Just think of how much more difficulty we would have with a jet engine." Not necessarily. I was digging through the DVDs on jet engines and came acros... a very simple design: the pulse jet. It has almost no moving parts and does not need fine machining. In fact, it would be much easier to make than one of our Sterling engines." If the pulse jet is so good, why was it never used commercially back on Old Earth?" That's just it, the pulse jet is easy to build, but does not have the efficiency of. He walked towards me, the closer he got, the more disgusting he looked, dirty and unshaven. He picked up my bike and carried it off."You can come and watch if you like?" he offered over his shoulder."Thanks," I replied and docilely walked after him.His workshop, in his back garden was surprisingly tidy, with all his tools hanging on the wall. I watched him remove both wheels and then the tubes. I noticed that he looked at me from time to time while he worked."No punctures, just the valves I. More

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