Schempp-Hirth Standard Cirrus — 15 m, two Wortmann sectionsvsMIT Daedalus 88 — the 34 m human-powered wing
root section fxs02196 → dae11 · tip section fx6617a2 → dae31 · area 10001997 mm² → 31712462 mm² · span 15000 mm → 34100 mm · tip chord 345 mm → 762 mm · sweep parameter 2.946 → 0.484
units
These analyses are not directly comparable
- different trim loads (3237 N vs 1020 N) — each wing is carrying a different weight
The geometry comparison below is unaffected — it is a comparison of shapes, not of runs.
- Schempp-Hirth Standard Cirrus — 15 m, two Wortmann sections
- MIT Daedalus 88 — the 34 m human-powered wing
What changed
| Property | Schempp-Hirth Standar… | MIT Daedalus 88 | Change | % |
|---|---|---|---|---|
| Geometry | ||||
| Span | 15000 mm | 34100 mm | +19100 mm | +127.3% |
| Root chord | 855 mm | 1050 mm | +195 mm | +22.8% |
| Tip chord | 345 mm | 762 mm | +417 mm | +120.9% |
| Sweep parameter | 2.946 | 0.484 | -2.462 | -83.6% |
| Dihedral | 2.00° | 1.00° | -1.00° | -50.0% |
| Tip twist | -2.00° | -1.50° | +0.50° | -25.0% |
| TE thickness | 2 mm | 2 mm | -1 mm | -25.0% |
| Tip cap reach | 0.450 | 0.250 | -0.200 | -44.4% |
| Derived | ||||
| Aspect ratio | 22.496 | 36.667 | +14.172 | +63.0% |
| Area | 10001997 mm² | 31712462 mm² | +21710465 mm² | +217.1% |
| Taper | 0.404 | 0.726 | +0.322 | +79.9% |
| MAC | 705 mm | 939 mm | +234 mm | +33.3% |
| Sections | ||||
| Root section | fxs02196 | dae11 | changed | — |
| Tip section | fx6617a2 | dae31 | changed | — |
| Shapedeviation at matched span fractions, 64 samples | ||||
| Chord deviation (max) | 417 mm | |||
| Chord deviation (RMS) | 273 mm | |||
| Twist deviation (max) | 0.69° | |||
| Dihedral deviation (max) | 36 mm | |||
| Tip cap deviation (max) | 9568 mm | |||
Performance
CoefficientsDimensionless — how good the shape is, independent of size and speed.
Spanwise
withheld — “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×); “MIT Daedalus 88” integrates to CL 0.120 against the polar’s CL at the same α (this analysis predates the loading reporting its own) 0.913 (0.13×). 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 | Schempp-Hirth Standar… | MIT Daedalus 88 |
|---|---|---|
| 0.012 | 0.537 | 0.444 |
| 0.012 | 0.541 | 0.453 |
| 0.013 | 0.555 | 0.492 |
| 0.013 | 0.577 | 0.549 |
| 0.014 | 0.606 | 0.616 |
| 0.014 | 0.625 | 0.662 |
| 0.015 | 0.638 | 0.697 |
| 0.016 | 0.686 | 0.794 |
| 0.017 | 0.731 | 0.854 |
| 0.019 | 0.769 | 0.913 |
| 0.022 | 0.867 | 1.02 |
| 0.023 | 0.894 | 1.06 |
| 0.028 | 1.04 | 1.23 |
| 0.029 | 1.06 | 1.25 |
| 0.039 | 1.28 | 1.48 |