New Mars

Wow that's huge but from the image it is still not possible to tell how many sides the fuel will be allowed to burn on from the star pattern as this affects ISP.

There's more details in that document where it says 12 forward fins compared with 11 for the 4 segment motor.

It actually won't affect Isp much, since this is a function of the fuel typically. It will change the burn rate/thrust however.

that means its propellent will burn 9.1% faster, so, the burn time should fall from 128 seconds to 116.3 seconds

the thrust may be increased in a similar value, that means the (known) past SRB-5 had a lack of thrust, like the 4+1 SRB test has shown in 2003 and like I've said in my SRB-5 and Ares-1 articles (so, I was right, again... )

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No gaetano, since the five and four segment boosters will use different propellant mixes, enabling the five-segment booster to burn a little longer. The "4+1" test motor used the old propellant and old configuration.

Whoops, your wrong.

the faster burn time is SURE with the increase of the propellent's burning surface, while, the "new mix" should (or should not...) add THRUST and NOT more burning time, so, the SRB-5 thrust could be higher than the +9% of the 4+1 SRB test (but I doubt it will reach the +25% the new SRB needs to compensate its +25% increase of weight) but the burning time MUST/WILL be LOWER

also, that means a lower 1st stage separation altitude and a lower acceleration at this separation, then, the Ares-1, with the SRB-5, absolutely needs (more than past) an SSME-class 2nd stage engine or TWO J-2X (or my "J-2Y" superengine)

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Calculating burn time will involve a very detailed model of the whole system, the combustion process, dynamic geometry and many other factors that all have to be simulated. It's not as easy as multiplying by a factor of 12/11 (9%) LOL

The latest Ares V design shows burn time of the 5 segment motor at 125.9 seconds.

the full 5 segments motor has NEVER (really) "burned" (LOL)

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5 Segment SRB Test at Thiokol

sorry, but this is NOT the real 5-segments SRB but only the 4+1 segments test of which I talk here and in the August 12, 2006 update of my July 28, 2006 "Why the 5-segments SRB can't work" article:

http://www.gaetanomarano.it/articles/011srb5.html

and this is the link to the NASA article reporting the 4+1 segments SRB test:
http://www.nasa.gov/centers/marshall/ne ... 3-186.html

this 4+1 SRB test was made with standard segments, then, WITHOUT any new propellent grain and/or shape

I thought you said you weren't going to use colors for speaking on forums anymore.

I thought he gave up speaking on the forums when everyone decided to stop listening to his conspiracy theories.

Oh brotherThe burn rate, and hence burn time, is a function of the surface area and how fast the fuel burns per area. So, you could have two identical boosters, one with a fast and one with a slow burning fuel, and the slow-burning one will burn longer.

This isn't exactly rocket science.

Oh, and is it possible for a mod to change his signature so it doesn't have blank period lines and big red multi-exclamation mark insane-self-aggrandizement?

Only an Admin can mess with profiles.

Perhaps gaetanomarano will do this voluntarily in the interests of international harmony.

If he does, you guys should also cut him a break - not on technical points - but there's this whole "freedom of speech" thing that we try to be kinda generous with, yes?

I've changed the signature and the post colors... however, I feel that are NOT "colors" the true reason why so many peoples on so many forums post so many (angry) critics "Direct"-ed against me...

you're right, but the SRB-5 needs a propellents that burns FASTER to add more thrust (as expected) ... if the new shape adds no extra-thrust, there is not any reason to to change the current shape

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Latest concept image

BIG version

(just for you gaetanomarano, so you can see the real first stage burn ha ha)

will anyone ever actually get a picture from that angle?

Nnnnope. Any aircraft or balloon that close would risk impact or incineration.