Planform (top view) — nose up

RCS compass — radial axis = dBsm

Diffuse scatter · skin, seams, gaps−25 dBsm
Radar frequency3.0 GHz · λ 10.0 cm

Physical optics of the lit faces only, checked against nTop's traced solver to 0.06 dB. It has no diffuse floor and no edge diffraction, so the far-side lobes the toy draws 6 dB down are absent here.

No trace shown. Both curves above are computed in your browser.

Loud compass
—
% above −5 dBsm
Nose-sector max
—
dBsm, ±30° nose
Spike directions
—
distinct lobes
—
Toy lobe model + diffuse floor Loud threshold −5 dBsm Physical optics — lit faces nTop trace of this preset

This compass is the vertical-polarization (VV) picture: an edge seen perpendicular at grazing returns in VV from either side. In horizontal polarization those grazing edge lobes largely vanish and only vertical faces — fuselage sides, a flat transom — flash.

Presets
13 edges, a dozen orientations; 22 edges but every leading edge on one angle; 6 edges, every TE parallel to an LE; 4 edges, two.
Edge normals
How to read it

Solid arrow: that edge's lit lobe, at its normal.

Small arrow: the far-side lobe, 6 dB down — the edge, not the face.

A flat transom is an edge too: it fires aft and, by the mirror, into the nose.

Drag any vertex; the left half mirrors. Drop the tail on the centreline to close it.

Solve runs real physical optics on the outline. Its curve is a snapshot: edit anything and it clears until you press Solve again.

You cannot delete edge energy — you choose where to send it. Align the edges and the nose sector goes quiet while the surviving lobes get taller.