Everything Don does is like inventing the universe to Raph. He has no idea how his brother does it. Tightening a few bolts here and there, cleaning and oiling things, making simple tweaks to things; that's where Raph's knowledge ends. The rest is just some kind of engineering wizardry far as he's concerned.

Rifling through the stack of papers on Don's desk, he finds the one he's looking for, then plops down on the desk chair, swiveling it around so he can watch what Don's up to.

The design is great, and they've worked pretty hard on it over the consoles, but with new ideas fresh in his mind, he wants to make some changes.

"I think we gotta think some more about makin' this thing more wind-resistant."

And thus faster. Every change he's gonna suggest is gonna have to do with making it go faster.