RCampbell's comments

RCampbell | 7 years ago | on: Nasa to test ‘quiet’ supersonic flights over Texas

The place where we ended up in that show is that airlines find that time and again, customers will pay for more luxury rather than time... a regular subsonic flight JFK-LHR is a bit over 7 hours, Concorde cut that to 3:15. But does that matter? People like the idea of getting there faster, but when it comes to actually spending money on it, most wouldn't do it.

A one-way trip on Concorde was about $5000, and for that money, you got an old-school business-class seat (they never updated the interior of Concorde), no overhead bins, no internet access, no entertainment system of any kind. For that same money, you get the all-encompassing cocoon of the modern business-class pod on a 787. It may take twice as long, but you don't care because you're comfortable.

Meantime, we're getting closer to manned hypersonic flight, Mach 5+ with combined cycle engines. Considering the development time necessary for a new airliner, especially with experimental technology like new supersonic engines, I think the LockMarts and Boeings of the world are waiting for more of that technology to mature. It would suck to develop a brand new Mach 2 airliner just in time for someone else to build a Mach 5 airliner.

Also, the Mach 5 designs using ramjets would fly high enough (>80,000 feet) that sonic booms are really not an issue. The SR-71 at Mach 3 and 80,000 feet was virtually inaudible.

Much of the experimentation going on around shaping sonic booms is proving contemporary fluid dynamic models that show that you can "customize" your N-Wave and make the kind of boom you want to make.

Interesting times!

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