For people teaching themselves aircraft design.
Somewhere to learn aircraft design by doing it: writing that works through one idea at a time, a course that takes one RC aircraft from the brief to the first flight, and Wing Builder, which runs a real solver in your browser.
The material is free
The aerodynamics posts and the curriculum carry no price, and reading them costs us nothing to serve, so more readers never turns into a reason to start charging for them. The same solver runs inside the posts, which means you check a claim where you read it instead of taking it on trust. If you can describe an aircraft you should be able to analyse one, and neither a degree nor a card should stand in the way of that.
Who builds it
The one building Wingarddy is Jace Kim, and that link is the quickest way to get in touch. The name belonged to a UAV development team before it belonged to this.