I was gathering up my gear for a early morning flight just outside when my wife and I heard this horrible rumbling sound that was starting to shake the living room. We looked at each other in shock as to what is going on??? Both of us were thinking something is going on in the street just outside as it just kept getting louder so I started to head to the front door, but instead quickly looked out of the kitchen window. I seen not one but two Chinook Helicopters flying past in tandem directly overhead. Wow, so loud with four rotors disrupting air and pushing it downward with such force. They were low, legally so, but then it occurred to me that the air below would be stirred up like a rapids on a river. I was glad to be on the ground instead of in the air at the time not wanting to test the prop wash air turbulence theory for myself. 
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