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Looping a lynx - control inputs?

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Looping a lynx - control inputs?

Old 31st Jul 2008, 22:32
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Looping a lynx - control inputs?

I enjoyed watching the Blue Eagles at Middle Wallop on Saturday.

Curious - can anyone explain the control inputs needed for the back flip from high hover?

Imagine being the first person to try that!

The usual "don't try this at home or in a R22" apply....
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Old 31st Jul 2008, 22:42
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Not sure on the inputs required for a lynx....but model helicopters are thus:

Collective up (Lots of power), cyclic back to drop tail, as aircraft starts to rotate past about 90 degrees, drop collective back down and allow the aircraft to flop backwards (Upside down)....again once the aircraft has rotated far enough, bring the power back up to pull the ship round to level(hopefully the right way up)...
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Old 31st Jul 2008, 22:56
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Thanks, I've got a check ride coming up soon - that'll impress the examiner
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Old 31st Jul 2008, 23:36
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Mmmmm ....

I believe the major control inputs involve the tightening of the sphincter muscles!


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Old 1st Aug 2008, 00:15
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The fun starts when you exit the flip facing the wrong way... They don't always go to plan.
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Old 1st Aug 2008, 04:13
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The fun starts when you exit the flip facing the wrong way... They don't always go to plan.
Just make sure your harness is secure.......
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Old 1st Aug 2008, 04:23
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Forget the harness....just put a nice shiny trailer hitch ball in the middle of the seat....the "Look Ma! No Hands!" mod!
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Old 1st Aug 2008, 05:18
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Before you do the display you check on the ground that you can get absolutely full aft cyclic without any restrictions such as the 5 point harness buckle getting in the way.

For the manoeuvre it is 1000' in the hover (some prefer a gentle climb) ideally into wind, ASE out (the gyros will topple anyway) but with the yaw channels in for stability, a deep breath and then full aft cyclic with some left as well to oppose the pitch roll couple that occurs on the Lynx. Hold it and look up for the horizon (just like looping a FW) and then you start to feed in forward cyclic to compensate for flapback. The extra drag on the TOW booms helps control the speed on exit.

It can be done from 1000' hover and recovered to a 700' hover for a second go but it's a lot of 'G' and rattling.

If you can manage to say 'Howaayyy ya foooka' in a Geordie accent as you initiate the manoeuvre then you get extra style marks
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Old 1st Aug 2008, 11:17
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then you get extra style marks
When was style ever associated with Geordieland?
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Old 1st Aug 2008, 11:21
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Imagine being the first person to try that!

I stand to be corrected on this, but I believe this 'back flip' is credited to an old mate of mine Ray Turner (AAC).
Got to admit it looks BRILL from the ground but, apparently, is "quite interesting" from inside!
Just had my 6 monthly and altough I did need to impress my examiner - I didn't try this one!


Does anybody know how to fly this thing?
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Old 1st Aug 2008, 13:30
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It feels odd because, unlike a loop where you go up before you go down, with a back flip you just fall out of the sky backwards - almost the most fun you can have with your clothes on
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Old 1st Aug 2008, 15:27
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If this is no more than a flip-over then is there any reason why it has to be done backwards? Why not a bunt?
So, you're in the hover at 1000' and sharply push the cyclic forward as far as it will go, and hold it there until the world's the right way up again. Yeah. Right.
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Old 1st Aug 2008, 17:12
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Danger

Well it works in Bolkov... well half of it

YouTube - Raab in Gefahr beim Hubschrauberkunstflug
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Old 1st Aug 2008, 18:25
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So, you're in the hover at 1000' and sharply push the cyclic forward as far as it will go, and hold it there until the world's the right way up again. Yeah. Right.
Rainer Wilke, the pilot of the Red Bull 105, is planning to do that. As he said lately in a TV-Spot, it should be possible, they made calculations together with ECD to approve it....
Im looking forward to see the coming videos

skadi
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Old 1st Aug 2008, 20:09
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Well that display makes Dennis K's look like a stroll in the park !!!!
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Old 1st Aug 2008, 21:53
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Hoping the Red Bull Team do this again on Sunday


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Old 1st Aug 2008, 23:22
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I stand to be corrected on this, but I believe this 'back flip' is credited to an old mate of mine Ray Turner (AAC).
I heard it was down to Graham Waddington - not that I would wish to steal anything from Ray, who's done very well for a former 'rag-and-shag' bloke.

Another mate, John Carr, offerred to take me along for a demo during my Lynx course. It was veto'd by the grown-ups, although I'm not sure if they were trying to protect me or prevent me from getting ideas above my station.

Personally, I think it's a very impressive move.
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Old 2nd Aug 2008, 00:55
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G.W. told me back in May that he was the first person to carry out this maneuver.
He was not shooting the sh1t, but the tale came out as a follow up to the conversation we where having, we had not seen each other since we both served on the same Sqn 20 years before.
john
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Old 2nd Aug 2008, 07:56
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Yes - just imagine - full forward cyclic, losing height quite quickly; 90 deg nose down, really going down quick now; inverted but still going down very very fast, where did that 1000 feet go? Not to mention the negative 'G' and the fact that both the engines would have been starved of oil and blown up.

I suspect that the Red Bull pilot will do it from a high rate of vertical climb or from climbing backwards flight. Good luck

Back to the flip, so to speak, I believe it was GW and others who started off doing a version of the manoeuvre to get from the high hover (NI Ops) down to low level quickly, a sort of 'over the shoulder' transition. Then it was a case of well if it will do that, will it do this? and the back flip was born.
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Old 2nd Aug 2008, 16:40
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During the Eurocopter Tiger visit to Australia in 98 or 99, the pilot flipped the Tiger in a backwards loop from the hover (kind of over the shoulder ) back to the hover from no more than 200ft ht. Very impressive.
Then the tiger was crashed near Townsville a week or so later.
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