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Frodo, your posts are very well thought and written. I for one welcome your experience and realism, even (and especially) if it sometimes mean a little raining on the current Rutan-SpaceX-parade <img src="/images/icons/wink.gif" /> I'm not a die-hard fan on either one but wish them luck. Rutan still has that gigantic leap from suborbital hop to true orbit ahead. SpaceX seems to have the equipment ready but inaugural flight keeps getting postponed.<br /><br />I happen to have The Right Stuff on DVD, great film indeed. Contains some hilarious dry humour, like face of the guy pressing launch-button, almost too afraid to act after those numerous failures. Like in the movie it was a hard start for both US and soviets, the latter just managed to cover up accidents better, thanks to secretive communist regime. It's about fifty years since those actual mishaps were filmed. So much progress has happened since that a row of such stellar pad-failures before getting it right is doubtful. Especially with SpaceX because their design is very conservative, not trying to push any envelope unlike NASA which has and should continue to do so. <br /><br />Now, the little Falcon V 20 launch campaign example, it's purpose was just to give some general direction of cost compared to the other options, nothing more serious. I'm fully aware that such a massive amount of launches for single purpose is very unlikely in the near term, with any vehicle. <br /><br />If the delivered propellant need would be the said 250000 pounds per year then economy of scale might favor Falcon V. If we give no upper limit to the annual delivery then all bets are off (hi mrmorris <img src="/images/icons/wink.gif" /> ). Other factor is what the destination is. If it's a moon/mars liner awaiting filling her up then there might be tight schedule to force the delivery in one superheavy shot. <br /><br />An orbital fuel depot is another story. It would allow the delivery from earth in smaller amounts while being able to fill the