Phrase by 'Henry Spencer'
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Past experience, on the shuttle and the Titan rockets, suggests that large multi-segment solid rockets have a probability of failure of 0.5 to 1 per cent.
Author: Henry Spencer - Canadian ScientistPast , Experience , Failure , Solid
Sometimes people wonder why aeroplanes are so cheap and rockets are so expensive. Even the most superficial comparison shows one obvious difference: aeroplane engines use outside air to burn their fuel, while rockets have to carry their own oxidisers along.
Author: Henry Spencer - Canadian ScientistSometimes , People , Space , Burn
Liquid oxygen is one of the cheapest manufactured substances on Earth. In large quantities, it costs pennies per kilogram - cheaper than milk or beer.
Author: Henry Spencer - Canadian ScientistBeer , Earth , Milk , Oxygen
Trying to build a spaceship by making an aeroplane fly faster and higher is like trying to build an aeroplane by making locomotives faster and lighter - with a lot of effort, perhaps you could get something that more or less works, but it really isn't the right way to proceed.
Author: Henry Spencer - Canadian ScientistYou , Effort , Way , Fly
As plans for the first lunar landing started to be made, nobody had really thought about who would be out first.
Author: Henry Spencer - Canadian ScientistWho , First , Nobody , Thought
The original specifications for Apollo navigation called for the ability to fly a complete mission, including a lunar landing, with no help from Earth - none, not even voice communications.
Author: Henry Spencer - Canadian ScientistHelp , Earth , Voice , Fly
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