Let's start with a chair.
This one cost me £5 on eBay and a return trip to Winsford (but I won't hold it against them).
It's a child's chair, in an effort to match a scaled version of our proof-of-concept. Back home however I note that it's around 15" square as against 18" for the adult seat that I have already, so we're talking a 5/6th scale.
That will be fairly convincing to look at, although it does render the motors and rotors rather smaller than they'd be in reality. Propellers for personal air vehicles range from around three foot in diameter to nearer five, and those we have already are just 22".
That scales them up to only 27" and so somewhat short of the minimum required, yet the idea of a proof-of-concept is literally to prove to people that the design is a flyer.
