sleekjet
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Ridiculous But Interesting Hypothetical

Sat Jan 28, 2006 5:35 am

Suppose you wanted a 4000-foot sprint for aircraft. No rotating. You're disqualified if your wheels leave the runway. Standing start.

Lane 1 - 757 with RR engines

Lane 2 - 727

Lane 3 - DC-10

Lane 4 - Embraer 175

Lane 5 - Saab 300

Lane 6 - Airbus 310

Lane 7 - Airbus 340

Lane 8 - 747

Who breaks the tape first?
II Cor. 4:17-18
 
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Francoflier
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RE: Ridiculous But Interesting Hypothetical

Sat Jan 28, 2006 5:53 am

Saab 300 = Saab 340??
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Starlionblue
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RE: Ridiculous But Interesting Hypothetical

Sat Jan 28, 2006 6:15 am

SAAB 340 followed by the Embraer. At that distance inertia is a big factor.

But that's just a guess.

BTW a SAAB 900 (car) could well make it there faster. Big grin
"There are no stupid questions, but there are a lot of inquisitive idiots." - John Ringo
 
Slovacek747
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RE: Ridiculous But Interesting Hypothetical

Sat Jan 28, 2006 6:25 am

Uhh.. would they have a full payload??? or just enough fuel to make it the 4000'???

Slovacek747
 
Newark777
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RE: Ridiculous But Interesting Hypothetical

Sat Jan 28, 2006 6:40 am

I remember they had a race between a sports car and an F-16 on Ripley's once. The car was winning eventually, but once the F-16 picked up some speed, the car was toast.

Harry
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corey07850
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RE: Ridiculous But Interesting Hypothetical

Sat Jan 28, 2006 6:56 am

Essentially all you would need to do is compare the power to weight ratio of each of the aircraft. To be fair, make sure you either use the Max or Min weight of each plane.

I would tend to lean toward the Embraer, but that's just a complete guess.
 
bohica
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RE: Ridiculous But Interesting Hypothetical

Sat Jan 28, 2006 7:44 am

Just my guess:

Lane 1 - 757 with RR engines - Disqualified. It would get airborne.

Lane 2 - 727 - 2nd.

Lane 3 - DC-10 - 4th.

Lane 4 - Embraer 175 - 1st.

Lane 5 - Saab 300 - 6th. (I think you meant Saab 340.)

Lane 6 - Airbus 310 - 3rd.

Lane 7 - Airbus 340 - Last, if it is a 200 or 300 series.

Lane 8 - 747 - 5th.

The 757 would win if it could stay on the ground.  Smile
 
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Starlionblue
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RE: Ridiculous But Interesting Hypothetical

Sat Jan 28, 2006 7:50 am

Quoting Corey07850 (Reply 5):
Essentially all you would need to do is compare the power to weight ratio of each of the aircraft.

This would give a very rough approximation, since the standstill thrust of various engines differs greatly from what they get with air screaming into the engine. At standstill, props probably have an engine.

Another factor is if the aircraft has engines at idle or full blast when you start measuring. If they are at idle, the faster spoolup of the prop would give it another edge.
"There are no stupid questions, but there are a lot of inquisitive idiots." - John Ringo
 
aogdesk
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RE: Ridiculous But Interesting Hypothetical

Sat Jan 28, 2006 8:49 am

I'll put $100 on the Embraer. Anyone want to jump in on that action?
 
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Starlionblue
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RE: Ridiculous But Interesting Hypothetical

Sat Jan 28, 2006 8:51 am

Quoting Aogdesk (Reply 8):
I'll put $100 on the Embraer. Anyone want to jump in on that action?

If you can line up the planes, sure Big grin
"There are no stupid questions, but there are a lot of inquisitive idiots." - John Ringo
 
jamesbuk
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RE: Ridiculous But Interesting Hypothetical

Sat Jan 28, 2006 9:01 am

Hi guys and gals

The 757 easily if it could be kept on the ground!!

Rgds --James--
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wing
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RE: Ridiculous But Interesting Hypothetical

Sat Jan 28, 2006 9:33 am

If any of you not picking the A-310 is not knowing enough of the power of that beast.That plane is just ridiculisly overpowered which none of the pilots world wide can complain but unfortunately menagements does.
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Mastropiero
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RE: Ridiculous But Interesting Hypothetical

Sun Jan 29, 2006 12:03 am

Is interesting you mention the fact that the 757 couldn´t be kept on the ground. I don´t get it, does it mean that it´s wings would generate so much lift at the speed it would reach that it would start to rotate without any input from the pilot? Even on a clean wing configuration? If so, why is it only for the 757 and not the rest of the planes?
 
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Starlionblue
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RE: Ridiculous But Interesting Hypothetical

Sun Jan 29, 2006 1:54 am

Quoting Mastropiero (Reply 12):
Is interesting you mention the fact that the 757 couldn´t be kept on the ground. I don´t get it, does it mean that it´s wings would generate so much lift at the speed it would reach that it would start to rotate without any input from the pilot? Even on a clean wing configuration? If so, why is it only for the 757 and not the rest of the planes?

Yes the plane would lift off. But it would not rotate unless it was badly trimmed. And this would be a problem for the SAAB 340 way before the 757.
"There are no stupid questions, but there are a lot of inquisitive idiots." - John Ringo
 
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HAWK21M
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RE: Ridiculous But Interesting Hypothetical

Sun Jan 29, 2006 6:23 pm

I would say the 757s with RB211 Engines.The Nose can be held on the ground.
regds
MEL
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Jetlagged
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RE: Ridiculous But Interesting Hypothetical

Sun Jan 29, 2006 7:05 pm

Based on thrust to weight ratio at operating empty weight, the order would be:

1. 757 (T/W = 0.682)
2. A310 (0.659)
3. Embraer 175 (0.63)
4. 747 (0.62)
5. DC10 (0.598)
6. 727 (0.52)
7. A340 (0.468)

The first three would be very close with the 747 and DC-10 not far behind. The 727 is a disappointing 6th, with the A340 not surprisingly last.

I'm going to disqualify the "SAAB 300" on the grounds that (a) it doesn't exist and (b) the maths for turboprops is not so easy. Anyway, although props feel sportier, they lose thrust with forward speed faster than jets so couldn't really compete. Also it would have the hardest time staying on the ground.

I'm surprised by how low the 727 comes, but not by the 757 winning. Not only the highest thrust to weight ratio, but also one of the slipperiest in drag terms too.

Interestingly, if the 777-200LR were to enter it might just beat the 757 (thrust to weight ratio 0.6875, but more drag).
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