MIT Daedalus 88 — the 34 m human-powered wingvsDownwind glide foil — high aspect reference front wing
root section dae11 → e818 · tip section dae31 → — · sweep parameter 0.484 → 9.717 · dihedral 1.00° → -2.50° · area 31712462 mm² → 121109 mm² · span 34100 mm → 1240 mm
units
These analyses are not directly comparable
- different fluids (air vs water-salt) — density and viscosity both differ, so the drag numbers are not on the same footing
- different trim loads (1020 N vs 932 N) — each wing is carrying a different weight
The geometry comparison below is unaffected — it is a comparison of shapes, not of runs.
- MIT Daedalus 88 — the 34 m human-powered wing
- Downwind glide foil — high aspect reference front wing
What changed
| Property | MIT Daedalus 88 | Downwind glide foil | Change | % |
|---|---|---|---|---|
| Geometry | ||||
| Span | 34100 mm | 1240 mm | -32860 mm | -96.4% |
| Root chord | 1050 mm | 130 mm | -920 mm | -87.6% |
| Tip chord | 762 mm | 48 mm | -714 mm | -93.7% |
| Sweep parameter | 0.484 | 9.717 | +9.233 | +1907.6% |
| Dihedral | 1.00° | -2.50° | -3.50° | -350.0% |
| Tip twist | -1.50° | -2.50° | -1.00° | +66.7% |
| TE thickness | 2 mm | 0 mm | -1 mm | -86.7% |
| Sections | 40 | 30 | -10 | -25.0% |
| Tip cap reach | 0.250 | 0.400 | +0.150 | +60.0% |
| Derived | ||||
| Aspect ratio | 36.667 | 12.696 | -23.971 | -65.4% |
| Area | 31712462 mm² | 121109 mm² | -31591352 mm² | -99.6% |
| Taper | 0.726 | 0.369 | -0.356 | -49.1% |
| MAC | 939 mm | 104 mm | -835 mm | -88.9% |
| Sections | ||||
| Root section | dae11 | e818 | changed | — |
| Tip section | dae31 | — | changed | — |
| Shapedeviation at matched span fractions, 64 samples | ||||
| Chord deviation (max) | 920 mm | |||
| Chord deviation (RMS) | 835 mm | |||
| Twist deviation (max) | 1.13° | |||
| Dihedral deviation (max) | 325 mm | |||
| Tip cap deviation (max) | 16520 mm | |||
Performance
CoefficientsDimensionless — how good the shape is, independent of size and speed.
ForcesNewtons and watts — what each wing actually carries and costs at this condition.
Spanwise
withheld — “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×); “Downwind glide foil” integrates to CL 0.061 against the polar’s CL at the same α (this analysis predates the loading reporting its own) 0.446 (0.14×). A loading that does not integrate back to its own wing’s CL is not a coarse curve, it is a wrong one.
mixed fluids (air, water (sea))
data
| V (kt) | MIT Daedalus 88 | Downwind glide foil |
|---|---|---|
| 11.54 | 37.99 | 33.67 |
| 12.61 | 43.38 | 33.40 |
| 12.64 | 43.47 | 33.40 |
| 13.68 | 46.93 | 32.23 |
| 14.00 | 47.63 | 31.87 |
| 14.74 | 49.26 | 30.65 |
| 15.36 | 49.23 | 29.65 |
| 15.81 | 49.21 | 28.78 |
| 16.72 | 47.26 | 27.04 |
| 16.88 | 46.91 | 26.73 |
| 17.95 | 43.90 | 24.67 |
| 18.08 | 43.55 | 24.41 |
| 19.01 | 41.08 | 22.65 |
| 19.44 | 40.00 | 21.85 |
| 20.08 | 38.37 | 20.76 |
| 20.80 | 36.58 | 19.54 |
| 21.15 | 35.71 | 19.00 |