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Just thought of something interesting.


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10 hours ago, p1t1o said:

I've always wondered what it would be like if they fitted the shuttle cargobay with LOx/LH2 tanks and fired up the engines on the runway to see what that baby can do!

I think it would run out of propellants before reaching the end of the runway...

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On 2/29/2016 at 11:26 PM, StrandedonEarth said:

I think it would run out of propellants before reaching the end of the runway...

Probably, but how fast would we be going?

On 3/1/2016 at 2:15 AM, Whizzkid said:

Not to mention the angled thrust.

The gimbals could take care of this.

Edited by p1t1o
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On 29/2/2016 at 1:59 PM, p1t1o said:

I've always wondered what it would be like if they fitted the shuttle cargobay with LOx/LH2 tanks and fired up the engines on the runway to see what that baby can do!

 

On 29/2/2016 at 0:26 AM, StrandedonEarth said:

 

I think it would run out of propellants before reaching the end of the runway...

Well, apparently the cargo bay is 4.6 x 18m (I'll assume that means 4.6 x 4.6 x 18m), so it has a volume of 380000 L. Going by the capacity and volume of the external tank which is about 553000L of LOX + 1500000 L LH2, with masses of 629000kg and 106000kg, the combined 'density' of LH2 and LOX propellent in the correct ratio is about 0.36 kg/L, so lets say you could get about 133000kg of propellent in the cargo bay. according to this http://bado-shanai.net/Speculative%20Engineering/SESpShMainEngine.htm the ssme uses 466.3 kg/s of propellent, so with three engines firing it would burn for about 95 seconds. Apparently according to this http://www.braeunig.us/space/specs/orbiter.htm the dry mass of the obiter is 84t (lighter than I thought...) so this would give a delta v of about 4200m/s, and a starting thrust to weight ratio of about 2.94 ... so actually I reckon it would get well beyond the end of the runway, even with these approximate numbers...

 

That being said, I seriously doubt it would be structurally capable of holding 133t of propellent in the cargo bay!

Edited by jf0
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