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Henry Spencer Quotes

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.

Henry Spencer Quotes: Sometimes People Wonder Why Aeroplanes Are So Cheap And Rockets Are So Expensive. Even The Most Superficial Comparison Shows One

Henry Spencer Quotes: Sometimes People Wonder Why Aeroplanes Are So Cheap And Rockets Are So Expensive. Even The Most Superficial Comparison Shows One

Henry Spencer Quotes: Sometimes People Wonder Why Aeroplanes Are So Cheap And Rockets Are So Expensive. Even The Most Superficial Comparison Shows One

Henry Spencer Quotes: Sometimes People Wonder Why Aeroplanes Are So Cheap And Rockets Are So Expensive. Even The Most Superficial Comparison Shows One

Henry Spencer Quotes: Sometimes People Wonder Why Aeroplanes Are So Cheap And Rockets Are So Expensive. Even The Most Superficial Comparison Shows One

Henry Spencer Quotes: Sometimes People Wonder Why Aeroplanes Are So Cheap And Rockets Are So Expensive. Even The Most Superficial Comparison Shows One

Henry Spencer Quotes: Sometimes People Wonder Why Aeroplanes Are So Cheap And Rockets Are So Expensive. Even The Most Superficial Comparison Shows One

Henry Spencer Quotes: Sometimes People Wonder Why Aeroplanes Are So Cheap And Rockets Are So Expensive. Even The Most Superficial Comparison Shows One

Henry Spencer Quotes: Sometimes People Wonder Why Aeroplanes Are So Cheap And Rockets Are So Expensive. Even The Most Superficial Comparison Shows One

Henry Spencer Quotes: Sometimes People Wonder Why Aeroplanes Are So Cheap And Rockets Are So Expensive. Even The Most Superficial Comparison Shows One

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