Originally Posted by
206 jock
Anyway, good to know that the Allison 250 engine had an original (not achieved ) development budget of $6.4m. In the 1950s.
https://verticalmag.com/features/the...enginethatdid/. Given inflation that's $63.2m in today's money. Just for the engine, that didn't work as originally designed.
Everything costs money when you start from scratch. This isn't that. There are now hundreds of small gas turbine engines available to draw inspiration from, along with modern CAD techniques, improved metallurgy etc. Like Everything else it should get cheaper every year. Add the word "uncertified" and what Hill are trying to achieve suddenly becomes quite realistic.