hp meter
 
         if self.driver_name then
-            minetest.sound_play("collision", {
+            minetest.sound_play("trike_collision", {
                 to_player = self.driver_name,
                 --pos = curr_pos,
                 --max_hear_distance = 5,
@@ -399,10 +413,12 @@ function trike.flightstep(self)
 
     if self.isinliquid then self._engine_running = false end
 
-    --[[if player then
-        trike.attach(self, player)
-    end]]--
-    self.object:set_acceleration(new_accel)
+    --added accell check to avoid mercurio server problem
+    if new_accel then
+        if new_accel.x ~= nil and new_accel.y ~= nil and new_accel.z ~= nil then
+            self.object:set_acceleration(new_accel)
+        end
+    end
     -- end lift
 
     --adjust wing pitch (3d model)