[renatorgr]

What changes for Renato

A new implement button on Set up AgOpenWeb from your measures (version 1.8): 3.2 m centre-pivot mower conditioner, the trailed mower he uses with the Farmall. This replaces #140.

• Pressing it also presses Case IH Farmall 115C.
• Measured by Renato: on the lower links, its swivel 0.5 m behind the rear axle (between the rear tyres), the wheels 6.5 m behind the swivel, the discs 2 m ahead of the wheels. Still assumed: 10 cm of overlap.
• New field "Swing in the turn (°)" for any trailed implement: a centre-pivot implement swung against its tongue in the turn runs its axle on a wider circle, so the tongue folds less against the tractor. 0 = held straight (what every other button uses).
• Tool offset 0: mowing back and forth, it swings to the uncut side, the other side of the tractor every pass (like the plough).

Results on the Farmall:

	Held straight	Swung 20° in the turn (guessed)
U-Turn radius	9.1 m (the tongue touches a tyre at 54.5°)	6.8 m (6.5 m tongue ÷ sin 75°)
Turn	Keyhole, skip 4	Sagitta, skip 4
Headland	27.9 m (9 passes)	18.6 m (6 passes)
Distance from boundary	2.6 m	2.8 m

How the swing is counted: in a steady turn the axle runs at ra = L sin s + √(rh² − L² cos² s) from the centre (L the tongue, rh the hitch's radius, s the swing), and the step-by-step path swings the implement as far as the tongue folds, up to the field's value, back in line on a straight. A test checks that the path round a circle settles where the formula says (0°, 10°, 20°).

How to test

1. Open the page after the merge (version 1.8 under the title).
2. Press 3.2 m centre-pivot mower conditioner: the Farmall is pressed too, the hitch reads 0.5, the swing 20, the radius 6.8 m.
3. Type 0 in "Swing in the turn": the radius goes to 9.1 m.
4. Press 4 m disc harrow: the swing goes back to 0.

Checks run here: node Firmware/simulator/aow-settings/test.js (all passed), the changelog check, build.py and smoke-test.js ("Simulator pages OK").

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