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Old 02-21-2021, 01:20 AM   #1 (permalink)
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flying car company in Edmonds, WA

I've always been a fan of Coanda (and Bernoulli)



So the thrust is augmented by 15x, the box wing is optimal for it's span, complete laminar flow?

All it needs now is a 3D printed infill in the structure that's post-tensioned by evacuating the air.

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Old 02-22-2021, 11:21 AM   #2 (permalink)
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A box wing has many efficiencies, but I suspect this wing is sized for some other requirement like storage.

Laminar? No por donde, Jose. Not even close, but I might accept 40%.
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Old 02-22-2021, 01:51 PM   #3 (permalink)
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I think the front canard resembles a F1 racecar wing.
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Old 02-22-2021, 02:57 PM   #4 (permalink)
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Well, I like the engine input flow strakes, other than that it just looks like someone's long EZ pipe dream
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Old 02-22-2021, 03:05 PM   #5 (permalink)
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Reminds me of the Annular Jet principal for cushion lift on some early skirtless hovercraft designs.



https://www.sciencedirect.com/topics...ing/hovercraft
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Old 02-22-2021, 03:51 PM   #6 (permalink)
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What would you think of pedestrian-friendly thrusters/propulsors for a hovercraft?
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Old 02-22-2021, 05:11 PM   #7 (permalink)
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Quote:
Originally Posted by freebeard View Post
What would you think of pedestrian-friendly thrusters/propulsors for a hovercraft?
We think alike, I started immediately thinking how this could be applied to hovercraft thrust.

Efficiency is such a big deal it's hard to beat what's out there.

Safety, noise, control and lower overall profile (to get under bridges) and other factors certainly are areas for improvement.

In the end; weight (efficiency) and skirt longevity factors (maintenance overhead) rule the day.

For the military, getting somewhere in the middle of the night during a ruckus storm for cover is idea, and hovercraft fall short in many ways. They just don't like heavy seas.

If this type of propulsion has an advantage in high winds by lowering the profile and having less moving parts giving off a radar signature or sucking sailors into fans (they cover the LCAC propellers with big nets now) then I can see this technology being put to future use.
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Old 02-22-2021, 06:18 PM   #8 (permalink)
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How does one know if a design that falls out of the traditional teardrop shape truly has attached flow in areas that are suspect, or if what we see is the result of the Coanda Effect ?
I'm guessing that the Coanda Effect needs some sort of additional surface outside if the main bodywork that the air sticks to. So the effect could be possible if induced by a gapped spoiler device, but not on a car without it. ( Example : something like the spoilers at the edge of minivans that has an air gap that draws in the air and sends it down the back window, versus a car that has no spoilers. )
Would this assumption be true ?

Edit : On second thought, I have seen a video of the Coanda Effect, in which a guy places a wine bottle in front of a candle and blows the front of the bottle which has the candle behind.
The air flows around the bottle, and blows out the candle.
No additional planes are present around the bottle to create this effect, so it seems this effect could be present without the use of (ducted ) spoilers on a car, and the effect could be seen over a normal roofline.

I'm so confused.

Last edited by Cd; 02-22-2021 at 07:00 PM..
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Old 02-22-2021, 09:01 PM   #9 (permalink)
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Ha! I think I'm not confused.

I don't think the ping pong ball floating on the vacuum cleaner hose is Coanda Effect. Possibly Bernoulli.

The reason I say that I understand that Coanda was trying to put an afterburner in a piston engine exhaust. Adding energy to the exhausted air. It seems to work better with a turbojet.

Another possibility is Shauberger's trout submarine.

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Old 02-22-2021, 11:26 PM   #10 (permalink)
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I'll have to circle back to this when I can watch with sound.

I'd like to see a powerful ion engine capable of massive thrust powered by a nuclear source. Once a decade type of refueling.

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