Just finished the rebuild of my Spacewalker. I was disappointed in the performance my Saito91 gave it with a 14x6 APC prop. This plane should do all the basic maneuvers with grace and mine could not even loop! I put a Saito 120 with a 15X8 APC prop and was VERY satisfied with the plane. Also changed the wing incidence to +0.5 down from the +3 as it seemed that with the larger engine the plane wanted to always climb with anything mor than 1/4 th. Pete