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 Post subject: Re: Cirrus SF50
PostPosted: 19 Apr 2017, 07:40 
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Username Protected wrote:
I wonder why Cirrus didn't explore the single engine turboprop development as their "step up" airplane. Or maybe I'm wrong, wasn't that the Kestrel?


No, Kestrel was the basis for Alan K. to get back into aviation after being kicked out of Cirrus for almost bankrupting the company chasing the SSF50.

Tim


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 Post subject: Re: Cirrus SF50
PostPosted: 19 Apr 2017, 08:30 
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Username Protected wrote:
I wonder why Cirrus didn't explore the single engine turboprop development as their "step up" airplane. Or maybe I'm wrong, wasn't that the Kestrel?

Because there are already a bunch of those.


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 Post subject: Re: Cirrus SF50
PostPosted: 19 Apr 2017, 09:10 
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The results are inescapable. An off airport landing in an SF50 is substantially more impact energy and substantially more fuel than a Bonanza facing the same situation.

Mike C.

Wow. A pressurized turbine plane has more kinetic energy than a piston single. Who'd have thought ? Surely no one will want to fly a turbine powered plane after this revelation becomes public


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 Post subject: Re: Cirrus SF50
PostPosted: 19 Apr 2017, 09:11 
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Username Protected wrote:
Wouldn't the impact energy under the chute canopy in the Cirrus surely be less than the Bonanza?

Probably. No one really knows because Cirrus never did a full up system test as they petitioned the FAA to excuse them from that requirement. Part of that argument is that the chute provides no benefit towards any certification requirements.

One issue is that the SR series always had the landing gear to absorb impact since it was fixed gear. The SF50 doesn't, the gear could be retracted at impact. So the impact may be more severe.

The first customer to pull the chute will become a test pilot. It will be interesting to see what the outcome is.

As you noted, the chute doesn't work for a engine failure at low altitude. A second engine does. In that scenario, the SF50 has substantially more impact energy than a Bonanza.

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I'd also point out that the Cirrus will be arriving at the destination airport in 1/2 the time our esteemed BT brother will be in his Bonanza, in pressurized, air conditioned comfort.

And the twin jet flyer gets there faster, flies higher out of more weather, just as comfortable, uses less fuel doing so, and can handle an engine failure in all regimes of flight with high safety.

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oh wait the Cirrus has a computer to keep him from pulling such crazy moves...

Oh wait, the computer can make mistakes. Bad logic, bad sensors, bad input data, etc.

Read the FSB report, sounds like the computer didn't always agree with the pilots when it comes to stall warning and behaviors.

It still freaks me out the SF50 needed a stick pusher. You usually only see that in swept wing jets with dangerous stall behavior. For example, Beech Premier. The pusher exists only because forcing the nose down against the pilot wishes is LESS dangerous than actually stalling. For a straight wing simple jet, it should not have required one, like Mustang and Eclipse.

Mike C.

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 Post subject: Re: Cirrus SF50
PostPosted: 19 Apr 2017, 09:14 
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Why do your comments about the SF50 come across as hate?

Nobody like facts ruining their love affair with the SF50.

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I dare you - say something nice about the SF50. One thing. : )

It will help sell entry level twin jets after owners fly the SF50 for a few years.

Mike C.

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 Post subject: Re: Cirrus SF50
PostPosted: 19 Apr 2017, 09:27 
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If you can find me a jet that does not have ailerons at all, not a combination of ailerons and spoilers but no ailerons at all, let me know.

B-52
Mitsubishi MU-300
Beechjet/Hawker 400
F-14

Off the top of my head. Correct me if I'm wrong. I'm pretty sure the SF50 has ailerons. :)

Nathan


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 Post subject: Re: Cirrus SF50
PostPosted: 19 Apr 2017, 09:34 
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Username Protected wrote:
Nobody like facts ruining their love affair with the SF50.

Mike C.

You post "opinion".... not very many "facts".


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 Post subject: Re: Cirrus SF50
PostPosted: 19 Apr 2017, 09:41 
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Username Protected wrote:
You post "opinion".... not very many "facts".

In my opinion, that isn't a fact.

Mike C.

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 Post subject: Re: Cirrus SF50
PostPosted: 19 Apr 2017, 09:48 
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Mike posts plenty of facts which are legitimate points about ways that the SF50 (a small, owner-flown plane) does not meet the same specs as large business jets and airliners. What he misses is that nobody cares.


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 Post subject: Re: Cirrus SF50
PostPosted: 19 Apr 2017, 09:56 
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Quote:
I dare you - say something nice about the SF50. One thing. : )

It will help sell entry level twin jets after owners fly the SF50 for a few years.

Mike C.


:coffee: Well Played.

Tim


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 Post subject: Re: Cirrus SF50
PostPosted: 19 Apr 2017, 10:01 
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 Post subject: Re: Cirrus SF50
PostPosted: 19 Apr 2017, 10:24 
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I sure hope they make too many of them and flood the market, because I will want a 10-year-old used one that hopefully will have depreciated considerably.

I saw the jet as Osh last year and it's impressive looking. Making an affordable personal jet seems an elusive achievement. I'm glad Cirrus is taking a crack at it.


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 Post subject: Re: Cirrus SF50
PostPosted: 19 Apr 2017, 10:31 
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Username Protected wrote:

It still freaks me out the SF50 needed a stick pusher. You usually only see that in swept wing jets with dangerous stall behavior. For example, Beech Premier. The pusher exists only because forcing the nose down against the pilot wishes is LESS dangerous than actually stalling. For a straight wing simple jet, it should not have required one, like Mustang and Eclipse.


PC-12 has a pusher, so does the HondaJet.

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 Post subject: Re: Cirrus SF50
PostPosted: 19 Apr 2017, 10:34 
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You guys are savage!

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 Post subject: Re: Cirrus SF50
PostPosted: 19 Apr 2017, 11:09 
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I have been looking around for FAA A/C guidance on stalls.
I recall that the FAA has changed the requirements, and now requires stall warning on all new certified jets, regardless of stall behavior. I think it was because of the Colgan Air crash going to Buffalo. From what I recall, companies are basically given three choices, stick pusher, stall buffet that shakes the stick, or computer control that prevents stalling. Stall warning sounds and benign stall characteristics were eliminated as options.

Does anyone know what the current FAA thinking is?

Tim


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