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Ariane 6 Baseline Config Set  
User currently offlinefrancoflier From France, joined Oct 2001, 3761 posts, RR: 11
Posted (1 year 2 months 5 days 21 hours ago) and read 4205 times:

The ESA has painted a fairly clear picture of what the next gen Ariane launcher is set to look like.
Ariane 6 is destined to replace Ariane 5 circa 2021 and interestingly, its design aims at a simpler, cheaper rocket with a payload to orbit capability similar to that of the current Arianespace workhorse.

The most interesting design choice is that of the full solid propellant 1st and 2nd stages.
Exit the Vulcain engine, enter 3 solid propellant boosters, closely based on that of the smaller Vega launcher, all in an effort to cut cost. They're also going back to a 3 stages setup, with the 2nd stage also going solid. The third stage (payload container) retains a reignitable liquid propellant engine, for obvious reasons.

Ariane is now becoming, more than ever, a 'light the fuse, step back and enjoy the show' rocket. I like the 'back to basics' approach, but I will miss the beautiful (and beautifully complex) liquid fuel engines. I guess throttling isn't a dire necessity anymore?
I'm not up to date on the issue, but I wonder if there is any other commercial launcher out there that relies so much on solid propellant?

Are the solid fuel boosters steerable?

http://www.flightglobal.com/news/art...-on-solid-fuel-foundations-388069/


Looks like I picked the wrong week to quit posting...
4 replies: All unread, jump to last
 
User currently offlinerwessel From United States of America, joined Jan 2007, 2351 posts, RR: 2
Reply 1, posted (1 year 2 months 5 days 12 hours ago) and read 4131 times:
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Quoting francoflier (Thread starter):
I'm not up to date on the issue, but I wonder if there is any other commercial launcher out there that relies so much on solid propellant?

The Titan IIIC/IIID/IIIE/34D/4 did lift off purely on the solid boosters, and started the liquid core stage during the flight. The Japanese Mus were solids, but are now also retired. Orbital Sciences has several (Minotaur, Pegasus, and Taurus). The Israeli Shavits (although they’ve not done any commercial work). There are several others. A list:

http://en.wikipedia.org/wiki/Compari...lid-fuelled_orbital_launch_systems

There have been several proposals to build a launcher for small satellites out of solid fueled ICBMs, although not too much has actually happened.

Quoting francoflier (Thread starter):
Are the solid fuel boosters steerable?

Well, you'd better have some sort of steering!

While different techniques are possible, a gimballing nozzle is pretty common. Vanes in the exhaust stream have been done, as well as separate attitude control thrusters. While I've not actual information on what Ariane is planning, given the size I'll be surprised if it isn't a gimballing nozzle.


User currently offlinefrancoflier From France, joined Oct 2001, 3761 posts, RR: 11
Reply 2, posted (1 year 2 months 5 days 8 hours ago) and read 4060 times:

Quoting rwessel (Reply 1):
he Titan IIIC/IIID/IIIE/34D/4 did lift off purely on the solid boosters, and started the liquid core stage during the flight.

Thanks. Didn't know that. I thought the liquid fuel engine went off from the start like the current Ariane 5.

Quoting rwessel (Reply 1):
Vanes in the exhaust stream have been done,

As early as the V2, if I'm not mistaken. But yes, gimballed nozzles it will most likely be...

How about thrust control? Thrust pattern can be pre programmed, but is there a need for ad hoc throttling during launch?



Looks like I picked the wrong week to quit posting...
User currently offlinerwessel From United States of America, joined Jan 2007, 2351 posts, RR: 2
Reply 3, posted (1 year 2 months 4 days 15 hours ago) and read 3868 times:
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Quoting francoflier (Reply 2):
How about thrust control? Thrust pattern can be pre programmed, but is there a need for ad hoc throttling during launch?

While there are some methods for variably throttling a solid, none are pretty, although variable lateral vents can work to a degree.

But pretty much no. You can fiddle the thrust profile by shaping the fuel in various ways, and mostly it's left at that. You can add some fiddle by flying a non-optimal flight path (one trivial example is that you could fly a bit of an S-curve to scrub off some excess energy), but usually it's mostly left to a liquid upper stage to get rid of any accumulated error. And ballast.


User currently offlinejollo From Italy, joined Aug 2011, 226 posts, RR: 0
Reply 4, posted (1 year 1 month 2 weeks 3 days 13 hours ago) and read 3108 times:

Quoting francoflier (Reply 2):
But yes, gimballed nozzles it will most likely be...

Concur. Possibly with electrical actuators pioneered in Vega (actually, electro-hydraulic, but the hyd circuit is self-contained within the actuator unit).


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