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v0.9.39 · 2026-09-23
Standalone aircraft-shaping tool
Bug Splat Tool

Explore planform edge alignment and estimate the aircraft's 360 degree monostatic signature shape for various frequency bands (actual values are notional).

Planform edge shaping

No JET aircraft loaded.

Aircraft Spikes
Fuselage Shielding
Notional RCS “Bug Splat”Edge only - relative measures estimatedUNCLASSIFIEDBlue trace · dBsm radial scale Drag corner handles to reshape · primary spikes: red · reverse spikes: blue
Fuselage conditionDiamondLeft/right mirror symmetry
Number of spikes—Unique primary and reverse spike directions; directions within 3° are combined
θHPBW = 2 sin−1(2λ/L)   ·   σ = 10 log10(L²/π) dBsm
Calculated HPBW: —   ·   Edge σ range: —

The Bugsplat is an edge-only conceptual estimate. It does not model three-dimensional shaping, materials, cavities, diffraction, shadowing, or multiple scattering.

Calculate your Bug Splat from an .STL file

UNDER CONSTRUCTION

Loading a JET JSON or XLSM above automatically creates an STL from the common 3D renderer and solves it here. You can also drop an aircraft outer-mold-line STL to replace it.

Left drag: rotate · Right drag: pan · Wheel: zoom · Double-click: reset
Educational high-frequency approximation. The solver coherently combines radar-visible illuminated-facet physical optics with BVH shadow tests and equivalent currents on silhouette and sharp crease edges. Electrically large facets use adaptive phase sampling. Coordinates are calculated in millimeters and converted to m² before reporting dBsm. Material properties, polarization, cavities, and multiple-bounce interactions remain outside this browser model.

No STL loaded. Geometry remains on this computer.

Logarithmic: 100 MHz to 20 GHz
1 retains every triangle; 20 retains approximately one in twenty
Triangles used—Selected solver mesh
Peak estimate—dBsm
Dynamic range50 dBNormalized to plotted peak

New Solver

A second STL workflow using the exact in-plane physical-optics solver from the referenced Planform Alignment demonstration. The STL is projected to its top-view convex outline before solving.

Left drag: rotate · Right drag: pan · Wheel: zoom · Double-click: reset
Projected-planform solver. This is the referenced 2.5D method: an extruded two-dimensional outline, exact in-plane incidence, coherent facet addition, and one-dimensional segment self-shadowing. It is not an arbitrary three-dimensional STL solver. STL millimeters are converted to meters.

No STL loaded. Geometry remains on this computer.

Logarithmic: 100 MHz to 20 GHz
Outline vertices—Convex top-view projection
Peak estimate—dBsm
Azimuth step0.1°3,600 samples

Planform edge shaping — New RCS compass

Drag any cyan vertex to reshape the outline. Choose one of the original preloaded shapes or load a JET aircraft from JSON, XLSM, or XLSX.

Editable planform · drag cyan vertices

4th-gen fighter preset.

Uses the referenced calibrated slab height at each wavelength
Outline vertices—Editable polygon
Peak estimate—dBsm
Azimuth step0.1°Exact self-shadowing
JET import method. Aircraft surfaces are converted to a top-view convex silhouette in meters. A centerline nose apex is inserted when the first fuselage station has finite width.