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Thread: capsule travelling at 1000kph in 1/6th of mars atmosphere? Heat?

  1. #1 capsule travelling at 1000kph in 1/6th of mars atmosphere? Heat? 
    Forum Cosmic Wizard icewendigo's Avatar
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    . this post can be erased

    (apparently water cooling is for the compressed air intake of the pod, not the pod vs external friction, since the whole point is to have as little of is as possible/required to have air bearings)


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    Genius Duck Moderator Dywyddyr's Avatar
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    Quote Originally Posted by icewendigo View Post
    To a layman like me it sounds like 1000 km/h is less than jet fighters speed
    While it may be less than their listed possible top speed it's typical of speeds normally flown at.
    As an example the Concorde has more time at supersonic speed than all other aircraft put together 1, which gives you some idea of how often fighters fly really fast.

    but do jet fighters get that hot that the heat is a problem that needs cooling system for the pilot?
    As noted above they tend not to fly very fast for very long, but of those that do (e.g. SR-71) then yes, an environmental system is necessary. (And also, as an example, from memory the engine intake cones reach ~550 degrees C due purely to aerodynamic heating).
    High speed aircraft use different metals (e.g. stainless steel/ titanium) than do ones designed for more sedate usage, simply because aerodynamic heating seriously affects the fatigue life of the metals in use.

    Im thinking of space capsule/shuttle atmospheric re-entry, and that sounds like its much much faster than below the speed of sound?
    I'm not sure what the maximum speed achieved is, but I do recall one of the shuttle missions where a crew member announced that he was taking manual control of the craft - at 250,000 feet and Mach 25. Probably a world record for highest and fastest piloted "flight".

    Or is the heat, a build up as many pods pass on a continual basis?
    Depending on structure and cooling systems heat AND scheduling could build up.
    It would also depend on how long the vehicle spent at at that speed.
    Er, and the aerodynamics of the design, how quickly the boundary layer builds up, how much alleviating mass flow is "designed in" to reduce stagnation temperature...

    1 Oh yeah, and it was supercruising 2 while doing so - one in the eye for the F-22.
    2 Nor was Concorde the first aircraft to do so - the EE Lightning was also supercruise capable - but for much shorter times, mainly due to its abysmal fuel capacity.

    ETA: I really should type faster!


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