Thanks for the interest in this topic, but it looks like the true meaning of the name shall be forever left up to speculation.
Yeah, I went back and looked in the Honda Motorcycle Identification Guide. 500-600 look like they are PCs and 650-899 are RCs.
The RC designation for factory racers may actually be Racing Chassis but the only documentation i have refers to production bikes and the VDN. Anybody know?
Some guy (or guys) in Japan makes up the model names. Seriously. How else do you explain something being called "Hayabusa"?
It's some sort of really fast japanese bird, but you already knew that and I'm missing out on some sort of inside joke
Also a WW2 warplane, and a new rocket they're working on. But why name a bike after a bird? Because somebody thought it was a good idea.
I the rocket is old news. I believe they have something currently returning from outerspace by that name.
Obviously I'm not up to speed with Japanese rocket technology. However I have have a daughter who knows how to operate a Patriot missile battery.