Well I checked with SPA and I've learned that even though the Mustang X is on their "approved" and "legal" airplane list, I cannot use the enlarged (10%) plans to make a 60 size version. SPA will only allow a 3% or less deviation from the original size. Bummer. I prefer the .60 size version, but now I'll have to consider whether of not to build the original 55" wing version and power it with my OS.55AX. If I decide NOT, I'll have to decide on another plane. Maybe a Deception or a Dirty Birdi.

ChiefK