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 Post subject: Diamond DA62 "Golden Hour on the Continental Divide"
PostPosted: 15 Mar 2021, 21:07 
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By Steve Zimmerman. Definitely not mine. ;)

[youtube]http://youtu.be/3MDUoy_fOBo[/youtube]

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The video starts just before sunset, running southbound along the Continental Divide south of Breckenridge at 13,000'. It ends with a time-lapse descent into the Denver metro area and a run northbound toward downtown Denver as the city lights take hold.

In the first sequence, after the turn eastbound you can see the high, snow-covered valley known as South Park at far right. Early in the time lapse sequence Pikes Peak is visible at far right, on the horizon; after a 270º turn northbound you can see Longs Peak at left on the horizon. The two Fourteeners are just under 100 miles apart.

More on Steve's YouTube channel: https://www.youtube.com/channel/UC81Dj-fEs6_qtRqcO7rVRvg


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 Post subject: Re: Diamond DA62 "Golden Hour on the Continental Divide"
PostPosted: 15 Mar 2021, 21:51 
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Joined: 06/28/09
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Stunning, very cool!

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 Post subject: Re: Diamond DA62 "Golden Hour on the Continental Divide"
PostPosted: 17 Mar 2021, 16:04 
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Joined: 12/17/17
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Username Protected wrote:
By Steve Zimmerman. Definitely not mine. ;)

[youtube]http://youtu.be/3MDUoy_fOBo[/youtube]


More on Steve's YouTube channel: https://www.youtube.com/channel/UC81Dj-fEs6_qtRqcO7rVRvg


Thanks for posting this here, Chris. I also own an A36 Bonanza; tomorrow we’re flying both airplanes in a cover shoot for a national magazine. The A36 is the photo ship and the Diamond (which I’ll be flying) is the subject. I’m used to being the shooter rather than the subject; should be fun.

You can see more of my aviation photography on my website, https://www.stevezphoto.us


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 Post subject: Re: Diamond DA62 "Golden Hour on the Continental Divide"
PostPosted: 26 Mar 2021, 10:54 
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Good Stuff! Thanks for sharing. Ah the comfort of a twin.
:cheers:


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 Post subject: Re: Diamond DA62 "Golden Hour on the Continental Divide"
PostPosted: 27 Mar 2021, 11:34 
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Joined: 06/09/09
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Aircraft: C182P, Merlin IIIC
Saw one of these up close today. Nice looking plane.


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 Post subject: Re: Diamond DA62 "Golden Hour on the Continental Divide"
PostPosted: 27 Mar 2021, 17:12 
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Nice plane.

One odd thing though is that (according to the AFM I dowloaded from the manufacturer's website) if you have a dual alternator failure, you can expect the engines to stop in 30 minutes (when battery backup is exhausted). The engine control units apparently cannot function at all without electricity.

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 Post subject: Re: Diamond DA62 "Golden Hour on the Continental Divide"
PostPosted: 28 Mar 2021, 16:21 
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Username Protected wrote:
Nice plane.

One odd thing though is that (according to the AFM I downloaded from the manufacturer's website) if you have a dual alternator failure, you can expect the engines to stop in 30 minutes (when battery backup is exhausted). The engine control units apparently cannot function at all without electricity.


Seems it does, interesting. Is this what you are referring to?
>>> 3.3.1 page 101 of 508
(Referred to, on page 4B-20, section 4B.3.6)

http://support.diamond-air.at/fileadmin ... mplete.pdf

"(b) Both Alternators Failed
WARNING
If both alternators fail at the same time, reduce all electrical
equipment to a minimum. Expect battery power to last
30 minutes and land the airplane as soon as possible. Expect
engine stoppage after this period of time."


I guess the ECU's like to have operating current. Logical enough.

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 Post subject: Re: Diamond DA62 "Golden Hour on the Continental Divide"
PostPosted: 28 Mar 2021, 17:29 
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I guess the ECU's like to have operating current. Logical enough.

Logical enough, but is it necessary? Why not have a fail safe mode that leaves it at a pre-set power setting, say 75%? Lots of modern aircraft have FADEC and still revert to a crude manual control if the computer fails.

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 Post subject: Re: Diamond DA62 "Golden Hour on the Continental Divide"
PostPosted: 28 Mar 2021, 18:39 
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Weird isnt it. While different if the FCU on a PT-66d quits the More control allows you to directly add fuel, carefully. This should be an interesting question as to why they aren’t creating enough power to burn the diesel... Where are the BT engineers ? The question lingers why the engine quits.

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 Post subject: Re: Diamond DA62 "Golden Hour on the Continental Divide"
PostPosted: 28 Mar 2021, 18:58 
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Maybe it doesn't have an engine driven fuel pump?


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 Post subject: Re: Diamond DA62 "Golden Hour on the Continental Divide"
PostPosted: 29 Mar 2021, 05:38 
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Username Protected wrote:
Is this what you are referring to?

Yep. Kind of takes away the comfort of flying a twin, especially over water. Admittedly a dual alternator failure seems pretty unlikely, but so is a SETP engine failure. And I would not feel totally comfortable flying a SETP any appreciable distance over water.

On the DA42 they have a one-time-use lithium manganese primary battery backup system for the backup flight instruments (not sure what they use for this in the DA62). Maybe they could install a similar, larger primary battery backup system on the DA42 and DA62 to augment the rechargeable ECU backup batteries. I wonder how big a battery you would need to run the ECU's for, say, three hours?

When we're all flying electric planes this will become moot...

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 Post subject: Re: Diamond DA62 "Golden Hour on the Continental Divide"
PostPosted: 29 Mar 2021, 06:09 
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I should point out that the main purpose of the ECU backup batteries is apparently to prevent the ECU's from dropping out and feathering the props in the event that the main battery is in a low charge state and the landing gear is retracted after takeoff, causing the main battery voltage to drop below a usable level for the ECU's. It appears to be a happy side effect that the ECU backup batteries (in conjunction with the main battery?) will power the ECU's for 30 minutes after a dual alternator failure.

The only thing I can conclude is that a dual alternator failure is thought to be so unlikely that (akin to a dual engine failure) there's no real plan to deal with it other than an (eventual) forced landing.

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 Post subject: Re: Diamond DA62 "Golden Hour on the Continental Divide"
PostPosted: 29 Mar 2021, 06:45 
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Username Protected wrote:
I guess the ECU's like to have operating current. Logical enough.

Logical enough, but is it necessary? Why not have a fail safe mode that leaves it at a pre-set power setting, say 75%? Lots of modern aircraft have FADEC and still revert to a crude manual control if the computer fails.

Hi John, you must be talking turbines. It's pretty easy to keep a turbine running - just continuously spray in some fuel.

A computer-controlled diesel engine has fuel injectors operated by a waveform, which is produced by the ECM. The ECM operates the electronic injectors at varying timing and duration depending on the maps it's programmed with. Usually, the waveform generator is integral with the ECM.

So there is no way to operate the injectors without the ECM. Generally these are extremely reliable, far more reliable than older diesels with mechanical injection pumps. Still, on many marine engines there are dual redundant ECM's with automatic failover.

In no case though, can you operate the ECM (and therefore the fuel injectors) without electricity.

as far as backup ecm operation, there are lots of implementations that vary from full redundancy to limp-home bare bones. The way I've been involved in these, it can be set to automatically fail-over or you can manually select one ECM or the other at this panel circled in red.

But again, this is in a boat. The whole idea starts to seem like a lot of weight and wiring on a light airplane.

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