Had a bit of , "shall we say difficulty" with the wing hinges and wheel doors either opening fully or staying in place. The wings pivoted and closed but not to their full extent. The hinge didn't have enough clearance to allow fully up position. The wheel doors worked fine except for one which didn't fit the pivot point. SO, I decided to retract the wheels and lower the wings and put her in the air. It's my second model in over 50 years and I also decided some 'artistic' license was allowed. Put a fan in front of the prop and it actually worked !