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19 May 2022, 18:47 [ UTC - 5; DST ]


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 Post subject: Re: Darkaero?
PostPosted: 24 Jun 2021, 22:48 
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Joined: 01/06/08
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Aircraft: B55 P2
There is always the question on whether it has enough cooling. Engine cooling generates a lot of drag, but no no one really wants to cruise around with >450F CHTs even if that is technically legal by the POH

Username Protected wrote:
It's ~10% than a Lancair 360 and has 10% more power, and looks like significantly less cooling drag. That's not going to equal a 40 mph speed boost, but it will be a boost. If the engine mount and the aileron torque tubes are robust enough (those are the only items that look questionable to me), my money is on about 250 mph.

But I also bet that after they fly it for a year they find a bunch of things that need to be beefed up and add another 100 pounds.


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 Post subject: Re: Darkaero?
PostPosted: 24 Jun 2021, 22:55 
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Joined: 01/23/13
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Company: Kokotele Guitar Works
Location: Albany, NY
Aircraft: C-182RG, C-172, PA28
They have one or two videos about the plenum they've designed and their overall cooling scheme. It looks more carefully designed than any other plane in this class, so I'm hopeful for them that it means they did it well.


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 Post subject: Re: Darkaero?
PostPosted: 25 Jun 2021, 07:02 
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Joined: 07/11/12
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Company: Mark Travis & Company, Inc
Location: Atlanta, GA (KPDK)
Aircraft: 1970 Baron B55
Username Protected wrote:
What does the BT Brain Trust think of the 275 mph cruise prediction at 11 gph for the DarkAero?


Take a look at the GP-4. https://www.ospreyaircraft.com/gp4.htm

There are a couple of builders who have gotten close to those numbers.

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 Post subject: Re: Darkaero?
PostPosted: 13 Jul 2021, 16:38 
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Joined: 09/16/10
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Aircraft: A36
Looks like an expensive lawn dart.

That being said kudos to these guys for trying. They need to give up some airspeed and make it as pilot friendly as possible or they will be tied up in litigation and bankruptcy court.


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 Post subject: Re: Darkaero?
PostPosted: 04 Jan 2022, 13:36 
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Aircraft: C182R
https://youtu.be/juywHctMIhI

They have it together and on its own gear for the first time.


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 Post subject: Re: Darkaero?
PostPosted: 04 Jan 2022, 13:43 
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Joined: 07/01/19
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Aircraft: In market
I found out this summer that a friend’s son works for DarkAero as an engineer. I am hoping it succeeds for his sake.


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 Post subject: Re: Darkaero?
PostPosted: 04 Jan 2022, 14:01 
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Location: Milwaukee WI
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I really like those guys and that is one cool airplane and I wish then nothing but success but I think I would risk a groin pull getting up on that wing.


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 Post subject: Re: Darkaero?
PostPosted: 04 Jan 2022, 15:31 
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Username Protected wrote:
I really like those guys and that is one cool airplane and I wish then nothing but success but I think I would risk a groin pull getting up on that wing.


I've watched a lot of their videos, and I don't think they've ever mentioned how you get into it. Will be interesting to see.

A bunch of us had misgivings about their engine mount, but they've since revised it. The only other thing that gives me pause now is the split rudder. They cite some really old designs (including the original Beech 17) as justification, but I suspect they're going to wind up changing it eventually.

I'm excited to see their progress. Even if it doesn't meet all of their design goals, we're talking about a handful of kids, pretty fresh out of school, who have figured out how to fund their own little design and fabrication shop to build an airplane from their imaginations.

That's pretty incredible.


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 Post subject: Re: Darkaero?
PostPosted: 04 Jan 2022, 15:44 
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Joined: 10/29/15
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Aircraft: PA-28r
unlike a lot of the vaporware designs we've seen recently, these guys seem to have a lot of engineering talent and are taking a very methodical approach to this project rather than just hiring a graphic designer to make some cool renderings.


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 Post subject: Re: Darkaero?
PostPosted: 04 Jan 2022, 23:41 
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Aircraft: Seabee Aerostar 700
very cool as my Dad used to say (he was a brilliant design engineer with a very practical viewpoint)

"Make a model/ prototype and test it . then you really know if you are doing things right."

I am impressed that they actually are building something and testing it.


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 Post subject: Re: Darkaero?
PostPosted: 05 Jan 2022, 09:03 
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Joined: 02/28/17
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Location: Panama City, FL
Aircraft: Velocity XL-RG
I think that if they had put a slightly larger wing on it and gotten the stall speed down while keeping the cruise speed above 200kts, they would have a much more desirable airplane.

That 70kt stall speed could be a problem for sales. I'm guessing that's something insurance companies consider when determining the premium.


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 Post subject: Re: Darkaero?
PostPosted: 05 Jan 2022, 10:53 
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Joined: 12/03/14
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Company: Ciholas, Inc
Location: KEHR
Aircraft: C560V
Username Protected wrote:
That 70kt stall speed could be a problem for sales.

Yes, that's too high.

My Citation V, at 11,000 lbs which is a very normal landing weight, stalls at 70 knots.

High stall speed will hurt runway performance, climb, and high altitude performance. A little extra wing may cost a few knots, but will make it an overall better airplane.

Mike C.

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 Post subject: Re: Darkaero?
PostPosted: 05 Jan 2022, 11:00 
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Joined: 05/11/10
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Location: KFIN Flagler, FL
Aircraft: 1991 Bonanza A36
Is there any information on how much runway is required to achieve 70 knots?

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 Post subject: Re: Darkaero?
PostPosted: 05 Jan 2022, 11:36 
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Joined: 02/28/17
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Location: Panama City, FL
Aircraft: Velocity XL-RG
Username Protected wrote:
That 70kt stall speed could be a problem for sales.

Yes, that's too high.

My Citation V, at 11,000 lbs which is a very normal landing weight, stalls at 70 knots.

High stall speed will hurt runway performance, climb, and high altitude performance. A little extra wing may cost a few knots, but will make it an overall better airplane.

Mike C.

I would not be surprised if the landing distance is relatively short. That airplane is pretty light so I'm guessing it could stop fairly quick.

Correction: The specs say it stalls at 70MPH. So 60kts... Still too fast IMO for an airplane of that size.

<rant> I don't know why they use MPH instead of knots other than to get a more impressive sounding cruise speed. </rant>

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 Post subject: Re: Darkaero?
PostPosted: 05 Jan 2022, 11:39 
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Joined: 05/13/14
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Location: Central Texas (KTPL)
Aircraft: '78 Bonanza A36
Username Protected wrote:
Correction: The specs say it stalls at 70MPH. So 60kts... Still too fast IMO for an airplane of that size.
No matter how diligent they are, changes will be made after flight testing. But I applaud them targeting high speed, instead of just doing what many other kits will do.

I'm very interested in this kit. Wish it had A/C and a ballistic chute too, but it's still very compelling.


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