09 Jun 2025, 05:43 [ UTC - 5; DST ]
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Post subject: Re: Strange Turbine Glider Showed up at KPMP  Posted: 05 Feb 2016, 19:25 |
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Joined: 11/22/12
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Username Protected wrote: I will be curious as to how Textron deals with this for their announced SETP project, and how Cirrus will get to FL280 on the SF50. Me too. It's probably too late for Cirrus but my money's on Textron using electric pressurization as on the 787, at least as the required second source.
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Post subject: Re: Strange Turbine Glider Showed up at KPMP Posted: 05 Feb 2016, 19:35 |
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Username Protected wrote: It's probably too late for Cirrus but my money's on Textron using electric pressurization as on the 787, at least as the required second source. That means a big battery. It has to work with the engine failed. Mike C.
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Post subject: Re: Strange Turbine Glider Showed up at KPMP Posted: 05 Feb 2016, 20:08 |
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Username Protected wrote: Wouldn't have to work for long. Single engine means you will be beginning your descent mighty fast after you loose that one engine. True, but it is still some power and best glide from high altitude can take some time. FL350 to 15,000 ft may take 25 minutes, for example. To maintain pressurization that long is non trivial energy. Mike C.
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Post subject: Re: Strange Turbine Glider Showed up at KPMP Posted: 05 Feb 2016, 20:36 |
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Username Protected wrote: It's probably too late for Cirrus but my money's on Textron using electric pressurization as on the 787, at least as the required second source. That means a big battery. It has to work with the engine failed.
Or a big ram air turbine, I suppose...
(still enough complexity and weight to make the second engine seem tempting)
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Post subject: Re: Strange Turbine Glider Showed up at KPMP Posted: 05 Feb 2016, 23:48 |
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Username Protected wrote: Or a big ram air turbine, I suppose... I wonder if that can deploy and spool up fast enough to prevent cabin altitude from going above 15,000 ft when the engine fails. It also is robbing you of a precious resource, glide distance, when an engine fails. It is something to maintain, check, etc, so it drives up maintenance costs. Quote: (still enough complexity and weight to make the second engine seem tempting) Yes, the question is not if you can certify a single above FL250, but whether it would just be simpler in the end to have a second engine. For jet, in particular, finding a place to mount one engine is an added complexity a twin does not have. Mike C.
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Post subject: Re: Strange Turbine Glider Showed up at KPMP Posted: 06 Feb 2016, 02:23 |
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Username Protected wrote:
FL350 to 15,000 ft may take 25 minutes, for example. To maintain pressurization that long is non trivial energy.
Should be able to get 6000 FPM emergency descent. 5 min to get down to breathable altitude.
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Allen
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