I have a Goldberg Extra 300 with a OS120 engine. When doing a inside loop I used max elevator and the airplane goes straight up for a very short distance then moves to the left at a 45 degree angle basically stalling out and just making a complete loop. Several times it won't complete the loop. Throttle is set at half way and airplane is moving fairly quickly entering the loop. I would think the airplane would do a very tight loop and appreciate comments on if this is normal or not