Search found 12 matches

by IgorD
Tue Oct 08, 2019 9:08 pm
Forum: Civil Aviation
Topic: October 7, 2019: KLM is 100 years old!
Replies: 44
Views: 5118

Re: October 7, 2019: KLM is 100 years old!

Van harte gefeliciteerd, KLM! Ik ben trots op jullie!

Here's to another 100 years!

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by IgorD
Wed Sep 11, 2019 1:09 pm
Forum: Technical/Operations
Topic: 787 vs A350 range
Replies: 457
Views: 94432

Re: 787 vs A350 range

Hi Fred, thanks, very interesting! Your model predicts a 2% fuel burn diffence for equal weights and SFCs, which is in agreement with my model, where I have an error margine of a few percent. Once the models are calibrated & validated it is rather easy to answer essentially all questions on what...

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by IgorD
Tue Sep 10, 2019 3:54 pm
Forum: Technical/Operations
Topic: 787 vs A350 range
Replies: 457
Views: 94432

Re: 787 vs A350 range

Thomas, I appreciate your critique! But let me explain some things where we differ. First, FCOM is an official document. It provides datapoints on fuel burn at certain weights and altitudes. When I put these datapoints into a regression, it looks like x = ab + c, where x is fuel burn, a is a coeffic...

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by IgorD
Tue Sep 10, 2019 2:32 pm
Forum: Technical/Operations
Topic: 787 vs A350 range
Replies: 457
Views: 94432

Re: 787 vs A350 range

And what makes you think it is 1/38th for both? Airbus did stick some 15 feet more wing onto for a reason, i would think they did so to burn less fuel. I would also assume that effective wingspan wise that should even be more of a difference. Plus of course, from the publicly available data OEW may...

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by IgorD
Tue Sep 10, 2019 1:13 pm
Forum: Technical/Operations
Topic: 787 vs A350 range
Replies: 457
Views: 94432

Re: 787 vs A350 range

My model estimates an average fuel burn for B781 of 5,9 ton/hour for a payload of 57 ton and a flight length of 9 hours (circa 4290 nm still air, ISA conditions, landing with 8,5 ton reserves). Takeoff at 254 and landing at about 201 ton. The 781 will burn 5,1 ton per hour on a 9 hour flight with fu...

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by IgorD
Tue Sep 10, 2019 1:03 pm
Forum: Technical/Operations
Topic: 787 vs A350 range
Replies: 457
Views: 94432

Re: 787 vs A350 range

Zeke, my point is that both types (B787 and A359) burn around 1/38 of their gross weight per hour in flight at LRC speed, optimum altitude and ISA temps. Speed or temperature deviation or change would affect both types equally. Assuming same DOWs of 781 and 359 (which is reasonable giving your datap...

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by IgorD
Sun Sep 08, 2019 8:28 pm
Forum: Technical/Operations
Topic: 787 vs A350 range
Replies: 457
Views: 94432

Re: 787 vs A350 range

Where was that datum sourced? It was posted on this site (possibly even up-thread). The flight in question occurred on 14 February 2019. The specifics posted: TOW: 237,520kg Payload: 26,000kg (226 passengers + 3800kg cargo + 3900kg bags) ZFW: 161,090kg Flight Time: 13:41h Trip Fuel: 71,440kg (1678k...

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by IgorD
Wed Aug 07, 2019 11:31 pm
Forum: Civil Aviation
Topic: Confirmed: KLM Orders/Leasing 2 x 777-300s and Converts 789s to 10s
Replies: 127
Views: 21527

Re: KLM Orders/Leasing 2 x 777-300s (unconfirmed) and Converts 789s to 10s (confirmed)

Noise is hard to generalize, it depends indeed on where you seat and your own perception. In my experience, it also depends pretty much on the speed: a 77W flying at M.813 is very quiet, much quieter than anything else flying M.85 or faster. As you do not always have the speed data, comparing noise ...

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by IgorD
Thu Jul 11, 2019 8:51 pm
Forum: Civil Aviation
Topic: LOT News Thread - 2019
Replies: 681
Views: 89502

Re: LOT News Thread - 2019

https://www.afklcargo.com/NL/en/common/ ... /fleet.jsp

Could be that they counted both the bags and freight. But still, if they get 20 ton on average it is a very good load.
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That's a lot! AF-KL show cargo capacity of their 789 to be 20 ton https://www.afklcargo.com/NL/en/common/ ... /fleet.jsp

Could be that they counted both the bags and freight. But still, if they get 20 ton on average it is a very good load.

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by IgorD
Thu Jul 11, 2019 7:57 pm
Forum: Civil Aviation
Topic: LOT News Thread - 2019
Replies: 681
Views: 89502

Re: LOT News Thread - 2019

Guys, do you have any data on LOT's load factors, across their overall network and the European one? It seems they don't publish any usefull traffic statistics. According to one article I found the overall load factor was 78% in 2017 with the most profitable routes being Tokyo 80% and Seoul 85%. An...

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by IgorD
Wed Jul 10, 2019 8:59 pm
Forum: Civil Aviation
Topic: LOT News Thread - 2019
Replies: 681
Views: 89502

Re: LOT News Thread - 2019

Guys, do you have any data on LOT's load factors, across their overall network and the European one? It seems they don't publish any usefull traffic statistics. Firstly, welcome to the forum (or rather first post). Unfortunately as a government owned airline LOT picks and chooses what data it publi...

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by IgorD
Wed Jul 10, 2019 7:34 pm
Forum: Civil Aviation
Topic: LOT News Thread - 2019
Replies: 681
Views: 89502

Re: LOT News Thread - 2019

Guys, do you have any data on LOT's load factors, across their overall network and the European one? It seems they don't publish any usefull traffic statistics.

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