I have built my first diy plane and I choose the Flight Test Alpha. I followed the instructional video. When it came time to start installing the Flight Test Power Pack F I followed the video and bought the servo tester so I could hook it up to the engine and make sure that the engine is turning counterclockwise as indicated with an arrow on the engine. I installed the prop with the letters facing the direction that i want to fly as it says in the video. All this was done as instructed in the video and yet my plane wants to fly backwards and i have no idea why. Any help???