Most paper airplanes end the same way: on the floor, sooner than you hoped. That ending tells you almost nothing. The useful information is in the first second after the plane leaves your hand, and the fixes for the common patterns point in opposite directions. Bend the wrong way and you make the problem worse, which is why "throw it harder" so often fails.
Get three throws that match
You can't diagnose a plane you throw differently every time. Stand in the same place, hold the plane in the same spot under the body, and release at shoulder height with the nose level. A smooth push beats a flick of the wrist, which tends to twist the plane sideways.
Throw three times. If the three flights look alike, you have a pattern worth fixing. If they're all different, fix the release first: a draughty room, a squeezed wing, or a nose aimed at the floor will hide whatever the plane is doing.
Before any trim, give the plane one honest inspection. Hold it closed and look at the wings from above: do the outlines match? Look from behind: do the wings rise into the same shallow V? Is a crease springing open? Our plane guides include a view from behind for exactly this check.
| Pattern | Check first | Then try |
|---|---|---|
| Dive: nose down from the release | Your release angle; back edges bent down; a paper clip on the nose | Both back edges up about 1 mm |
| Stall: climbs, slows, drops | An upward throw; back edges bent up too far | Throw level; flatten the bends by half |
| Turn: curves the same way each time | Unequal wings, a twisted body, one bent back edge | Refold or match the wings, then a tiny steering bend |
| Roll: tips onto one wing or flips | Wings drooping, a wing crease opening, a sideways release | Raise both wings into a shallow V; re-press the creases |
A dive: first rule out your hand
A plane released with its nose pointing down will descend steeply even if it's trimmed well. Before touching the paper, throw once with the nose deliberately level, or even slightly up. If the dive goes away, the problem was the release.
If it still dives, bend up the last strip of each wing's back edge, the same amount on both sides. Think one millimetre, about the thickness of a coin, not a visible flap. Throw three more times. Small steps matter because the plane responds a lot to very little paper. Some designs need a little more bend than others; let the three throws tell you, not a fixed number.
A stall: the fix is usually less, not more
A stall looks like a plane that's trying hard: it swoops upward, slows almost to a stop, then drops nose first, sometimes repeating the swoop. The tempting reaction is to add more upward bend "so it climbs". That does the opposite of what you want. Flatten the back-edge bends partway and throw closer to level. A soft, level release is often all a broad-winged glider like the Condor needs.
A turn: fix the shape before you steer
A plane that curves the same way every time almost always has a reason you can see. Hold it up to a window with the wings together. One wing wider than the other, a back corner curled, or a body that's twisted along its length will each steer the plane. Refold the crease or, if the wing is crumpled, fold a fresh plane. It's faster than chasing the turn with trim.
Only when the shape is symmetrical should you steer with trim. For a plane that keeps curving left, bend the right wing's back edge up slightly, or the left one down; reverse that for a right curve. This matches the app's Flight Doctor. Real planes also bank and slip, so check the result with three throws rather than assuming it worked.
A roll: look at the wing angle
Viewed from behind, most of our planes are meant to open into a shallow V, with the wingtips a little higher than the body. Wings that droop below level, or a wing crease that has half opened, make a plane tip onto one side. Re-press the wing creases and lift both wings to the same angle. Planes with drooped tips (the Raven, Gull and Magpie) droop only the tips on purpose; the main wings still rise.
Keep a trim log
On a scrap of paper, write the pattern, the single change, and the next three results. "Dives → both edges up 1 mm → glide, glide, slight dive." It takes seconds and it stops the classic spiral of bends, clips and tape until nobody knows what helped. If a change makes things worse, undo it and try the opposite.
The app's Flight Doctor shows these adjustments on a 3D model you can rotate. Use it to see which edge moves; then check the result on paper, because a simulated plane never has a squashed wing.
Keep going
- Before you foldChoosing paper for a paper airplanePrinter paper is the right place to start. When to switch, what gsm means, why Letter and A4 give different planes, and how to compare two papers fairly.
- Choose a designDart or glider: which paper airplane should you make?Pick a plane by what you want it to do and where you will throw it. How darts and gliders differ, with suggestions from all 44 designs.
- Try an experimentHow to run a fair paper airplane flight testA tape measure, a starting line and ten throws: how to find out whether a change really helped, with a printable log and a worked scoring example.
- Understand flightHow a paper airplane flies without an engineLift, drag, weight and balance in plain language, and how each one shows up in the flights you actually see.
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