Author Topic: Can New Zealand be the 11th country to launch satellites into orbit?  (Read 7797 times)

Offline smartcooky

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http://www.stuff.co.nz/business/industries/69859442/rocket-lab-eyes-birdlings-flat-canterbury-as-launch-site

http://fortune.com/2015/04/17/rocket-lab-satellites-space/

Lithium-Ion battery powered electric turbopumps?

What do you rocket scientist guys think. Does this really sound feasible?


If you're not a scientist but you think you've destroyed the foundation of a vast scientific edifice with 10 minutes of Googling, you might want to consider the possibility that you're wrong.

Online Kiwi

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Re: Can New Zealand be the 11th country to launch satellites into orbit?
« Reply #1 on: July 01, 2015, 09:28:20 AM »
There's a little more about the engine in this April thread:--
http://www.apollohoax.net/forum/index.php?topic=839.msg28527#msg28527

...which has a link to an article that has a video of tests of the engine and close-ups of its construction:--
http://www.stuff.co.nz/business/small-business/67717283/rocket-lab-unveils-electric-rocket-engine

It's not as impressive as a Saturn V, but hey, aren't some of us here impressed by almost any rocket as long as it works?

I remember being about 8 or 9, so in 1957 or 1958, finding a small spider and coaxing it into a small glass jar, capping the jar and tying a piece of string to it, and tying the other end of that to a fireworks rocket via a hole I had drilled in the bottom of the wooden tail, so it must have been early in November, close to Guy Fawkes.  Was too impatient to wait for darkness, so immediately lit the rocket, which rocketed up until the string went taut and it started to drag the jar up. But it went up about 5 metres (16 feet), and took the jar up about 3-4 meters, then sputtered back down to the ground without setting fire to any of the dry, late spring grass.

Spidey survived the g-forces and staggered away with an unsteady gait to continue doing whatever little spiders do on a sunny day.

Total success! I was a rocketeer!

Edited to add: November 1957 seems to be the best candidate because I had seen the first ever satellite, Sputnik 1, on 9 October 1957 at 8:06 pm NZST. And in 1958 after a big air show on 29 March, we aeronauts switched to Super Sabre jets, breaking the sound barrier, and making parachutes for most of that year. We learnt that making a parachute from a split-open sack and baling twine, tying it on, and jumping off a shed roof was not successful. In fact, the chute caught on a corner of the roof and the chutist was slammed heavily into the wall.

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Nice to see the New Zealand-born physicist Ernest Rutherford being honoured in the name of the Rocket Lab engine.
« Last Edit: July 01, 2015, 10:18:58 AM by Kiwi »
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Offline Echnaton

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Re: Can New Zealand be the 11th country to launch satellites into orbit?
« Reply #2 on: July 01, 2015, 03:41:21 PM »
Fuel/electric hybrid engines and 3D printing/additive manufacturing seem to be a pretty good bet for the technologies that will drive vehicle development for the next 50 years.  So why not a rocket?  One of the great things about today  is that radical development can be achieved almost anywhere in the world. 
The sun shone, having no alternative, on the nothing new. —Samuel Beckett

Offline smartcooky

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Re: Can New Zealand be the 11th country to launch satellites into orbit?
« Reply #3 on: July 01, 2015, 06:06:06 PM »
Well if it works, it will be the smallest ground-launched rocket to put a satellite in orbit.

However, I question this....
Quote
.....a joint U.S./New Zealand startup aims to cut satellite launch costs by as much as 91 percent.

Using a rocket consisting of 3D-printed parts, Rocket Lab intends to put small satellites weighing as much as 220 pounds into orbit above the Earth, all for a price of $4.9 million per launch.

Presuming this is US$, then my quick back of the envelope calculation says that is about  US$50,000/kg to LEO. That does not sound very competitive to me, so what am I missing?
If you're not a scientist but you think you've destroyed the foundation of a vast scientific edifice with 10 minutes of Googling, you might want to consider the possibility that you're wrong.

Offline ka9q

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Re: Can New Zealand be the 11th country to launch satellites into orbit?
« Reply #4 on: July 01, 2015, 06:23:14 PM »
http://www.stuff.co.nz/business/industries/69859442/rocket-lab-eyes-birdlings-flat-canterbury-as-launch-site

http://fortune.com/2015/04/17/rocket-lab-satellites-space/

Lithium-Ion battery powered electric turbopumps?

What do you rocket scientist guys think. Does this really sound feasible?
Strictly speaking, if they're battery powered they're not turbopumps. Just pumps.

I am skeptical that batteries could provide enough power to drive propellant pumps. These things have to be powerful and draining a battery in just a few minutes usually means using it very inefficiently. Also, it wouldn't make much sense to use lithium-ion rechargeable batteries when lithium primary batteries have better energy density (energy per unit mass). Even if the stage were reusable, replacing the batteries would be a minor cost.