Drela SuperGee II — a 1.5 m discus-launch glider, drawn to the planvsSchempp-Hirth Standard Cirrus — 15 m, two Wortmann sections
root section ag455ct02r → fxs02196 · tip section ag47ct02r → fx6617a2 · area 218576 mm² → 10001997 mm² · span 1498 mm → 15000 mm · te thickness 0 mm → 2 mm · root chord 183 mm → 855 mm
units
These analyses are not directly comparable
- different trim loads (2 N vs 3237 N) — each wing is carrying a different weight
The geometry comparison below is unaffected — it is a comparison of shapes, not of runs.
- Drela SuperGee II — a 1.5 m discus-launch glider, drawn to the plan
- Schempp-Hirth Standard Cirrus — 15 m, two Wortmann sections
What changed
| Property | Drela SuperGee II | Schempp-Hirth Standar… | Change | % |
|---|---|---|---|---|
| Geometry | ||||
| Span | 1498 mm | 15000 mm | +13502 mm | +901.3% |
| Root chord | 183 mm | 855 mm | +672 mm | +367.2% |
| Tip chord | 94 mm | 345 mm | +251 mm | +267.0% |
| Sweep parameter | 3.400 | 2.946 | -0.454 | -13.4% |
| Dihedral | 4.00° | 2.00° | -2.00° | -50.0% |
| Tip twist | 0.00° | -2.00° | -2.00° | — |
| TE thickness | 0 mm | 2 mm | +2 mm | +566.7% |
| Sections | 30 | 40 | +10 | +33.3% |
| Tip cap reach | 0.400 | 0.450 | +0.050 | +12.5% |
| Derived | ||||
| Aspect ratio | 10.266 | 22.496 | +12.229 | +119.1% |
| Area | 218576 mm² | 10001997 mm² | +9783421 mm² | +4476.0% |
| Taper | 0.514 | 0.404 | -0.110 | -21.4% |
| MAC | 151 mm | 705 mm | +553 mm | +365.2% |
| Sections | ||||
| Root section | ag455ct02r | fxs02196 | changed | — |
| Tip section | ag47ct02r | fx6617a2 | changed | — |
| Shapedeviation at matched span fractions, 64 samples | ||||
| Chord deviation (max) | 672 mm | |||
| Chord deviation (RMS) | 537 mm | |||
| Twist deviation (max) | 2.00° | |||
| Dihedral deviation (max) | 210 mm | |||
| Tip cap deviation (max) | 6820 mm | |||
Performance
CoefficientsDimensionless — how good the shape is, independent of size and speed.
Spanwise
withheld — “Drela SuperGee II” integrates to CL 0.056 against the polar’s CL at the same α (this analysis predates the loading reporting its own) 0.371 (0.15×); “Schempp-Hirth Standar…” integrates to CL 0.052 against the polar’s CL at the same α (this analysis predates the loading reporting its own) 0.541 (0.10×). A loading that does not integrate back to its own wing’s CL is not a coarse curve, it is a wrong one.
air, ρ = 1.225 kg/m³
data
| CD | Drela SuperGee II | Schempp-Hirth Standar… |
|---|---|---|
| 0.014 | 0.259 | 0.622 |
| 0.014 | 0.261 | 0.625 |
| 0.016 | 0.290 | 0.666 |
| 0.017 | 0.327 | 0.722 |
| 0.017 | 0.332 | 0.731 |
| 0.019 | 0.371 | 0.789 |
| 0.022 | 0.417 | 0.867 |
| 0.022 | 0.425 | 0.878 |
| 0.026 | 0.491 | 0.985 |
| 0.028 | 0.522 | 1.04 |
| 0.032 | 0.574 | 1.12 |
| 0.039 | 0.656 | 1.28 |