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- Newsgroups: sci.space.shuttle
- Path: sparky!uunet!pmafire!news.dell.com!swrinde!zaphod.mps.ohio-state.edu!sdd.hp.com!caen!destroyer!ncar!noao!stsci!stosc!gawne
- From: gawne@stsci.edu
- Subject: Re: Launch sequence of events?
- Message-ID: <1992Nov9.111719.1@stsci.edu>
- Lines: 16
- Sender: news@stsci.edu
- Organization: Space Telescope Science Institute
- References: <BxDsr6.AG1@zoo.toronto.edu> <1992Nov9.054245.3985@news.duc.auburn.edu>
- Distribution: na
- Date: Mon, 9 Nov 1992 16:17:19 GMT
-
- In article <1992Nov9.054245.3985@news.duc.auburn.edu>,
- forrepr@eng.auburn.edu (Philip R. Forrest) writes:
- > Here's a good trivium...How can ANY engine develop more than 100% of rated
- > power output ?? (i.e. 104% ?)
-
- Easy, just get it rated conservatively. My Dodge 318 is *rated* at
- 150 bhp from the factory. But a rear-wheel dynomometer measures 235
- bhp at 4400 rpm in high gear. Thus the engine produces (235/150)*100%
- of its rated power. That's 157% of *rated* power.
-
- In the case of the shuttle the main engine's power output was rated
- based on preliminary information that proved to be slightly conservative
- after testing. Thus the main engines are easily run up to 104% of their
- rated power.
-
- -Bill Gawne, Space Telescope Science Institute
-