747-600X
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Posts: 2503
Joined: Wed Jan 05, 2000 3:11 am

747s And 707s Have Same Wheels (! /?)

Thu Feb 10, 2000 5:15 am

I heard that someone got an award for designing the 747's wheel arrangement, since no one had ever done anything on that scale before. I also heard that the 747s wheels are the same as those on the 707. 2 questions: If this is true, are the trucks the same as well? Who designed the 747's wheels, and what do you reckon he puts on his passport, "Landing Gear Designer"?

Thanks for any insights!!
 
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asqx
Posts: 625
Joined: Tue Jun 15, 1999 4:56 pm

RE: 747s And 707s Have Same Wheels (! /?)

Thu Feb 10, 2000 5:51 am

The 747 landing gear was desgined to have the same pressure footprint as the 707. What this means is that each tire puts the same amount of pressure on the runway surface per square inch as on the 707. That way any runway that could withstand the 707 and not crack could support the 747 without being thickened.

I think the tires are the same, or pretty close, but the trucks are different becuase although the tires support the same load, the trucks have a much greater load to carry.

The guy who designed them probably put aerospace engineer on his passport.

Regards,
ASQX
 
LH423
Posts: 5903
Joined: Sun Jul 11, 1999 6:27 am

RE: 747s And 707s Have Same Wheels (! /?)

Thu Feb 10, 2000 10:06 am

I believe they are the same bogies, to keep similar commonality, especially when most of the initial customers for the 747 were already 707 customers, ie PanAm, TWA, American, BOAC, etc.

LH423
« On ne voit bien qu'avec le cœur. L'essentiel est invisible pour les yeux » Antoine de Saint-Exupéry
 
hmmmm...
Posts: 1962
Joined: Tue May 18, 1999 8:32 am

RE: 747s And 707s Have Same Wheels (! /?)

Thu Feb 10, 2000 11:26 am

Hmmmm... . I understand the 747-400 to have about 3+ x the MGTOW of a 707 which is really just a slightly longer 727. And the 707 has 8 rear wheels. The 747 has only twice that number, 16 rear wheels. That would mean that it has twice the number of tires to support 3 x the load. Then the pressure per sq. inch could not be the same. It would be greater. What am I missing?

Hmmmm...
An optimist robs himself of the joy of being pleasantly surprised
 
VC-10
Posts: 3549
Joined: Tue Oct 26, 1999 11:34 am

RE: 747s And 707s Have Same Wheels (! /?)

Sun Feb 13, 2000 6:54 am

The -100 wheels are the same. -200 & on are bigger.
 
JetRanger2000
Posts: 227
Joined: Sun Feb 13, 2000 8:21 am

RE: 747s And 707s Have Same Wheels (! /?)

Sun Feb 13, 2000 8:38 am

The Wings on the 747 are also modified 707 wings

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