FS Rules Quiz Quick Start

This page shows how to use Everything Aero to solve typical
FS Rules Quiz problems quickly and reliably.

If the problem can be solved with equations, this tool can usually solve it with minimal setup.

Mental Model (Read This First)

Everything Aero is not a step-by-step calculator.

You do not:

  • choose formulas manually

  • decide calculation order

  • worry about solving intermediate variables

You only:

  1. Write down what the problem gives you

  2. Add any explicit assumptions

  3. Tell the solver what you want to find

The solver figures out the rest.

Every Symbol Must Have an Index

Every variable must have an index.

Correct:

v0 = 30
rho0 = 1.225

Wrong:

v = 30
rho = 1.225

If the problem describes only one condition, always use index 0.

Typical FS-Quiz Workflow

Step 1: Write down given values

Copy everything the problem gives you numerically into Equations.

Example:

v0 = 30
rho0 = 1.225
C_L0 = -3.0
A0 = 1.2
m0 = 280

Step 2: Add stated assumptions

If the problem says things like:

  • “assume no lateral load transfer”

  • “neglect drag”

  • “ignore aerodynamic moments”

Input them in Assumptions.

Example:

W_lat0 = 0

Assumptions are treated as soft constraints and can be relaxed if needed.

Step 3: Ask the question (optional)

Put exactly what the question asks for into Looking For.

Examples:

Re0
F_z_total_cornering_fl
v1

This tells the solver:

  • what to highlight

  • what to prioritize if equations conflict

Example 1: Reynolds Number

Problem
A car drives at 30 m/s.
Characteristic length is 0.3 m.
Air density is 1.225 kg/m³.
Dynamic viscosity is 1.8e-5 Pa·s.
Find the Reynolds number.

Equations

v0 = 30
L0 = 0.3
rho0 = 1.225
eta0 = 1.8e-5

Looking for

Re0

Output

\(Re_0 = 612500.0\)

Example 2: Wind Tunnel Scaling

Problem
A 50% scale model must match Reynolds number of the full car.
Air properties are identical.
Full-scale speed is 30 m/s.
Find tunnel speed.

Equations

Re0 = Re1
L0 = 1.0
L1 = 0.5
v0 = 30
rho0 = rho1
eta0 = eta1

Looking for

v1

Output

\(v_1 = 60.0\)

Final Advice

If you’re unsure:

  • Put everything in Equations

  • Put stated assumptions in Assumptions

  • Put the question in Looking for

Let the solver do the rest.