Search found 20 matches

by surrodox2001
Mon May 04, 2020 10:46 am
Forum: Technical/Operations
Topic: CF6-50 start: what is that sound?
Replies: 13
Views: 2298

Re: CF6-50 start: what is that sound?

Ok, that very clear, thanks. Btw, is it the rotating fan that is producing the so characteristic sound of the CF6-50? Are you thinking about the initial start sequence with the whine? It's all present from CF6-6s all the way up to -80E1s (+LM2500) from the videos I heard. No, it's the high-pitched ...

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by surrodox2001
Mon May 04, 2020 3:01 am
Forum: Technical/Operations
Topic: CF6-50 start: what is that sound?
Replies: 13
Views: 2298

Re: CF6-50 start: what is that sound?

SpaceshipDC10 wrote:
Ok, that very clear, thanks. Btw, is it the rotating fan that is producing the so characteristic sound of the CF6-50?


Are you thinking about the initial start sequence with the whine? It's all present from CF6-6s all the way up to -80E1s (+LM2500) from the videos I heard.

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by surrodox2001
Mon May 04, 2020 2:58 am
Forum: Technical/Operations
Topic: CF6-50 start: what is that sound?
Replies: 13
Views: 2298

Re: CF6-50 start: what is that sound?

The noise "growl" you hear at about the 50 sec mark is the harmonics of the flame front when the fuel is introduced. You can see the condensation from the air starter up until the turbine becomes self sufficient to accelerate rotational speed up to idle and the starter is dropped out. The...

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by surrodox2001
Tue Apr 21, 2020 3:35 pm
Forum: Technical/Operations
Topic: 747-200/300 with GE engines...Why the lower fuel capacity?
Replies: 17
Views: 2166

Re: 747-200/300 with GE engines...Why the lower fuel capacity?

The GE engine is longer than PW, so the turbine safety zone is further back in the wing. Just a guess but that’s a factor in other designs.

What about RR? I think RR, PW's engine is also quite long too in terms of complete engine.

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by surrodox2001
Tue Apr 21, 2020 2:54 pm
Forum: Technical/Operations
Topic: 747-200/300 with GE engines...Why the lower fuel capacity?
Replies: 17
Views: 2166

Re: 747-200/300 with GE engines...Why the lower fuel capacity?

Why we're getting a lower fuel capacity with GE? Slightly off topic, the A320 with IAE engines have a slightly less Wing Tank capacity than the CFM counterparts due to the incorportaion of a Dry Bay inside the the Wing cell around the pylon area for additional safety. This can be a reason, however ...

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by surrodox2001
Tue Apr 21, 2020 2:52 pm
Forum: Technical/Operations
Topic: 747-200/300 with GE engines...Why the lower fuel capacity?
Replies: 17
Views: 2166

Re: 747-200/300 with GE engines...Why the lower fuel capacity?

The mentioned Boeing PDF file contains a lot of errors, so far I was able to check on short notice : - Page 23 : 747-200 engines is completely incorrect - Page 24 : 747-300combi (Air india) powered by CF6-80C2B1 engines has also been produced. IMHO an inaccurate copy/paste PR product, not checked a...

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by surrodox2001
Tue Apr 21, 2020 5:57 am
Forum: Travel, Polls & Preferences
Topic: Rare and Short Lived Airline/Aircraft Combinations
Replies: 91
Views: 6991

Re: Rare and Short Lived Airline/Aircraft Combinations

Air India Landor reject livery:



The Indians protested and they got the Taj Mahal on every window old livery back.

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by surrodox2001
Tue Apr 21, 2020 5:53 am
Forum: Travel, Polls & Preferences
Topic: Rare and Short Lived Airline/Aircraft Combinations
Replies: 91
Views: 6991

Re: Rare and Short Lived Airline/Aircraft Combinations

tmu101 wrote:
Wasn't there a Concorde painted with Singapore Airlines color scheme on one side (some sort of arrangement with British Airways if i recall)?


There you go:

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by surrodox2001
Mon Apr 20, 2020 5:00 pm
Forum: Technical/Operations
Topic: 747-200/300 with GE engines...Why the lower fuel capacity?
Replies: 17
Views: 2166

Re: 747-200/300 with GE engines...Why the lower fuel capacity?

mmo wrote:
And the VTO closed at a slightly earlier point.


What's a VTO?

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by surrodox2001
Mon Apr 20, 2020 9:28 am
Forum: Technical/Operations
Topic: 747-200/300 with GE engines...Why the lower fuel capacity?
Replies: 17
Views: 2166

747-200/300 with GE engines...Why the lower fuel capacity?

I assume we're going to get a lower range with this. According to StartupBoeing's 747 classic PDF , Boeing gives a lower fuel capacity (few hundred gallons) for the GE engines in 747-200/300 compared to PW and RR engines. Why we're getting a lower fuel capacity with GE? I don't think engine weight a...

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by surrodox2001
Thu Apr 16, 2020 12:23 pm
Forum: Travel, Polls & Preferences
Topic: Rare and Short Lived Airline/Aircraft Combinations
Replies: 91
Views: 6991

Re: Rare and Short Lived Airline/Aircraft Combinations

DeltaPSCFlyer wrote:
Delta and the 747-100/200 series in the 70's.


Don't forget that Delta also operated Dc-10s twice, 1st time in the 1970s while waiting for the 1011s, second time when they use bought Western Airlines planes.

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by surrodox2001
Sat Apr 11, 2020 4:24 pm
Forum: Technical/Operations
Topic: 747SP fifth pod ?
Replies: 32
Views: 3206

Re: 747SP fifth pod ?

Don't know there's other airlines operated RR 747SPs. Thanks for your data.
But yeah, AFAIK only Qantas operated 747SPs on commercial routes. (I saw a few Saudia on this list, they use them on commercial flights as well?) (The last one is for VIP use I think.)

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by surrodox2001
Sat Apr 11, 2020 10:58 am
Forum: Technical/Operations
Topic: 747SP fifth pod ?
Replies: 32
Views: 3206

Re: 747SP fifth pod ?

747classic wrote:
I have no knowledge of any airline (or operator) actually performed a 5th pod operation at a RR powered 747SP.


In addition to that, only Qantas operated RR powered 747SPs. (VH-EAA, VH-EAB)

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by surrodox2001
Sat Apr 11, 2020 2:29 am
Forum: Technical/Operations
Topic: 747SP fifth pod ?
Replies: 32
Views: 3206

Re: 747SP fifth pod ?

Then why you need to haul a -3 in a -7 equipped 747sp? Plane recovery?
And I'm pretty sure that sucker-door equipped 747s are Stage 1 or 2 (?) and won't pass noise regulations.

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by surrodox2001
Fri Apr 10, 2020 5:41 pm
Forum: Technical/Operations
Topic: 747SP fifth pod ?
Replies: 32
Views: 3206

Re: 747SP fifth pod ?

Anyone know if this sub type was certified for fifth pod engine ferry and if it was ever done ? Syrian 747SP, YK-AHA, 1999-09-01, MUC, with 5th pod installed : https://www.747sp.com/wp-content/gallery/21174-284/21174_yk-aha_old5engines.jpg See : https://www.747sp.com/747sp-production-list/21174-284...

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by surrodox2001
Fri Apr 10, 2020 11:31 am
Forum: Technical/Operations
Topic: Why did Rolls Royce stop making engines for the 777?
Replies: 10
Views: 3026

Re: Why did Rolls Royce stop making engines for the 777?

FYI: RR did make an engine for the 2nd generation 777s.

It's called Trent 8104 (104000lbs thrust?) and made 110000lbs in testing. Making it close to the GE90-110/115s.
But GE came and take all the money away and airlines only have GE on offer.

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by surrodox2001
Fri Apr 10, 2020 11:20 am
Forum: Technical/Operations
Topic: 747SP fifth pod ?
Replies: 32
Views: 3206

Re: 747SP fifth pod ?

Kinda related, what airline does frequently use 5th pod on the 747?

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by surrodox2001
Fri Apr 10, 2020 11:13 am
Forum: Travel, Polls & Preferences
Topic: Douglas/McDD rollouts, why Bagpipes?
Replies: 2
Views: 428

Douglas/McDD rollouts, why Bagpipes?

From 3:06 in https://www.youtube.com/watch?v=pnYuaU6gsig From 0:30 in https://www.youtube.com/watch?v=pnYuaU6gsig Can anyone here that knows about McDD stuff explains why these (at least) Douglas/McDD rollouts have bagpipe songs on them? I'm pretty sure the founder (Donald Douglas) isn't a Scot eith...

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by surrodox2001
Sat Apr 04, 2020 12:26 pm
Forum: Travel, Polls & Preferences
Topic: The most widely used aero engine?
Replies: 1
Views: 280

The most widely used aero engine?

What's the aero engine (jet, turboprop, piston) that's being used on the most types of aircraft?

I'll imagine the CFM56 or JT3 will be the most widely used jet, and PT6 for turboprop.

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