Just thought I'd add a relevant link as the phrase "dead downwind" caught my eye https://en.m.wikipedia.org/wiki/Blackbird_(land_yacht)#:~:text=On%20July%202%2

Just thought I'd add a relevant link as the phrase "dead downwind" caught my eye https://en.m.wikipedia.org/wiki/Blackbird_(land_yacht)#:~:text=On%20July%202%2C%202010%2C%20Blackbird,the%20speed%20of%20the%20wind https://en.m.wikipedia.org/wiki/Blackbird_(land_yacht)#:~:te....