diff --git a/lib_planes/utilities.lua b/lib_planes/utilities.lua
index fb32bfe..1ca5b8f 100644
--- a/lib_planes/utilities.lua
+++ b/lib_planes/utilities.lua
@@ -329,7 +329,7 @@ function airutils.testImpact(self, velocity, position)
 
     if self._last_touch == nil then self._last_touch = 1 end
     if self._last_touch <= 1 then self._last_touch = self._last_touch + self.dtime end
-    if vertical_impact > 0.5  and self._longit_speed > self._min_speed/2 and self._last_touch >= 1 then
+    if vertical_impact > 1.0  and self._longit_speed > self._min_speed/2 and self._last_touch >= 1 then
         self._last_touch = 0
         local noded = airutils.nodeatpos(airutils.pos_shift(p,{y=touch_point}))
 	    if (noded and noded.drawtype ~= 'airlike') then