I recently purchased an Aeroworks S2 cub from a guy who was the original owner. He never flew it and I got the bare airframe. About 9 months old.
Nice looking plane with a lot of detail and good workmanship. Also a bunch of poor workmanship and poor quality materials.
Many pieces of plywood are delaminated (probably 75% in the front half of the fuselage). It obviously came from the factory this way.
The cowling mount holes were drilled in the wrong place.
The motor mount template results in the motor being 1/4 " off center on the cowling.
The landing gear has a large amount of tow out with no way to adjust or bend without ruining it.
The ailerons and elevator ( factory hinged) don't have enough travel because gap is too tight.
The tailwheel spring hits bottom of rudder requiring mod.
An experienced builder should be able to fix some of these things, but not all, without a bunch of expense (like a new Robart gear).
Aeroworks sells very complete arfs and you pay a premium for this, in addition to the supposed high quality. I have one of their 50 cc Yak 54's and a Cessna 195 and would agree with that statement on those two planes. But not at all on this one.
I spent about 6 hours and 4 ounces of super glue wicking it into every accessible plywood edge in the plane. Also a lot of clamping. Reinforced a couple areas where the outside laminate of plywood was missing.
Removed blind nuts, filled old holes and redrilled cowling mount holes.
Mounted motor by putting on firewall (plane vertical with cylinder removed from motor) and mounting cowl over the top then centering motor and removing cowl then marking location.
Made aluminum shim to put under tailwheel spring to move away from rudder.
May have to replace gear with $130 Robart unit if ground handling is too bad. May have to cut and rehinge ailerons and elevators if flying shows too little travel (they don't come close to hitting the beveled edges). Hopefully super glued plywood will hold up.
I've got about 12 hours in this plane just getting to where it should have been out of the factory. I understand that not everything may be 100% on an Arf from China, but this thing is not ready for prime time. Maybe Aeroworks has fixed some of these quality issues, but if not, I would look elsewhere for a 50cc scale Cub.
Not sure if the guy I bought it from knew about the major plywood problems, but I should have looked it over better. Never expected this on a new plane.
By the way, I called Aeroworks about the quality issues and they said we can't do anything for you. I won't own a fourth Aeroworks plane.