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gaetanomarano

Member

From: Italy

Registered: 2006-05-06

Posts: 701

Re: Ares VII

Here is a Delta 4-Heavy rocket demo launch timeline note throttle back time, max Q, booster seperation ect...

an interesting article, but has no data about the 2nd stage burning altitude and speed
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SpaceNut

Administrator

From: New Hampshire

Registered: 2004-07-22

Posts: 29,433

Re: Ares VII

The number can be found with just a little searching.

Reference for Mach 1 is a velocity
A simple goggle on the same site gave me the

T+plus 7 minutes, 25 seconds. The rocket is 100 miles in altitude, traveling at 12,000 mph as it streams 600 miles east of the launch pad.

T+plus 18 minutes. The rocket is 131 miles in altitude and traveling at 14,241 nautical miles per hour

The first number at mach 1 will give you a slope for the first stage speed.
Such that we do get to T+0:05:41.0 it can be no less than the slope very at time since the engines to some more changes to throttling as it goes higher.

gaetanomarano

Member

From: Italy

Registered: 2006-05-06

Posts: 701

Re: Ares VII

...number can be found with just a little searching...

not so easy... a data can be found only if available... if available, the keyword used can be wrong... or the right page be the #1638... I've searched the full DIVH data, but, so far, I've not found (not even on the Boeing site!) the exact figure of the DIVH 2nd stage burning altitude ...just the image below (that confirms the data of your link) ...and, from data and image, we can can discover that a DIVH 2nd stage starts burning near SIX MINUTES after lift-off (more than a DIVM thanks to the two boosters and the core-stage's throttle) ...however, the very long 1st stage burning time (three times the Ares-I 1st stage) clearly explain WHY the (very small) 2nd stage engine can put in orbit over 22 mT of payload!

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publiusr

Banned

From: Alabama

Registered: 2005-02-24

Posts: 682

Re: Ares VII

Over at www.nasaspaceflight.com is an admission by member "Jim" that Delta IV is too small to really be efficent.

Delta IV has always been an awkward sized rocket. It is very large for a standard ELV, and yet it really is not big enough at the same time.

It is unwieldy compared to Atlas, yet cannot hold much LH2 compared to the ET or the wider Ares V rocket. remember--Ares V was made wider due to the way RS-68 guzzles cryogenics--so the comparatively thin Delta IV has even more problems.

Delta IV is a bad bird.