rich , i wasn't saying it was built wrong , just thought the angle didn't look right and that there was a CHANCE the part was put in wrong. in fact i did find that the trust angle on the part that was installed was at 7 degrees when it was supposed to be only 3 . however the part was installed right. you may have been given a bad part . anyways i'm thinking the high angle was driving the nose into the ground at high speed or high power. thanks ,warbird