About this app
This is an interactive teaching tool for EASA ATPL Principles of Flight (081) and Aeroplane Performance (032). It was built to be the centrepiece of a ground-school classroom, and to work equally well for a student reviewing at home or anyone simply curious about how aeroplanes fly.
Physics fidelity
Every curve, marker and number you see is computed from the governing equations by a shared physics library. There are no decorative curves and no values typed in to look plausible. The library computes in SI and converts to aviation units only at the moment of display, and it is unit-tested against hand calculations and standard reference values — the ICAO Standard Atmosphere table, the parabolic-polar relationships, the stall-speed identities.
Where a lesson uses a pedagogically standard simplification — the linear lift-curve slope, the parabolic drag polar, Wieselsberger’s ground-effect factor — it says so on the page, in an “About this model” note. A teaching tool that quietly overstates its own precision is not being honest with the class.
What it does not do
There is no assessment of any kind. No quizzes, no exam mode, no scoring — not now and not later. Question banks exist and are good at their job; this app teaches, and leaves testing to them.
An account is needed to open the lessons, and a subscription keeps them open. Beyond the email address you sign up with, nothing is tracked: no analytics, no advertising, no third-party scripts. Figure settings survive a jump into presentation mode and back by living in the browser tab’s session storage, and they are gone when the tab closes.
Presentation mode
Every lesson has a /present route, and it is a slide deck rather than the lesson scrolled larger: one screen per stop, nothing to scroll, full screen, enlarged controls and large hit targets, driven from the keyboard or a clicker. What it puts on the wall is the charts — a title, then each figure and each table of numbers, in the order they are written. The deck is derived from the lesson itself, so it cannot fall out of step with what it presents.
Left and right step; up and down adjust the figure’s main control, which takes the keyboard as soon as its slide appears;T shows the figure’s summary as a talking line;F is full screen. The prose, the headings, the equations and the worked examples stay in the lesson — a room reading the screen is not listening to the person at the front.
Status
Subsonic aerodynamics is being written first, and the rest of the syllabus tree is already visible so the intended coverage is clear. Sub-chapter numbering in the tree is provisional pending confirmation against a specific ED Decision.
A necessary caveat
This is a teaching aid, not an approved training course and not an operational document. Nothing here replaces an ATO’s syllabus, an aircraft flight manual or an operator’s procedures.