Solution: If possible....change that landing gear. If you're like me you got spare this that and everything in your shop. You really need a larger prop for a fourstroke. Saito website says you can use up to an 18x6 for this engine...use all power this engine can deliver by use of the proper prop. Do yourself a favor ...get an APC 18x6W from Tower or your favorite local Hobby store, tune that Saito 150 up for optimal performance, and thank me later. You'll love the power. Put the O.S. 1.20 aside for a 1.20 sized plane.