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Concorde had engines directly attached to the wings, close to the fuel tanks. Some fuel was evaporated due to heat. What were the reasons to not use pylons or some cooling system to limit this effect?

Concorde

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    $\begingroup$ What exactly do you mean by "struts" here? Do you have a link or picture? $\endgroup$ – Pondlife Jul 22 '15 at 17:53
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    $\begingroup$ Are you asking if the heat from the engines is vaporizing the fuel in the wings? Therefore causing us to lose fuel? $\endgroup$ – Jay Carr Jul 23 '15 at 13:20
  • $\begingroup$ ya! iam asking that. $\endgroup$ – Thangaraj Sundaramoorthy Jul 23 '15 at 13:27
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    $\begingroup$ So real question behind this is how much fuel is lost due to heat from engines mounted,directly next to the tank. $\endgroup$ – vasin1987 Jul 23 '15 at 16:19
  • $\begingroup$ Not really. He is asking if there is a way to avoid this. $\endgroup$ – Fabrizio Mazzoni Jul 30 '15 at 8:29
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According to this image of the locations of the Concorde's fuel tanks:

Concorde fuel tank locations
Borrowed from: ConcordeSST.com

and this image of the location of the Concorde's engines:

Concorde engines
Also from ConcordeSST.com

It doesn't appear that there is a lot of room for direct transfer of heat from the engines to the fuel tanks.

Also of note, the Concorde's designers intentionally used the fuel for other cooling purposes:

The fuel is also used as a heat sink for cooling purposes. Surplus heat from the air conditioning and hydraulic systems from the constant speed drive and generator and also from the engine lubricating oil is rejected through heat exchangers to the fuel.
--ConcordeSST.com

Based on this, I would say that the amount of fuel vaporized by engine heat was minimal at best, and, therefore, of no concern.

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