Thanks for the link but it wasn't the one I was thinking of !
I don't remember anythink but radial engines on the site - no jets - starting with a "simple" one with "only" few cylinders in one "star" and then advancing to this fantastic project:
The first page on the web-site was a picture of a on-going projekt with - as I remember - 8 or 10 "stars" on the same cranck each with 8 or 10 cylinders - an fantastic project !