Concepts

Maneuvering Speed (Va) — Why It Drops as the Aircraft Gets Lighter

Why manoeuvring speed changes with weight, how to use the square-root approximation, and why Va does not protect against every control input. Interactive V-n diagram and worked examples.

Drag Types & the Drag Curve

Induced vs parasite drag, why total drag is U-shaped, and what V_md means for endurance, glide, and holding speed.

How a Wing Generates Lift

Bernoulli AND Newton — both descriptions of lift are correct, both are needed, and the famous "equal transit time" theory taught in school is wrong.

Magnetic Compass Errors — Turning (UNOS) & Acceleration (ANDS) Explained

Why the magnetic compass under-reads on northerly turns and over-reads on southerly turns, and shows a fake turn during a straight-line acceleration. UNOS, ANDS, magnetic dip, liquid swirl — the physics, the mnemonics, and how every pilot fixes it.

5 Types of Altitude in Aviation — Indicated, True, Pressure, Density, Absolute

Five different altitudes for the same aircraft — indicated (altimeter reading), true (above MSL), pressure (above 1013 hPa), density (what the engine feels), absolute (above terrain). Definitions, formulas, ISA deviation, and when each one matters.

IAS, CAS, EAS, TAS, GS — Aviation Airspeed Types Explained

Six different airspeeds for one aircraft — indicated (IAS), calibrated (CAS), equivalent (EAS), true (TAS), ground speed (GS) and Mach. The cascade of corrections, IAS-to-TAS conversion, formulas and when each one matters in flight.

The Coriolis Force

Why air (and aircraft) deflect right of track in the Northern Hemisphere and left in the Southern — the rotating-Earth force behind every wind on the chart.

Lapse Rate, Stability and Cloud Formation

How ELR, DALR and SALR decide whether air sinks, keeps rising, forms layer cloud, or builds into towering cumulus.

METAR — decoding the standard weather report

Eleven groups, in a fixed order, packed into a single line. What every group means, why each character is there, and how to read a METAR end-to-end.

Thunderstorm Life Cycle

The three stages every thunderstorm cell passes through, the hazards each stage produces, and how far you need to stay clear of a CB to be safe.

Holding Pattern Entry — Direct, Parallel, Teardrop (with Diagrams)

How to pick the right holding entry from any inbound heading. Direct, parallel and teardrop entries explained with interactive diagrams, the 70°/110° rule, step-by-step procedures and common mistakes — for ATPL, CPL and instrument-rating prep.

DME Arc Intercept and Tracking

How to intercept a DME arc cleanly, then hold it with the 10-degree heading-bug rule.

The 1-in-60 Rule

The navigator's pocket trigonometry — how many degrees you're off-track, and how many degrees to correct, from distances alone.

VOR Intercept & Reverse Sensing

How to intercept a VOR course cleanly, and why the CDI sometimes deflects the wrong way when the OBS is set to the reciprocal.

Convergency & Conversion Angle — Formula, Examples, Mercator vs Lambert

Understand meridian convergence, rhumb lines and great circles, compare Mercator and Lambert charts, and apply a short-leg conversion-angle approximation with its limits.

Magnetic variation vs deviation — three different norths

True north, magnetic north, and compass north all point to different places. Variation is the angle between the first two; deviation is the angle between the last two; and every flight-plan number is one of these three headings.

V-Speeds & Balanced Field Length

V1, VR, V2, VEF — what each take-off speed actually means and why the balanced field length is the runway distance an airliner is gated by.

CG Position & Its Effects

How a forward vs aft centre of gravity changes stall speed, stability, trim drag, and cruise economy — with a slider that shows the trade-offs.

Pressure & Density Altitude — what the engine actually feels

Field elevation isn't what your engine and wing experience. The QNH offset gives you pressure altitude; the temperature offset on top of that gives density altitude — the input to every take-off and climb performance chart.

VFR Weather Minima (by Airspace Class)

The visibility, cloud-clearance and ceiling limits that let you legally fly VFR — by airspace class and altitude band.