I think you are correct. Not sure if it was Williams, but it was a turbojet.I think that second video was a Williams jet engine venture (for military).
I would have backed off too. It just struck me as being funny... especially IF the builder was trying to show its safety or control.Seems like the reasonable thing to do.
Jets are pretty (reasonably) efficient at transsonic speed. Putting them at the tip makes a lot of sense. Ramjets are way less efficient at that speed but still make a lot of sense (simple).But besides that, I was wondering what AutoReply, in post # 70, above, meant when he said: "Use a tip-driven (turbojet) prop and you've solved most of the issues..."
Was he referring to the Flying Platform, or or something else, or was his meaning simply lost in translation? It might be interesting to know what idea(s) he might have had that nobody has thought of yet.
=it is polish construction (Adam), with 140 HP bike enginy +motorcycle reductor...already been posted...