From mboxrd@z Thu Jan 1 00:00:00 1970 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me X-Spam-Level: X-Spam-Status: No, score=-1.2 required=5.0 tests=BAYES_00,FROM_LOCAL_HEX, FROM_STARTS_WITH_NUMS autolearn=no autolearn_force=no version=3.4.4 X-Google-Thread: 103376,7e8cebf09cf80560 X-Google-NewGroupId: yes X-Google-Attributes: gida07f3367d7,domainid0,public,usenet X-Google-Language: ENGLISH,ASCII-7-bit Path: g2news2.google.com!news4.google.com!fu-berlin.de!uni-berlin.de!individual.net!not-for-mail From: "Vinzent Hoefler" <0439279208b62c95f1880bf0f8776eeb@t-domaingrabbing.de> Newsgroups: comp.lang.ada Subject: Re: How would Ariane 5 have behaved if overflow checking were not turned off? Date: Thu, 17 Mar 2011 22:37:04 +0100 Message-ID: References: <82d3lsvqw7.fsf@stephe-leake.org> <4d8200cc$0$43837$c30e37c6@exi-reader.telstra.net> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed; delsp=yes Content-Transfer-Encoding: 7bit X-Trace: individual.net D8EqYp6OkmtSkx/YyNNpNwP/7v2GjymdeHur47HKzor/AlN+iB Cancel-Lock: sha1:oTaXKRgQNFK9xJy/vMtwoSVfM8Q= User-Agent: Opera Mail/11.01 (Win32) Xref: g2news2.google.com comp.lang.ada:19264 Date: 2011-03-17T22:37:04+01:00 List-Id: robin wrote: > Stephen Leake wrote in message <82d3lsvqw7.fsf@stephe-leake.org>... >> >> Ariane 5 is a bigger rocket; it has bigger accelerations. > > It does? The Report doesn't say anything about that. > What it *does* say is that the horizontal velocity was greater > in Ariane 5 than Ariane 4. > That doesn't mean that the acceleration upwards was greater. It *does* say it on page 12: |p) Ariane 5 has a high initial acceleration [...] which leads to a | build-up of horizontal velocity which is five times more rapid | than for Ariane 4. The higher horizontal velocity [...] generated, | within the 40-second timeframe, the excessive value which caused | the inertial system computers to cease operation. "build-up of horizontal velocity [...] five times more rapid" "higher horizontal velocity [...] within the 40-second timeframe" I read that as "the acceleration is bigger". But maybe I remember my physics classes wrong and there are other ways to reach a higher velocity within the same time than just by increasing the acceleration. And for the "bigger rocket", you can simply compare the thrust data: You might notice some minor differences in the numbers. ;) Vinzent. -- A C program is like a fast dance on a newly waxed dance floor by people carrying razors. -- Waldi Ravens