20 Jun 2025, 02:21 [ UTC - 5; DST ]
|
| Username Protected |
Message |
|
Username Protected
|
Post subject: Re: Strange Turbine Glider Showed up at KPMP  Posted: 05 Feb 2016, 19:25 |
|
 |
|
|
Joined: 11/22/12
Posts: 2845
Post Likes: +2792
Company: Retired
Location: Lynnwood, WA (KPAE)
Aircraft: Lancair Evolution
|
|
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.
|
|
| Top |
|
|
Username Protected
|
Post subject: Re: Strange Turbine Glider Showed up at KPMP Posted: 05 Feb 2016, 19:35 |
|
|
|
|
Joined: 12/03/14
Posts: 20355
Post Likes: +25527
Company: Ciholas, Inc
Location: KEHR
Aircraft: C560V
|
|
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.
_________________
Email mikec (at) ciholas.com
|
|
| Top |
|
|
Username Protected
|
Post subject: Re: Strange Turbine Glider Showed up at KPMP Posted: 05 Feb 2016, 20:08 |
|
|
|
|
Joined: 12/03/14
Posts: 20355
Post Likes: +25527
Company: Ciholas, Inc
Location: KEHR
Aircraft: C560V
|
|
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.
_________________
Email mikec (at) ciholas.com
|
|
| Top |
|
|
Username Protected
|
Post subject: Re: Strange Turbine Glider Showed up at KPMP Posted: 05 Feb 2016, 20:36 |
|
|
|
|
 |
Joined: 08/26/15
Posts: 9937
Post Likes: +9839
Company: airlines (*CRJ,A320)
Location: Florida panhandle
Aircraft: Travel Air,T-6B,etc*
|
|
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)
|
|
| Top |
|
|
Username Protected
|
Post subject: Re: Strange Turbine Glider Showed up at KPMP Posted: 05 Feb 2016, 23:48 |
|
|
|
|
Joined: 12/03/14
Posts: 20355
Post Likes: +25527
Company: Ciholas, Inc
Location: KEHR
Aircraft: C560V
|
|
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.
_________________
Email mikec (at) ciholas.com
|
|
| Top |
|
|
Username Protected
|
Post subject: Re: Strange Turbine Glider Showed up at KPMP Posted: 06 Feb 2016, 02:23 |
|
|
|
|
Joined: 01/31/09
Posts: 5193
Post Likes: +3032
Location: Northern NJ
Aircraft: SR22;CJ2+;C510
|
|
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.
_________________
Allen
|
|
| Top |
|
|
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum
|
Terms of Service | Forum FAQ | Contact Us
BeechTalk, LLC is the quintessential Beechcraft Owners & Pilots Group providing a
forum for the discussion of technical, practical, and entertaining issues relating to all Beech aircraft. These include
the Bonanza (both V-tail and straight-tail models), Baron, Debonair, Duke, Twin Bonanza, King Air, Sierra, Skipper, Sport, Sundowner,
Musketeer, Travel Air, Starship, Queen Air, BeechJet, and Premier lines of airplanes, turboprops, and turbojets.
BeechTalk, LLC is not affiliated or endorsed by the Beechcraft Corporation, its subsidiaries, or affiliates.
Beechcraft™, King Air™, and Travel Air™ are the registered trademarks of the Beechcraft Corporation.
Copyright© BeechTalk, LLC 2007-2025
|
|
|
|
not a twin vs single debate flare up, I promise.
