1956 ... hot off the drawing board!

... yet another 'out-there' proposal for a Supersonic Intercontinental Bomber. The reference to HEF fuel was the long-sought, but never fulfilled, Boron enhanced 'high energy fuel'. Also known as 'Zip Fuel'.


Anonymous said...

HEF stands for "High Energy Fuel" aka "Zip Fuel". Never actually used. http://en.wikipedia.org/wiki/Zip_fuel

james vaughan said...

... thanks for the info!