APEXWERK

DRIVING PHYSICS · TERM 08 · CLASS OF TWELVE

Grip is a budget.
Spend it with intent.

APEXWERK turns the skidpad into a classroom. No stopwatch worship. No folklore. Just four hand-sized patches of rubber, a moving mass, and the discipline to ask exactly where the load went.

Begin with the corner
PAD / HALDEN NORTHSURFACE / 31°CAVAILABLE μ / 0.98
LECTURE 01
Fx2 + Fy2 ≤ (μN)2

Ask one tire for everything at once
and it will answer by sliding.

SCROLL TO APPLY BRAKE ↓

01 / THE ENVELOPE

The circle is not a limit. It is a conversation.

One tire.
Two jobs.

Braking consumes longitudinal grip. Steering consumes lateral grip. Their combined demand is the moving dot beside you. Drive it toward the rim: the line turns orange, the tire begins to sing, and you have found useful slip—not panic, but information.

0.00–0.59 GRESERVE

Quiet hands, unused capacity.

0.60–0.96 GWORKING SLIP

The carcass talks. Listen here.

> 0.96 GBREAKAWAY

Demand exceeds the available μ.

“Fast is not heroic. Fast is a thousand small, correct transfers.”— Dr. Mara Venn, Chief Instructor
02 / RACING-LINE PRACTICUM

BEND 04 · THE CALIPER · RADIUS 42 M

Move the apex.
The corner answers.

Drag the orange chalk puck across the corner. A later apex postpones rotation and straightens the exit; an early one steals radius exactly when acceleration wants it back.

Interactive racing-line editor Drag the orange apex point horizontally to compare an early, geometric, or late racing line through a right-hand corner. BRAKEOPEN THROTTLE
← DRAG ANYWHERE →62% APEX
LINE CLASSIFICATIONLATE APEXcalm entry / greedy exit
Projected delta
−0.18 s
Minimum radius
47.2 m
Exit speed
112 km/h
Peak lateral
0.88 g
Exit steering
11.4°
PROF. VENN:

Patient rotation buys a straighter steering wheel at throttle pick-up. This is the line for a corner that opens onto a long straight.

03 / TWO FABLES OF YAW

When the car
disagrees.

Same corner, same entry speed. Choose what the startled driver does next. The car’s reply is drawn in chalk.

FABLE A

The Plough

UNDERSTEER
front tires saturated · requested path ≠ actual path

Choose a response. The chalk remembers.

FABLE B

The Pendulum

OVERSTEER
rear slip rises · yaw rate > steering request

Choose a response. The chalk remembers.

04 / CONTACT-PATCH CENSUS

Four hands
hold the road.

A tire touches the ground across roughly the area of a postcard. Pull the brake lever and watch load migrate forward: total weight is unchanged, but opportunity moves.

TEACHING CAR / CW-061,184KG · STATIC 47:53
FRONT LOAD 47%

At rest, the rear axle carries the greater share. The platform is settled; every patch has room to negotiate.

ΔW = m · a · h / wheelbase
05 / TRANSFER, NOT MAGIC

Slow hands make fast platforms.

Settle the
see-saw.

The chassis is a lever floating above four contact patches. How quickly you move the controls matters as much as how far. Try a gentle squeeze; then snap the lever and watch the platform pitch.

REARCGFRONT
NORMAL FORCE ↑

FIELD EXAM / YOUR GRIP SIGNATURE

The lap
you drew.

The blackboard has remembered your combined demand since the first lecture. Scroll and sweep the cursor: a calm ring means measured tradeoffs; a spike beyond μ is where intent outran grip.

000CHALK SAMPLES 0.0 STIME ON RIM 00BREAKAWAYS
Your recorded grip trace A live chalk path made from your steering pointer movements and scrolling acceleration.

μ = 0.98 LAST 180 INPUTS / CODE-DRAWN LIVE

NEXT COHORT17–19 OCTDrypad · 12 seats · Halden Aerodrome
FIELD NOTE 31THE QUIET LAPArrive curious. Leave with slower hands.
READ THE BUILD GUIDE