Grob G103

• Grob G103 Twin Astir Built since 1976, with retractable or fixed undercarriage in front of the center of gravity and water ballast.
• Grob G103a Twin II a new and unrelated design that replaced the Twin Astir from 1980, with fixed undercarriage behind the center of gravity and nose wheel.
• Grob G103c Twin III Replaced the Twin II from 1989, with a new triple-trapezoidal wing, lower control forces and higher airspeed limitations.