A Quote by Henry Spencer

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

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Space Aeroplanes Air Along Burn Carry Cheap Comparison Difference Engines Even Expensive Fuel Most Obvious Outside Own People Rockets Shows Sometimes Superficial Use While Why Wonder

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Henry Spencer
Canadian - Scientist
Born: 1955

Supplying fuel for a Mars expedition from the lunar surface is often suggested, but it's hard to make it pay off - Moon bases are expensive, and just buying more rockets to launch fuel from Earth is relatively cheap.

Henry Spencer

Whether solid rockets are more or less likely to fail than liquid-fuel rockets is debatable. More serious, though, is that when they do fail, it's usually violent and spectacular.

Henry Spencer

If you're really thinking prayer can stop rockets or bullets, you have to ask why some people do get hit by rockets or bullets. Are they people who no one prayed for? Are they people who God just didn't like? I don't think so.

John Shelby Spong

The essence of air transport is speed, and speed is unfortunately one of the most expensive commodities in the world, principally because of the disproportionate amount of the power required to achieve high speed and to lift loads thousands of feet into the air. This is strikingly illustrated by the fact that while an average cargo ship, freight train and transport aeroplane are each equipped with engines totalling about 2,500 H.P., the ship can carry a load of about 7,000 tons, the train 800 tons and the plane only two and a half tons.

J. R. D. Tata

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.

Henry Spencer

Building and launching rockets has been a lifelong hobby that my son and I share. We regularly travel to Nevada's Black Rock Desert to launch rockets.

Steve Jurvetson

All sorts of artillery installations, rockets and tank units that are firing on civilians in Kosovo should be neutralized. If that means air strikes, then NATO should carry out air strikes.

Fatos Nano

The rockets set the bony meadows afire, turned rock to lava, turned wood to charcoal, transmuted water to steam, made sand and silica into green glass which lay like shattered mirrors reflecting the invasion, all about. The rockets came like drums, beating in the night. The rockets came like locusts, swarming and settling in blooms of rosy smoke.

Ray Bradbury

We possess several hundred atomic warheads and rockets and can launch them at targets in all directions, perhaps even at Rome. Most European capitals are targets of our air force.

Martin Van Creveld

Women in bed are like Diesel engines. What I mean by that is, it may take them a while to get going, but when you do, they can go for a long, long time. Whereas men are like... bottle rockets.

Jeff Foxworthy

Careers, like rockets, don't always take off on schedule. The key is to keep working the engines.

Gary Sinise

I want to make rockets 100 times, if not 1,000 times better. The ultimate objective is to make humanity a multiplanet species. Thirty years from now, there'll be a base on the moon and on Mars, and people will be going back and forth on SpaceX rockets.

Elon Musk

Solid-fuel rockets can't easily be shut down on command.

Henry Spencer

I certainly remember building model rockets. It was fun to watch the rocket blast into the air, suspenseful to wonder if the parachute would open to bring the rocket safely back.

Eric Allin Cornell

I've decided to become a member of the Houston Rockets. I feel it's the best place for me and I am excited about joining the Rockets and I'm looking forward to a great season. I want to thank the fans in Los Angeles and wish them the best.

Dwight Howard

War contributes greatly to global warming, which shouldn't surprise us. All those bombs going off, all those rockets, all those planes and helicopters. All that fuel of various kinds being used. It pollutes the air and water of this very fragile and interconnected planet.

Alice Walker

A Quote by Henry Spencer

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