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MFAFF MFAFF is offline
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Join Date: Dec 2002
Location: London
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Fuel leak when cold was the result of not being able to find a sealant flexible enough (and reliable enough) to work long term throughout the temperature range.

It was monitored and when it became too bad the tanks were striped and resealed...

The top off after take off was simply a cost saving measure... less stress on the tyres and also less stress on the brakes if T/O needed to be rejected.

As tanker support was always needed during the CIA/ USAF operations of the A12/SR-71, it made sense.

When NASA flew them in the 1990s after the 'first retirement' they used full fuel take offs as they did not have tanker support at Edwards. They also used full fuel when they had the YF-12A and the 'YF-12C' on their books in the 1970s
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Old 11-10-2014, 09:01 PM
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