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Post by skyhawkdon on Apr 18, 2017 17:57:40 GMT 12
Well handled by the crew by the sound of it. The benefit of having two engines when flying over water! If it had been a Huey...
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Post by beagle on Apr 18, 2017 18:21:32 GMT 12
Yes an extra engine to help maintain full operation after losing one would have been nice in the original design, but that's not what it is. I suppose in a situation with minimal fuel and low all up weight it might have the capability to hover for very short time. Wonder if that was one of the reasons the Merlin went for 3 engines.
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Post by baronbeeza on Apr 18, 2017 18:40:54 GMT 12
Am I reading that article correctly ?
What happened to the screaming and plummeting ?
I think the reporter did a very good job in this instance. In fact I think that has to be exceptional reporting and I would love to know how that came about. Very well done indeed.
If it had been an Iroquois there would not have been a problem, the right engine was running just fine. It was just the surplus one that gave the grief.
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Post by frankly on Apr 18, 2017 20:18:21 GMT 12
Yes an extra engine to help maintain full operation after losing one would have been nice in the original design, but that's not what it is. I suppose in a situation with minimal fuel and low all up weight it might have the capability to hover for very short time. Wonder if that was one of the reasons the Merlin went for 3 engines. RTM 322 02/8 (used in Merlin) is capable of take-off power of 2,270 shp and cruise power of 2,000 shp. Its maximum power in the One Engine Inoperative (OEI) rating is 2,472 shp. RTM 322 01/9 (used in NH90) can deliver take-off power of 2,388 shp and cruise power of 2,231 shp. Maximum power using the One Engine Inoperative (OEI) rating is 2,911 shp. Merlin's a heavier machine with a lower powered engine, so I'd assume the third was necessary to provide a greater margin. Worth noting that the 322 family has well over a million flying hours on it, it's a well proven design (something lost on the Marlborough Express reporter). SaveSave
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Post by beagle on Apr 18, 2017 22:23:52 GMT 12
so they have more power than our ex NATTS F27's
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Post by camtech on Apr 19, 2017 10:15:03 GMT 12
so they have more power than our ex NATTS F27's Yes but a lot of power would be lost in the gearboxes and drives, not delivered directly to the windy thing up top
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Post by ErrolC on Apr 20, 2017 19:25:59 GMT 12
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Post by 30sqnatc on Apr 21, 2017 17:14:54 GMT 12
How many Blue Band Airlines airpoints does it take to get to VIP status?
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Post by saratoga on Apr 22, 2017 11:25:13 GMT 12
Newshub understands the $630 million fleet isn't allowed to fly over water or dangerous terrain, and cannot carry VIPs.
so,they could just about taxi up and down Ohakeas runways? Like the suggestion to get the Hueys out of the museums and back into service, obviously these commentators don't realise they were given away to the US.
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Post by Dave Homewood on Apr 22, 2017 11:45:28 GMT 12
"the $630 million fleet isn't allowed to fly over water or dangerous terrain, and cannot carry VIPs"
That is only while they investigate the engine issue though, right?
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Post by beagle on Apr 22, 2017 15:56:37 GMT 12
I'm assuming so. Will take a wee while for the engine manufacturer to pull down and investigate the components. As TD, AVM Davies said on the radio yesterday, it could have been just something wrong while building that engine that has only just shown up now, or it could be something that a fix to all RTM engines of same model need to have done to them. I dare say over the next week or so we will hear new information.
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Post by noooby on Apr 22, 2017 17:16:19 GMT 12
Can't hover on one engine??
Bollocks. yes it can.
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Post by Dave Homewood on May 8, 2017 16:50:42 GMT 12
Just posted on the RNZAF Facebook page: NH90 flying limitations easedThe Royal New Zealand Air Force has eased limitations on its fleet of twin engined NH90 helicopters that have prevented them flying over water, at night, and over mountainous terrain since 20 April. The limitations were imposed on the fleet after an NH90 suffered a single engine failure on 16 April while returning to RNZAF Base Ohakea from Woodbourne. Detailed investigations by the Air Force have taken place since then. The Chief of Air Force, Air Vice-Marshal Tony Davies, said: “We have approached this in a prudent and measured way, with safety being of paramount importance. “We know now how the aircraft performed with one engine and we are working with the aircraft engine manufacturer to clarify the initial causes of the engine failure. “Those investigations have given us confidence the aircraft can be operated safely following a similar engine failure. Therefore we have returned to normal flying operations, except where the aircraft is operating at its upper weight limits, and plan to return to full operations as soon as the engine manufacturer has determined the reasons for the initial failure.” Since the Chief of Air Force imposed limitations on the NH90 fleet, the helicopters have continued to fly for training purposes around their home base of Ohakea, and were prepared to fly urgent tasks of national significance. medium.com/@nzdefenceforce/nh90-flying-limitations-eased-32adf99ddf44
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Post by phil on May 8, 2017 18:44:07 GMT 12
But that wont get the same coverage as 'NH90s Grounded', most people will just remember the former (and even that was never correct).
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Post by noooby on May 9, 2017 7:05:47 GMT 12
+1 to that phil.
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Post by madmac on May 9, 2017 9:03:24 GMT 12
We know now how the aircraft performed with one engine.
That seems a slightly odd statement.
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Post by camtech on May 9, 2017 10:22:57 GMT 12
Possibly referring to the specific situation - weight, temperature, and all the other variables that determine performance.
I would certainly hope that the single engine performance data is part of pilots notes.
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Post by ErrolC on May 9, 2017 10:31:31 GMT 12
Possibly referring to the specific situation - weight, temperature, and all the other variables that determine performance. I would certainly hope that the single engine performance data is part of pilots notes. I would hope it is one of the things they practice in the simulator!
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Post by ErrolC on Jun 13, 2017 20:24:22 GMT 12
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Post by joey05 on Jun 14, 2017 11:35:57 GMT 12
Didn't the Aussies change the base model specs quite substantially? Seems they are having more issues than those (like RNZAF) using standard "off the shelf" version!
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