Search found 14 matches

by nmcalba
Fri Feb 14, 2020 6:11 pm
Forum: Technical/Operations
Topic: Derating a turboprop engine
Replies: 22
Views: 1913

Re: Derating a turboprop engine

The specifications for the 737 NG include a line in the performance table specifying "Cruise Max Thrust" - I have never noticed this before. The actual figures are 5,960 lbf (at FL350, mach 0.8) which is only 22% of the rated take-off thrust for a CFM56-7B.... The fuel consumption does no...

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by nmcalba
Fri Feb 14, 2020 12:05 pm
Forum: Technical/Operations
Topic: Derating a turboprop engine
Replies: 22
Views: 1913

Re: Derating a turboprop engine

77% seems pretty high, at least compared to turbofans which operate at what, maybe 10% in cruise? Turbofans operate at fairly high power settings in cruise - way more than 10% Think about it - even a 4 engined aircraft like a 747 will drift down if it loses an engine at cruise altitudes. The actual...

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by nmcalba
Thu Feb 13, 2020 1:57 pm
Forum: Technical/Operations
Topic: Derating a turboprop engine
Replies: 22
Views: 1913

Re: Derating a turboprop engine

77% seems pretty high, at least compared to turbofans which operate at what, maybe 10% in cruise? Turbofans operate at fairly high power settings in cruise - way more than 10% Think about it - even a 4 engined aircraft like a 747 will drift down if it loses an engine at cruise altitudes. The actual...

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by nmcalba
Sat Jan 25, 2020 7:57 pm
Forum: Civil Aviation
Topic: Boeing 777-9 first flight 25 January 2020
Replies: 970
Views: 79354

Re: Boeing 777-9 first flight 25 January 2020 at 10am (weather permitting)

According to FR24 currently orbiting over the little town of Leahy, Washington - mildly amusing synchronicity. [Edit] - Looking at google maps "little town" is a a bit of an overstatement - Leahy appears to consist of 2 sheds - but it does appear on the FR24 map. Maybe they are testing th...

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by nmcalba
Sat Jan 25, 2020 7:36 pm
Forum: Civil Aviation
Topic: Boeing 777-9 first flight 25 January 2020
Replies: 970
Views: 79354

Re: Boeing 777-9 first flight 25 January 2020 at 10am (weather permitting)

According to FR24 currently orbiting over the little town of Leahy, Washington - mildly amusing synchronicity.

[Edit] - Looking at google maps "little town" is a a bit of an overstatement - Leahy appears to consist of 2 sheds - but it does appear on the FR24 map.

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by nmcalba
Wed Oct 30, 2019 8:27 pm
Forum: Technical/Operations
Topic: Why are turboprops so named ?
Replies: 56
Views: 8270

Re: Why are turboprops so named ?

I had a quick search through the archives of Flight magazine to see when the term turbo-prop was first used. The first reference I could find was from Dec 1946 - which talks about the "The Hadley Page Hermes with four Bristol Theseus turbo-props" There were quite a few references to turbop...

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by nmcalba
Mon Sep 30, 2019 10:04 pm
Forum: Civil Aviation
Topic: Thomas Cook Bankruptcy Discussion Thread
Replies: 1315
Views: 212134

Re: Thomas Cook Bankruptcy Discussion Thread

If your aircraft has been seized and you disagree with this, then you go to court and get an order for its release although you'll almost certainly have to pay outstanding charges. If you try and grab back the aircraft without proper paperwork you'll be in all sorts of trouble. For one thing every ...

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by nmcalba
Sun Jul 21, 2019 11:32 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q3 2019
Replies: 4380
Views: 648083

Re: Boeing 737MAX Grounded Worldwide Q3 2019

The discussion about the total costs of the grounding is interesting, if somewhat futile - since the true answer is "no-one knows" - not even Boeing. They have estimates and best guesses - but until the dust has settled that's all they are - and even after the event it may not be possible ...

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by nmcalba
Sat Jun 22, 2019 1:25 am
Forum: Civil Aviation
Topic: Finnair proposes Kathmandu-Helsinki flights
Replies: 42
Views: 8625

Re: Finnair proposes Kathmandu-Helsinki flights

Interesting, I wonder how big the market from Nepal to North America is and if there is commercial sense to go after them. Haha, you wrote pretty much the same I was going to :lol: Small & guess what the majority of that tourism is bound for in Nepal? The Mountain, where there are log jams of t...

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by nmcalba
Sat Jan 19, 2019 9:18 am
Forum: Civil Aviation
Topic: ANA 787 suffers double engine failure on rollout
Replies: 36
Views: 16595

Re: ANA 787 suffers double engine failure on rollout

Reading between the lines of a couple of posts elsewhere it seems that a possible cause of this roll back was a system called TCMA (Thrust Control Malfunction something-or-other). This is a function of the FADEC on many Boeing aircraft and is designed to shutdown one or both engines if it thinks th...

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by nmcalba
Sat Jan 19, 2019 8:12 am
Forum: Civil Aviation
Topic: ANA 787 suffers double engine failure on rollout
Replies: 36
Views: 16595

Re: ANA 787 suffers double engine failure on rollout

Reading between the lines of a couple of posts elsewhere it seems that a possible cause of this roll back was a system called TCMA (Thrust Control Malfunction something-or-other). This is a function of the FADEC on many Boeing aircraft and is designed to shutdown one or both engines if it thinks tha...

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by nmcalba
Sun Oct 07, 2018 2:04 am
Forum: Civil Aviation
Topic: Will UA ever relaunch the RTW flight?
Replies: 43
Views: 5832

Re: Will UA ever relaunch the RTW flight?

with the distance requirement is a 2 stop RTW trip possible using currently scheduled services? If you mean two connections, then as I recall LAX-Dubai-SYD-LAX is legit. Thanks - I had forgotten that Emirates flew to the West Coast USA. Certainly by GC routes then this would meet the requirements o...

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by nmcalba
Sat Oct 06, 2018 1:20 pm
Forum: Civil Aviation
Topic: Will UA ever relaunch the RTW flight?
Replies: 43
Views: 5832

Re: Will UA ever relaunch the RTW flight?

A previous poster mentioned Sydney - Delhi - San Francisco - Sydney as a two stop RTW route - I don't think this is - its more a "round the pacific route" as unless the Delhi -San Francisco leg goes a long way off the GC route it goes the wrong side of the north pole. It did get me thinkin...

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by nmcalba
Tue Aug 21, 2018 10:47 am
Forum: Civil Aviation
Topic: Will air to air refueling ever be a thing in commercial aviation?
Replies: 42
Views: 4214

Re: Will air to air refueling ever be a thing in commercial aviation?

Interestlingly it has been done. There was a short-lived commercial long haul service that used air-to-air refuelling - in 1939. At the time Britain had a problem, its long range flying boats were primarily designed for the African and Indian runs using multiple shot hops between lakes and other sui...

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