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Aussie Ekranoplan-hovercraft

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Aussie Ekranoplan-hovercraft

Old 5th Apr 2019, 03:53
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Aussie Ekranoplan-hovercraft

This is just hilarious; well actually it's a bit scary given he's only wearing a baseball cap and not a helmet.
Not so much Caspian Sea-Monster - more Timor Sea Monster?
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Old 5th Apr 2019, 05:44
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Good on him. Fantastic.
Stand by for complaints - didn’t have any yellow cones deployed, no traffic marshalls, etc.
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Old 5th Apr 2019, 06:02
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Old 5th Apr 2019, 06:14
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He shows remarkable flying skill but isn't that thing a flying coffin? Yes, ingenious yet I worry it is not going to end well. Sorry to be such a misery...
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Old 5th Apr 2019, 08:59
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It'll be ok, he's got ear-defenders on. Or is he switched on, tuned in and listening to Kylie?
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Old 5th Apr 2019, 09:22
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Well done him! Perfect use of thrust and ground effect.
If that is his first attempt I can see it getting better.
Although a life jacket and helmet with possibly a roll cage would defo help!
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Old 5th Apr 2019, 10:01
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Originally Posted by Spunky Monkey View Post
Well done him! Perfect use of thrust and ground effect.
If that is his first attempt I can see it getting better.
Although a life jacket and helmet with possibly a roll cage would defo help!
I could not see any; could anyone see any ailerons?
If it dips a wing at speed it could get a bit hairy.
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Old 5th Apr 2019, 10:04
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I'm pretty sure it's just relying on the natural roll stabilisation from being in ground effect (where the low wing has greater lift than the high wing), combined with secondary effect from the rudders.
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Old 5th Apr 2019, 10:11
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I like his version of "push and start "....

He should bring it to the UK for Cowes week.....which may upset the purists attending.
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Old 5th Apr 2019, 10:21
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Originally Posted by VP959 View Post
I'm pretty sure it's just relying on the natural roll stabilisation from being in ground effect (where the low wing has greater lift than the high wing), combined with secondary effect from the rudders.
Yes. I took another look.
Not much, if anything at all, supporting the wing skin.
Where's someone with some $$ - there has to be a commercial future, surely. Just at that scale.

If that's in Darwin Harbour he'd also need to keep an eye out for bities.
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Old 5th Apr 2019, 10:52
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Originally Posted by WingNut60 View Post
I could not see any; could anyone see any ailerons?
If it dips a wing at speed it could get a bit hairy.
WIth that config you'd expect reasonably strong yaw/roll coupling (due to blanking of the inboard wing in side-slip) so there's probably decent roll response just from the rudder.

They've done quite a lot of serious work (he's not the only one working on these things) as you can see at this site:

https://www.hovercraft.com/content/i...index&cPath=53

PDR
Some of them are on the hydrofoil/WIGE boundary. The one in the OP has done more than was seen on that first flight video. As in:


PDR
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Old 5th Apr 2019, 13:08
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(Assuming he hasn't) What's the betting some Jobsworth will try and stop him because he hasn't got a pilots licence.
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Old 5th Apr 2019, 15:02
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Begs the question as to what the definition of an aircraft is. Are the America's Cup boats "flying" when they are out of the water on foils? I seem to remember this coming up decades ago when a relation purchased a Boeing Jetfoil to use as a high speed passenger ferry and ran into regulatory problems when trying to undertake sea trials in UK waters (the intention was to base it in Bahrain when in service, so the regulatory stuff may have been in the Gulf, I can't remember now).
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Old 5th Apr 2019, 17:48
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Thread drift but as a nipper in Cowes IoW where the hovercraft was developed I took a keen interest in them.

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Old 5th Apr 2019, 17:57
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There is no doubt that the device in the OP 'flies', but it seems to be the effect of the angle of the wings rather than the aerodynamic lift from the airfoils..
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Old 5th Apr 2019, 18:05
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I remember reading up on the Russian ekranoplanes years ago, and concluding that most of the lift came from the much increased pressure on the underside of the wing, rather than the reduced pressure on the upper side. Wing area, together with a very low aspect ratio, seemed to be far more important than aerofoil section, although IIRC the sections that were most stable included a fair amount of reflex (rather like a hanglider, or flying wing). To overcome the high induced drag from the low aspect ratio, end plates seemed to work as well as winglets, at least at low speeds where their higher form drag wasn't a significant penalty. I'd guess that this craft gets a fair bit of lift from the main body, too, as the area, and AoA, of that looks pretty high in proportion to the wing area. I'd be interested to better understand the forces on the horizontal stabiliser, as I suspect they may be very low, as the tail moment arm is pretty short.
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Old 5th Apr 2019, 18:46
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Goes back to the Do"X" IIRC on its long range flights
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Old 5th Apr 2019, 22:38
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Originally Posted by VP959 View Post
...... To overcome the high induced drag from the low aspect ratio, end plates seemed to work as well as winglets, at least at low speeds where their higher form drag wasn't a significant penalty. ........
The whole concept is about trading drag (water) for drag (air). Unless the aerodynamic drag is significantly less than the water drag on the hull then there's no real point, is there?
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Old 6th Apr 2019, 01:51
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Those worried about the lack of safety (helmet) etc, this took place in Darwin, home of the awards. About the only place in Oz where you don't require a helmet to ride a bike (push), it still has a bit of the frontier spirit.
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Old 6th Apr 2019, 07:46
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Originally Posted by tartare View Post
This is just hilarious; well actually it's a bit scary given he's only wearing a baseball cap and not a helmet.
https://www.youtube.com/watch?time_c...&v=gEtQwYFhZWI
Not so much Caspian Sea-Monster - more Timor Sea Monster?
Nah, she'll be right. He's wearing his industrial thongs (flip flops} and a not-quite-so High Visibility Wifebeater vest, any thing else is just garnish.....
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