sweetpea
100cc
There was a thread about this a few years ago, with many asking the same question.
It takes selling at least 15 planes just to cover the development / prototyping cost.
I made the suggestion at the time to get 10 people to put 20% down payments to make it happen: the thread immediately died....
I was #1 in line to put 50% down for 100cc version! And that still stands!