29 Mar 2024, 09:37 [ UTC - 5; DST ]
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Post subject: Re: Darkaero? Posted: 06 Jan 2020, 11:21 |
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Joined: 06/05/11 Posts: 387 Post Likes: +172 Location: Atlanta, GA
Aircraft: SR22
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Username Protected wrote: Just as they should be. A plane that can fill the seats and the fuel tanks needs bigger fuel tanks. Or more seats.
And a bathroom.
_________________ Wayne
LinkedIn instagram: waynecease
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Post subject: Re: Darkaero? Posted: 06 Jan 2020, 16:01 |
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Joined: 01/30/09 Posts: 3343 Post Likes: +1948 Location: $ilicon Vall€y
Aircraft: Columbia 400
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Username Protected wrote: So, pilot and co-pilot, each weighing no more than 144 lbs. each (or combined weight of 288 lbs.) with full fuel and no baggage. So it is basically a single place aircraft for long distance flight (like many light planes are).
Also, I'm more impressed with demonstrated cruise speeds than projected cruise speeds.
Dan The photo of the airframe with the two guys standing next to it, show how tiny this thing is. Empty weight of 750lbs! Total gross of 1500lbs. The engine is interesting. It's only 200hp, 5.2 liter, 6-cylinder and only weighs 108kg (238lbs). About 120lbs lighter than an IO360. No turbo, so power output will be low at the listed ceiling of 20,000'. Don't know this engine at all, but it looks interesting. https://ulpower.com/en/engines/ul520/ul520isThat means the entire airframe sans engine will weigh 512lbs.
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Post subject: Re: Darkaero? Posted: 06 Jan 2020, 16:52 |
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Joined: 01/23/13 Posts: 8012 Post Likes: +5717 Company: Kokotele Guitar Works Location: Albany, NY
Aircraft: C-182RG, C-172, PA28
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Username Protected wrote: The photo of the airframe with the two guys standing next to it, show how tiny this thing is. Empty weight of 750lbs! Total gross of 1500lbs. The engine is interesting. It's only 200hp, 5.2 liter, 6-cylinder and only weighs 108kg (238lbs). About 120lbs lighter than an IO360. No turbo, so power output will be low at the listed ceiling of 20,000'. Don't know this engine at all, but it looks interesting. https://ulpower.com/en/engines/ul520/ul520isThat means the entire airframe sans engine will weigh 512lbs. Gotta applaud a couple of young guys tackling a project like this, and I hope they're successful. The dimensions work out to about the same as a Lancair Legacy, though maybe 300 pounds pounds lighter. I suppose that it's possible that 21st century manufacturing helps them make a design that saves so much weight. On the other hand, this is their engine mount. I don't see how the hell this structure is going to be nearly strong enough to hold on to an engine in any but the gentlest flight conditions. Attachment: engine mount.jpg
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Post subject: Re: Darkaero? Posted: 06 Jan 2020, 21:01 |
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Joined: 08/24/13 Posts: 8409 Post Likes: +3662 Company: Aviation Tools / CCX Location: KSMQ New Jersey
Aircraft: TBM700C2
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Username Protected wrote: I hear what you guys are saying about the engine mount, but it weighs ~80 or almost 1/3 less lbs less than a IO-360. Maybe that's part of the idea behind the baby engine mounts. Still insufficient. That thing is rigid in no axis. It also puts the loads in the middle of the bulkhead
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Post subject: Re: Darkaero? Posted: 06 Jan 2020, 21:35 |
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Joined: 12/08/12 Posts: 812 Post Likes: +953 Location: Ukiah, California
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Username Protected wrote: The photo of the airframe with the two guys standing next to it, show how tiny this thing is. Empty weight of 750lbs! Total gross of 1500lbs. The engine is interesting. It's only 200hp, 5.2 liter, 6-cylinder and only weighs 108kg (238lbs). About 120lbs lighter than an IO360. No turbo, so power output will be low at the listed ceiling of 20,000'. Don't know this engine at all, but it looks interesting. https://ulpower.com/en/engines/ul520/ul520isThat means the entire airframe sans engine will weigh 512lbs. Gotta applaud a couple of young guys tackling a project like this, and I hope they're successful. The dimensions work out to about the same as a Lancair Legacy, though maybe 300 pounds pounds lighter. I suppose that it's possible that 21st century manufacturing helps them make a design that saves so much weight. On the other hand, this is their engine mount. I don't see how the hell this structure is going to be nearly strong enough to hold on to an engine in any but the gentlest flight conditions. Attachment: engine mount.jpg
...and at +6g, that engine will weigh 1,428 lbs. The picture of that engine mount looks like it would be too weak to be a bicycle rack on the back of an SUV.
Dan
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Post subject: Re: Darkaero? Posted: 06 Jan 2020, 21:41 |
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Joined: 03/01/18 Posts: 845 Post Likes: +611
Aircraft: V35
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We should include the Darkaero crew in the discussion so they can address the issues BEFORE production
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Post subject: Re: Darkaero? Posted: 06 Jan 2020, 22:42 |
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Joined: 06/01/16 Posts: 453 Post Likes: +340 Location: Citrus County Florida
Aircraft: Shopping
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Did anyone bother to download the engine installation PDF? I did, look on page 20, you might be surprised at what you will find. It does not make me feel any different about how I think the mount is attached to the airframe but does explain why the attachment to the engine looks the way it does.
_________________ Anthony Dennis
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Post subject: Re: Darkaero? Posted: 06 Jan 2020, 23:50 |
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Joined: 11/22/12 Posts: 2572 Post Likes: +2330 Company: Retired Location: Lynnwood, WA (KPAE)
Aircraft: 1993 Bonanza A36TN
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Username Protected wrote: Did anyone bother to download the engine installation PDF? I didn't find that on the DA site. Got a link?
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Post subject: Re: Darkaero? Posted: 07 Jan 2020, 13:45 |
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Joined: 06/01/16 Posts: 453 Post Likes: +340 Location: Citrus County Florida
Aircraft: Shopping
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Username Protected wrote: Thanks for the link. It shows that the engine mounting is four bolts at the back of the engine, which is fine, but nobody wondered where the mounting points were, all of the concerns were that it doesn't look strong enough. That diagram doesn't address those concerns at all. I was not saying it did, the install manual says - "The design of the engine mount must take into account the structural loadings" it also goes on to say there is a front mount available which is why the mount looks the way it does. I agree it appears to be fragile but it is really no different than the way the wings are attached on a Bonanza, still 4 bolts holding it on.
_________________ Anthony Dennis
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Post subject: Re: Darkaero? Posted: 07 Jan 2020, 13:59 |
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Joined: 08/24/13 Posts: 8409 Post Likes: +3662 Company: Aviation Tools / CCX Location: KSMQ New Jersey
Aircraft: TBM700C2
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Username Protected wrote: Thanks for the link. It shows that the engine mounting is four bolts at the back of the engine, which is fine, but nobody wondered where the mounting points were, all of the concerns were that it doesn't look strong enough. That diagram doesn't address those concerns at all. I was not saying it did, the install manual says - "The design of the engine mount must take into account the structural loadings" it also goes on to say there is a front mount available which is why the mount looks the way it does. I agree it appears to be fragile but it is really no different than the way the wings are attached on a Bonanza, still 4 bolts holding it on.
It is completely different.
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