Wasp 229B2 / 221C4
After the 1974 model 229B3, the 221C4 was produced. The first number is the size of the sail (sq.feet) and C4 stands for height of controlbar (4 feet).
Reportedly the 221C4 had a lot less wrinkles in the sail than the 229B3.
Wing area: 18.20 m²
Hang glider weight: 22 kg
Wing area: 221 sq.ft