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newtboy (Member Profile)

SpaceX's Falcon Heavy Lands All Three Boosters

How a 1929 Silent Film Created the Countdown to Launch

BSR says...

Before the space shuttle would launch, the main engine would ignite first. After six seconds the two solid rocket boosters would ignite and the shuttle would launch.

The six second delay was necessary because the main engine ignition would rock the "stack" or the entire assembly of the shuttle, fuel tank and boosters forward. It took 6 seconds for the stack to return to the upright position.

This 6 second period of sway was referred to as "twang."

Figured I'd pass that little bit of info on to you in case you're ever asked about twang on a radio quiz show.

eric3579 said:

Today i learned the water used during a launch is used to dampen sound waves.

Launch Of Elon Musk's $250,000 Tesla Into Space 2/6/18 LIVE

Jinx says...

Watched it live. Hype was infectious. Seeing the two side boosters coming down together in almost perfect synchronisation was quite a thing.

SpaceX - BFR - Anywhere on Earth in an Hour

Mordhaus says...

Going to need to forget this video to partake in this flight.

*related=https://videosift.com/video/How-Not-to-Land-an-Orbital-Rocket-Booster

SpaceX - BFR - Anywhere on Earth in an Hour

Farhad2000 (Member Profile)

Farhad2000 (Member Profile)

Best of the best Shuttle launches

BSR says...

I lived in Cape Canaveral during the shuttle program and was fortunate enough to watch all but 5 launches live.

An excellent video with scenes I thoroughly enjoyed in slow motion and HD.

A brief mention in the video about the 6 seconds from when the main liquid engines ignite until the solid boosters ignite is called "twang."

When the main engines ignite, the power causes the whole assembly to rock forward. It takes 6 seconds for the assembly to fall back to vertical again and then the boosters light up and away it goes.

Boston Dynamics New Nightmare Inducing Robot-Handle

Jinx says...

ahhhh yeah

geekgasm at the end there.

But ok, now the wheels need to be able to lock tight so it can walk on them and then attach rocket boosters to help it pick up speed and/or hover/fly and you've got mechas. All we need now is to develop hairspray strong enough to maintain those anime dos and we are golden.

SpaceX Interplanetary Transport System

NASA’s new High Dynamic Range Camera Records Rocket Test

newtboy says...

I had not realized that the solid rocket boosters were steerable....at least I hope they are moving the nozzle intentionally and that it's not moving around on it's own.
Incredible camera...at 1/4 speed you can see the pressure waves move through the flame trail.

Late Night with Seth Meyers: Kansas Tax Cuts

MilkmanDan says...

@eric3579 Thanks for the quality!

My mom is president of a district school board in Kansas, so the "education" parts of the cuts have hit really close to home for her (and by extension me, even though I'm not living there). Very very tight budgets. Most music programs got drastic cuts years ago, and are effectively gone now. AP programs for college credit? Gone. Good teachers for academic subjects? Usually bail for greener pastures very quickly.

...But, being rural Kansas, plenty of money gets spent on bus / coach / equipment / facilities for the football team. To be fair, a good chunk of that comes from booster clubs rather than gov't. Still shows where the priorities are.

Man Lights 10K Sparklers on Fire for New Year and Result....

rich_magnet (Member Profile)

oritteropo says...

The return was from about twice the altitude of the Blue Origin booster, with a vehicle that's significantly larger and more powerful. I don't have the numbers for the aerodynamic stresses, but I'd be pretty surprised if that was the case.

Here's a comparison of their flight trajectories - http://i.imgur.com/ATkpdAX.png

And here's a comparison of the vehicles - https://i.imgur.com/zrLWBLJ.png

I don't want to take anything away from the ridiculously awesome achievement of Blue Origin, they have the record for first landing of a reusable booster from edge of space and good luck to them.

rich_magnet said:

The booster is not orbital. It's on a ballistic, suborbital flight just as for the Blue Origin booster. The second stage goes to orbit and note that they are not trying to recover that one at all, let alone land it.

In fact, the SpaceX booster does several deceleration burns in space, and so experiences less aerodynamic stress than does the Blue Origin booster, which actually flies faster, according to the article I linked above.



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