Full Porn Pics - toocatsoriginals: CH-47 Chinooks in Afghanistan Demonstrating the “Halo Effect,” Officially Known as the “Kopp-Etchells Effect” - When Sand and Dust Hit a Rapidly-Spinning Rotor. Sand and dust hitting a spinning helicopter rotor can cause erosion,

toocatsoriginals: CH-47 Chinooks in Afghanistan Demonstrating the “Halo Effect,” Officially Known as the “Kopp-Etchells Effect” - When Sand and Dust Hit a Rapidly-Spinning Rotor. Sand and dust hitting a spinning helicopter rotor can cause erosion,

toocatsoriginals: CH-47 Chinooks in Afghanistan Demonstrating the “Halo Effect,”