The reappearing sheet asking me to subscribe to some newsletter is incredibly annoying. And it seems that it sometimes refreshes the website when I close it?

Who of the first time visitors would even want to subscribe to such a thing before seeing pretty much any content? Does it have a reasonable conversion?

The planes seem cool though!

Before my website was posted here, most traffic came from viewers of my YouTube channel, so the website homepage isn't their first interaction with Foldable Flight content. That's why I've had the newsletter popup there. Perhaps it's too disruptive to the user experience, though it does have a good conversion rate.

Thanks!

1. The chord length of the plane's wings (their length from front to back) needs to be similar to the length of the PowerUp unit, but shorter.

2. The surface area of the plane's wings needs to be great enough that the wings generate sufficient lift to compensate for the added weight of the PowerUp unit. The PowerUp 4.0 (the remote controlled version) generates more thrust than the PowerUp 2.0 and works with more paper airplanes as a result.

It is possible to design planes that work with the PowerUp units, but do not work on their own. That said, my primary interest is in designing paper airplanes that fly without the need for the PowerUp units, so all of my designs fly on their own. The only exception to this rule is Hammerhead — a plane I designed specifically for The PowerUp Paper Airplane Book, which contains 10 planes designed to work with the PowerUp units.

His box of kept planes: https://imgur.com/a/2HW8tC2