I recently got a Phantom 1 and crashed it into the house. No surprise there. It cracked up a couple of the CF props so I ordered a new set from Amazon. They were listed for the P1, but when I got them they were difinitely shorter that the others that I had on before. I decided to try them, thinking that there might be a decrease in performance. Now, I can't get the quad off the ground. When I go full throttle, the thing just noses over. Back props are stronger than the front two. I even had a friend hold the quad up and tried a takeoff like that hoping the props might have a chance to catch up. He never let go. Said that back props definitely pulling harder than the front. Is this a prop problem or did I damage something internal? Any help much appreciated.