28 Mar 2024, 12:19 [ UTC - 5; DST ]
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Post subject: Re: Darkaero? Posted: 05 Sep 2020, 15:57 |
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Joined: 01/04/17 Posts: 107 Post Likes: +35
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Nice to see the Darkaero guys load test their wing. They also mentioned that during the test they were verifying that the ailerons still worked under load.
Seems like they are taking a systems engineering approach to design and development.
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Post subject: Re: Darkaero? Posted: 05 Sep 2020, 17:13 |
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Joined: 10/05/11 Posts: 9552 Post Likes: +6409 Company: Power/mation Location: Milwaukee, WI (KMKE)
Aircraft: 1963 Debonair B33
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Go to the 2:30 or so mark on this vid. https://youtu.be/WamtmKiDIKsI don't get how they are transmitting torque effectively in that manner. I would expect aero loads to easily displace one end of that tube. I would have expected to see push/pull tubes. Thoughts?
_________________ Be Nice
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Post subject: Re: Darkaero? Posted: 06 Sep 2020, 08:53 |
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Joined: 08/24/13 Posts: 8406 Post Likes: +3662 Company: Aviation Tools / CCX Location: KSMQ New Jersey
Aircraft: TBM700C2
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Username Protected wrote: I don't get how they are transmitting torque effectively in that manner. I would expect aero loads to easily displace one end of that tube.
I would have expected to see push/pull tubes.
Thoughts? Agreed
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Post subject: Re: Darkaero? Posted: 06 Sep 2020, 11:21 |
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Joined: 01/04/17 Posts: 107 Post Likes: +35
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Attachment: Presentation1.pdf Username Protected wrote: Go to the 2:30 or so mark on this vid. https://youtu.be/WamtmKiDIKsI don't get how they are transmitting torque effectively in that manner. I would expect aero loads to easily displace one end of that tube. I would have expected to see push/pull tubes. Thoughts? See attached screen shot of the push/pull tubes they are using to activate the ailerons. They can change the force required to move the ailerons by moving the lever arms on the brackets in the flight control system. The attachment on the wing is pretty beefy, it looks like at least 1/4 inch thick graphite and the aluminum bracket looks just as large.
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Post subject: Re: Darkaero? Posted: 06 Sep 2020, 12:33 |
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Joined: 01/04/17 Posts: 107 Post Likes: +35
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The amount of force as well as flutter margins are managed by how the ailerons are balanced. Some ailerons use aerodynamic force for balance others use a mass balance weight.
The ailerons on Darkaero have a mass balance weight ahead of the hinge line which helps determine the force required to move the aileron.
See the attached pics...
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Post subject: Re: Darkaero? Posted: 06 Sep 2020, 12:50 |
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Joined: 11/11/17 Posts: 1159 Post Likes: +1818 Location: KOLV
Aircraft: A36, 767
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Traditional tubes are used in pure compression/tension push/pull roles. Those in the video are used to transmit a rotational load from the hinge point inboard of the flap to the hinge point outboard of the flap, but off axis - pure moment load. For that design to work, there has to be zero angular deflection at the joint on either end of the tube due to the resultant moments. From the video, I don't see how that's possible. Why wouldn't they just have mounted the tube centered on the hinge points so that it's a rotational/torsional load (which a torque tube resists very well) vs a translational movement with moment loads at the tube/plate joint like they did for the aileron torque tubes inside the fuselage?
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Post subject: Re: Darkaero? Posted: 06 Sep 2020, 20:39 |
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Joined: 08/08/16 Posts: 700 Post Likes: +222
Aircraft: A36 :-)
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Did you notice, it is not meant to fly, it is a boat? They talk range in sea miles - 1,700sm, not nautical miles .
_________________ 'Speak your mind even if you are a minority of one, the truth is still the truth.' Mahatma Gandhi
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Post subject: Re: Darkaero? Posted: 06 Sep 2020, 22:05 |
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Joined: 06/25/10 Posts: 13096 Post Likes: +19119 Company: Keybilly Adventures Location: FD51
Aircraft: P35, GC1B
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Username Protected wrote: Did you notice, it is not meant to fly, it is a boat? They talk range in sea miles - 1,700sm, not nautical miles . What kind of boating do you do that’s in statute miles?
_________________ “Fear is the Mind-Killer”
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Post subject: Re: Darkaero? Posted: 24 Jun 2021, 14:14 |
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Joined: 03/27/10 Posts: 331 Post Likes: +196 Location: GTU - Georgetown, Tx
Aircraft: 65 Deb C33, RV-6
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What does the BT Brain Trust think of the 275 mph cruise prediction at 11 gph for the DarkAero?
_________________ B-25 co-pilot RV6 Formation Debonair CFI/CFII/MEI Washed up Fighter Pilot (F-4s, F-16s)
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Post subject: Re: Darkaero? Posted: 24 Jun 2021, 22:12 |
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Joined: 01/06/08 Posts: 4665 Post Likes: +2678
Aircraft: B55 P2
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Its very light (1500 pounds max gross) 2 person, so 200HP will probably let it fly pretty high where efficiency isn't bad. Clean airframe and only a little over 1/2 the weight of a mooney M20J. Wing loading is 23 pounds/square foot, compared to a M20J 14.5. That suggests Stall speed is 60 knots (an M20J is 53 knots) M20J claims 170 knots max cruise. This plane claims 240. The engine claims 105HP at 20,000' That is still higher power to weight than a M20J at 5000'. Even putting all that together 240 KTAS seems high, but not sure its crazy Username Protected wrote: What does the BT Brain Trust think of the 275 mph cruise prediction at 11 gph for the DarkAero?
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