Drag the arrow's tip to adjust it, then fold.

Start from a design

Balance—

Best glide—

Test throw—

Your folds, in order

Add a fold

Or drag the paper on the table for any fold you like. Move folds up and down the list, tune them with their sliders, or delete them: the sheet is folded again from scratch every time, and the model beside it follows.

Folds0

Thickest1

Length—

Balance point—

Wing fold Wide wingsDeep keel

Elevator Trailing edge downUp

Paper clips on the nose NoneThree

Balance

Tail-heavyBalancedNose-heavy

Wingspan

Wing area

Aspect ratio

Weight

Best glide, in still air