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To whom it may concern; (TODAY'S REALITY SENERIO);you board a 747 heading to europe at JFK,you find your seat and stow your carryon's (jacket,hand bagg) and settle in to a semi comfortable chair and mentally prepare for a 10 hour flight.Finally the plane siftery escapes the bounds of earth and climbs to 35,000 feet at a speed of 425 knots (400 mph) for it's long night's travel.Suddenly the plane lurches and the skin exposes a small hole,the oxygen masks shoot out of a panel above your head.The noise is deafing,you find it hard to breath,the temparture has just dropped from a nice 70 degrees to -60 degrees below zero,as your reach for the oxygen mask you notice your fingers are turning blue.You feel a sinus headache comming on as you notice the aircraft starting to dive.Finally after five long minutes the plane levels out and the noise abates as the plane returns to JFK airport. (FUTURE YOUR HYPERJET REALITY SENERIO);you board a HYPERJET TRANSPORT heading to europe at JFK,you find your seat and stow your carryon's (jacket,hand bagg) and settle in to a semi comfortable chair and mentally prepare for a 2 hour flight.Finally the plane siftery escapes the bounds of earth and starts it's climbs to 150,000 feet at a speed of mach 1 (700 mph).Suddenly the plane lurches and the skin exposes a small hole,the hole ripps into a bigger and bigger hole.You try to breath but you can't your lungs are frozen solid,the temparture has just dropped from a nice 70 degrees to -200 degrees,the pressure on your head starts to expand until your head explodes.The hole has grown to a point of catrosphre structural failure and what left of your body is plasma (friction) blasted down to the bone just before the fuel explodes! These worst case senerio's are to draw attension to your article "HYDROGEN HYPER JET" and to the "HOLY GRAIL" promise of econimic hypro-sonic flight!I will all so address your myths about the propullsion,structural design,environent flight envelope pro's and con's as well as "egress (getting the hell out)"! Flight Envelope Enviroment,(subspace vs atmosphere),pro;subspace starts at 100,000 feet and goes up to 100 miles above the surface of the earth,here the atmosphere is 0 to 20% air,so a gallon of gas goes a lot further than at a lower altitude.Hence the desire to fly here now that gas prices are forcing airlines to merger or go out of business.the temperature at 100,000 feet is -150 to -200 degrees atmospheric pressure is a dangerous 4 pounds per square inch,hence the need for a spacesuite or a "G" suite.It is true that the gas usage at this altitude is greatly inhanced,if designed right the craft could literially fly without fuel,surfing the shock wave at mach 3-5 (shockwave compression dynamic)!However in the senerio above I spoke of time usage in an emergency;on a 747 it takes 5 minutes to slow and dive to a breathable atmosphere,a hyperjet at 150,000 feet at mach 5 would take 15 minutes to slow down and reach a breathable atmosphere! Structral craft design ; To attain the optimun design we have to do our history home work,I love the old M-50 design and I noticed that your hyperjet was a dirvetive of it but if you have done your home work you would have understood the design was a flawed design from the get go,bad renyonls numbers,bad pylon root design kept it from reaching supersonic capability!Now if we look at all the supersonic aircraft since WWII you will notice the engine are located close if not under the center of gravity of the craft.The only heavy bomber to reach mach 3 was the XB-70 and proved that "shockwave compression dynamic" was feasible but it was not build to fly past 68,000 feet.The SR-71 gave us vaulable data about sustained flight above 100,000 feet as well as a need to build a better "hybrid engine design" as well as the dangers involved!So what will the hyperjet really look like,I will give you a hint Boeing's X-51"Wave Runner" it has already reached "mach 5+"! Propullsion Design; The only craft to intergrate a turbine and a ramjet was the SR-71 and they had problems from the get go,UNSTARTS (shock wave turbulation in the turbine engine) hence the horrific air dump door design after thought!The fuel was another consideration JP-8 is really thick and not really volitile hence the Sodium/Bromide ingnitors at a cost of $750,000 each.Your idea of hydrogen as the fuel is a good one,on one hand it burns at a lower flash point that JP-4 but it takes twice as much fuel (gas) but liquid hydrogen evaporates at a rate of 100 gallons of gas from 1 gallon of liquid hydrogen!The secret to this engine will be found by "radical turbine blade design" one that will have the turbine blades disappear after mach is acheived.To solve the "unstart problems" and to rework the "dump door problems". Egress Design; The biggest mental problem to the commerical airlines and the flying public is they like window seats,in a way your suggestion of a windowless design is correct.However I believe everybody can have a window seat without windows!The averge person spends an about 6 hours a day watching television of some sort so I suggest window monitor (plasma screens).Next as I suggested in the worst cast senerio,passenger safety,should be formost!So what can be done one might ask?One method might cost more than the plane,suppling spacesuites and armed ejection chairs to 300 passangers,ah not!The other is simular to the interior shown in the movie "THE FIFTH ELEMENT" where passangers lay prone during the flight in a armored/pressurized (blastprof/fireprof/waterprof) compartment complete with window monitor door and hot and cold pockets for food and drink.The habitats are clustered and have parachute/elt/dragbags.This would call for a radical new kind of aircraft design focusing on passanger egress.So what would drive this egress situation?The master stress sensor and program now being developed by beoing for the 787 but modified to work with a supercomputer flying the hyperjet (UCAV),that is why you don't show a cockpit,right! Sincerely Cobrapub@earthlink.net