A plane that lands quickly does not always need a harder throw. It might be diving, stalling, rolling, or meeting a gust. Those problems can look similar at the end of a flight but need different adjustments. Watch the first part of the path and the attitude of the wings before deciding what to change.
Start with a repeatable baseline
Choose a calm, clear space. Check that both wings are the same size, the body is closed, and the creases hold their shape. Make three throws from the same height with a similar release. If each flight does something different, work on the release or move away from drafts before trimming the plane.
| Flight pattern | Check first | Small change to try |
|---|---|---|
| Points down and descends immediately | Downturned rear edges, extra nose weight, downward release | Remove an added nose clip; bend both rear edges up slightly |
| Climbs, slows, then drops | Upward release or too much upward rear-edge bend | Throw nearer level and flatten the rear edges a little |
| Turns the same way repeatedly | Unequal wings, twisted body, uneven rear-edge bends | Restore symmetry before adding a steering bend |
| Rolls or flips | Drooping wings, a wing crease opening, or a strong sideways release | Raise both wings into a shallow upward V and firm up the creases |
A dive: ask whether it ever had a chance to glide
If the nose points down from the moment you release it, check your wrist position first. A downward release can hide an otherwise good glide. On the next throw, keep the nose near level. If the same dive remains, remove any extra nose weight and try a small upward bend along the back edge of each wing.
Make the bend shallow and equal on both sides. Start with roughly a millimeter of deflection on a small rear-edge strip, then test again. The right adjustment depends on the design and paper; a fixed bend is not a universal setting. Stop increasing it if the plane begins climbing and dropping.
A stall: more upward trim is usually the wrong direction
A recognizable stall begins with a climb or nose-up attitude, followed by a loss of speed and a drop. Try a softer, more level release. If the rear edges are strongly curled upward, flatten them partway. Test that change before adding weight. A small nose clip can change balance, but it also changes the plane's total weight and may conceal a folding problem.
A turn: correct shape before you steer
View the plane from the nose and then from above. Does one wing sit higher? Is one wing wider? Is a back corner curled? Put the wings together and compare the outlines. A plane with one damaged wing may need to be refolded from fresh paper.
After symmetry is restored, use very small changes to test steering. In the app's Flight Doctor, a persistent left curve is countered by raising the right rear edge slightly or lowering the left one; the opposite applies to a right curve. Real planes can also bank and twist, so observe the result rather than assuming the adjustment worked.
Keep a trim log
Write down the symptom, the single change you made, and the next three results. If a change makes the pattern worse, undo it. A log prevents the common trap of adding several bends, clips, and tape strips until you no longer know what helped.
Use Flight Doctor in the app to see the adjustment on a 3D plane. Then try it on your real sheet of paper. The simulation is an explanation tool, not a guarantee that every hand-folded plane will follow the identical path.
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