Concepts
To develop a lighter sailplane with good climb in weak conditions, low momentum in an outlanding but still with good interthermal performance at speed.
To achieve this, a short pitch couple reduces the wetted area and weight, the swept fin with no boom being an inherently efficient structure.The wing is small, which affects the constraints on optimisation of lift distribution and allows reduced adverse yaw.
SG-1 is similar looking
to Genesis but is based on quite different aero'. The Genesis wing is
stabilising with a small positive foil CMc/4. In SG-1 all the static pitch
stability is created by the tail and the wing foils are about CMc/4=-0.06
which enables the wide drag bucket required. On SG-1 the tailoring of
the lifting surfaces and the management of the pressure recovery on the
afterpart of the fuse are unique.
Length (m)
Height (m)
Wing area (m^2)
Aspect ratio
Empty mass (kg)
Water ballast
All up mass with 90kg pilot (kg)
Max all up mass (kg)
Wing load at 265kg (kg/m^2)
Wing load at 233kg (kg/m^2)
Stall speed at 233kg (knots)
Minimum sink speed at 42 knots (m/s)
Design dive speed (knots)
Ultimate load factors
Undercariage
13.9
4.52
1.84
8.58
22.5
143
none
233
265
30.85
27.15
35
0.51
152
+8.8, -4.0
Retractable tandem