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Pondlife
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FreeMan
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This photo of the XB-70 Valkyrie's main gear shows a small wheel between the two main wheels:

http://airpigz.com/storage/2012-january/XB-70-Main-Gear-Leg.jpg?__SQUARESPACE_CACHEVERSION=1327853715223 http://airpigz.com/storage/2012-january/XB-70-Main-Gear-Leg.jpg?__SQUARESPACE_CACHEVERSION=1327853715223XB-70 MLG
Courtsey of AirPigz.com

This smaller wheel doesn't touch the ground, though I can see where it might as the side walls of the main tires compress under landing weight.

The AirPigz site promised an explanation, but none has been forthcoming (in the 4+ years since that was posted), and I couldn't find any information on it on Wikipedia, either. Does anyone have any information (real or speculative) on what it's for?

This photo of the XB-70 Valkyrie's main gear shows a small wheel between the two main wheels:

http://airpigz.com/storage/2012-january/XB-70-Main-Gear-Leg.jpg?__SQUARESPACE_CACHEVERSION=1327853715223 http://airpigz.com/storage/2012-january/XB-70-Main-Gear-Leg.jpg?__SQUARESPACE_CACHEVERSION=1327853715223
Courtsey of AirPigz.com

This smaller wheel doesn't touch the ground, though I can see where it might as the side walls of the main tires compress under landing weight.

The AirPigz site promised an explanation, but none has been forthcoming (in the 4+ years since that was posted), and I couldn't find any information on it on Wikipedia, either. Does anyone have any information (real or speculative) on what it's for?

This photo of the XB-70 Valkyrie's main gear shows a small wheel between the two main wheels:

XB-70 MLG
Courtsey of AirPigz.com

This smaller wheel doesn't touch the ground, though I can see where it might as the side walls of the main tires compress under landing weight.

The AirPigz site promised an explanation, but none has been forthcoming (in the 4+ years since that was posted), and I couldn't find any information on it on Wikipedia, either. Does anyone have any information (real or speculative) on what it's for?

Tweeted twitter.com/StackAviation/status/724739660216434688
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FreeMan
FreeMan
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What is the purpose of the extra wheel on the XB-70 main gear?

This photo of the XB-70 Valkyrie's main gear shows a small wheel between the two main wheels:

http://airpigz.com/storage/2012-january/XB-70-Main-Gear-Leg.jpg?__SQUARESPACE_CACHEVERSION=1327853715223 http://airpigz.com/storage/2012-january/XB-70-Main-Gear-Leg.jpg?__SQUARESPACE_CACHEVERSION=1327853715223
Courtsey of AirPigz.com

This smaller wheel doesn't touch the ground, though I can see where it might as the side walls of the main tires compress under landing weight.

The AirPigz site promised an explanation, but none has been forthcoming (in the 4+ years since that was posted), and I couldn't find any information on it on Wikipedia, either. Does anyone have any information (real or speculative) on what it's for?