WingHopper · Designer · Guide · Sections · Reef · Methods · Pricing · FAQ
Open Assembly to start with Reference 1300. This is an original Winghopper reference design for editing and design studies. It is not a tested commercial foil, a verified mounting interface or a finished construction recipe.
| Component | Starting geometry |
|---|---|
| Front wing | Carve template, 1,000 mm nominal span, 185/55 mm root/tip chords, existing rounded tip extension |
| Stabilizer | 400 mm span, 85/35 mm chords, symmetric section, -1 degree incidence |
| Mast | 800 mm, integrated plate mount, 137/112 mm chords, 18.5/14 mm thicknesses |
| Fuselage | 32 x 32 mm body, tapering rear, 65 mm nose extension and 70 mm tail extension |
| Placement | 700 mm root-quarter-chord spacing; mast 150 mm aft of front-wing root quarter-chord |
| Operating point | 85 kg rider/equipment, 6 m/s, water density 1,025 kg/m3 |
The name is an approximate front-wing area class, not an exact area or a performance claim. Nominal span excludes the rounded tip extension. The exact geometry comes from the component parameters stored in the project.
Select any part in the scene or component list. Resize wings, change mast length/chords/thicknesses, and edit the fuselage cross-sections and extensions. Use saved wing/mast snapshots or the existing presets to replace a component.
For detailed wing curves and sections, choose Edit a copy in wing studio. Return through Assembly, select the component, then choose Use the open wing. This copies the current editor geometry into the assembly. It does not link the assembly to later edits or overwrite the original saved wing.
X points aft, Y starboard and Z up. Wings rotate about their root quarter-chord. Positive incidence is nose up. The mast position refers to its lower-section quarter-chord. Balance offset is all-up CG X relative to that mast location. The scene's balance marker shows that fore/aft input above the mast; it is not a modeled board, rider or vertical CG position.
Both wings enter one influence matrix, including their relative height and incidence. The solver enforces no normal flow at every panel control point. A fixed body-axis horseshoe wake and incompressible potential flow are used. The existing wing solver supplies canonical camber/twist panel geometry.
For the selected speed, mass and fixed shim angle, total lift is balanced against weight. The remaining pitch moment is reported separately. Positive means nose up. Use calculated balance position changes fore/aft CG to cancel that lifting-surface moment at the selected operating point.
Moments use the front-wing datum height. The results do not include board/CG height effects, mast or fuselage hydrodynamic forces, viscous drag, separation, stall, free-surface effects, ventilation or cavitation. High section loading or incidence is flagged; the flag is not a measured stall prediction. No result outside the angle search range is labeled lift-balanced.
The formulation follows the multiple-surface potential-flow approach described in the MIT AVL user primer. Winghopper is not running AVL, and this implementation has not been independently benchmarked against AVL or validated against a physical foil.
Root bending and mast-foot pitch values are static load demands from the lifting surfaces. The tail-arm value is a lever-arm estimate. They are not laminate, joint, fastener, buckling, fatigue or strength calculations.
Drafts and immutable revisions save on this device, separated by signed-in account. Assembly cloud sync is not implemented. Download project JSON to back up all geometry, sources, placements and operating inputs. Import restores that snapshot. Unsupported versions or invalid coordinates are refused.
The Pro CAD download contains one STEP with four named placed solids, the exact project JSON, and a README. Generation is cancelable and runs in a worker. Editing the assembly while a job runs does not change that job's captured snapshot.
Bodies are separate. Overlap does not create a structural joint. Wing seats, connectors, shims, bolt holes at the fuselage, reinforcement and construction clearances are still the builder's responsibility. A detached stabilizer placement is flagged as needing a connector. The mast's existing board mounting geometry is included, with any CAD fallback notes carried into the README.