Talk:Shuttle Carrier Aircraft

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[edit] Weight

I'm not an aeronautical engineer, but it seems to me that the shuttle's weight would alone would counteract some of the lift generated by the SCA's flight, so that even if it added no drag, more of the plane's energy would have to go into keeping itself aloft instead of moving forward. The article I linked to (which isn't written by an aeronautical engineer, either) also says the weight is significant. Could you explain why you removed it? Thanks, Dave (talk) 16:20, August 10, 2005 (UTC)

I'd just had a quick discussion on sci.space.shuttle where I was told off for assuming it was weight not drag :-). Basically, the loaded weight of the Orbiter is about the same as the cargo+passengers weight on a normal 747, so the weight of the SCA plus Orbiter is about the same as the weight of a 747 taking off on a normal passenger flight. [1], which is written by an aeronautical engineer ;-)

As such, just lugging the Orbiter (and ignoring drag) would require no more fuel than flying normally, so in theory the SCA would have the same range... but it doesn't, and the difference is almost entirely due to drag (weight to a small degree, but also things like flying inefficiently). Shimgray 16:55, 10 August 2005 (UTC)

That makes sense, although it's hard to imagine the shuttle plus stabilizers etc. weighing less than three times as much as passengers, seats, and cargo. Maybe we should clarify in case it confuses someone else. Thanks for the quick response. Dave (talk) 16:57, August 10, 2005 (UTC)

Bear in mind that the SCAs have been gutted inside - they're missing all the seats, cabin furniture, and so forth. That weighs quite a bit. [2] quotes a quarter-million lbs of payload (presumably for a cargo variant), whereas the orbiter is about 240,000 lbs at takeoff (presumably similar or a little less on being ferried, as fuel and payload are missing, but tailcone &c added). So the numbers are pretty similar. Shimgray 17:06, 10 August 2005 (UTC)

I agree it's probably worth noting something about the payload issues ("weight no problem", basically), but I'm not best sure how to do it. Hmm. Shimgray 17:11, 10 August 2005 (UTC)

[edit] Fuel stats

Something looked odd with the fuel stats, so I looked up some of the info. There should be an infobox for this, but I didn't see it.

Range 1000 nautical miles [3], = 1152 mi = 1852 km
Fuel capacity of standard 747-100, 183,380 liters Boeing_747#Technical_data = 48,440 gal
Length of standard 747-100, 70.7 m Boeing_747#Technical_data, = 232 ft

This gives fuel stats of 99 L/km and .0238 mile/gal. However, .0238 mpg is 125 ft/gal, about than half the plane length. Thus, the "1.5 times the length of the plane" part is not consistent with the other units. [4] Gimmetrow 23:55, 4 July 2006 (UTC)

[edit] Black Side Down

I know it seems somewhat silly, but it does seem to be a real joke - different reports give different wording (Attatch/Place/Mount Orbiter Here...), but photos certainly exist and have turned up in reputable works - I don't have my copy to hand, but some poking suggests, there's one in Dennis Jenkins' book.

[5] is another picture - note different style and wording. I suspect the joke has been recreated a couple of different times, possibly on different bits of hardware. Shimgray | talk | 19:29, 14 November 2006 (UTC)

Yea, the Black Side Down part probably is a joke. The rest could just be overcautious warnings and such. The Place Orbiter Here image above is too small for me to read the lettering. -Fnlayson 05:50, 15 November 2006 (UTC)