JFTR, Here is Origami Editor 3D[0] — open-source virtual paper folding application, which I used to recreate some of those paper airplanes.

Binary builds[1] and user guide [2] hosted on SourceForge.

[0] https://github.com/bagyoni/origamieditor3d

[1] http://sourceforge.net/projects/origamieditor3d/files/

[2] http://origamieditor3d.sourceforge.net/userguide/en/index.ht...

This paper helicopter was my favorite as a kid. I used to fold hundreds of them and throw them all at once off tall objects.

http://www.paperairplanes.co.uk/heliplan.php#instructions

I remember that from the classic "Great International Paper Airplane Book". Seems it is on them cover even:

https://www.amazon.com/dp/0671211293?tag=duckduckgo-osx-20&l...

The 70's truly were a creative decade....

A seemingly related book is on archive.org, the helicopter appears to be on page 38:

https://archive.org/details/The_Great_International_Paper_Ai...

When your own side project shows up on HN, you know it’s going to be a good day. Happy to answer any questions about foldnfly.

Wish "The Basic" was not there at all. If anything, this is an "anti-pattern" :-)

https://www.foldnfly.com/0.html#The-Basic

What's funny about those is they are harder (in the sense that there's nothing to line up in the wings) than the 'Basic Dart'[1]. As a child I never saw anything but the 'Dart' version, I assume because it's so much better, in terms of flying characteristics.

1: https://www.foldnfly.com/1.html#Basic-Dart

This is awesome. Guess I know what I’m doing with my nephew this weekend.

What a lovely page!