Search found 1058 matches

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by kitplane01
Wed Jan 16, 2019 9:50 pm
Forum: Civil Aviation
Topic: Airlander 10 gets full-production go-ahead
Replies: 22
Views: 3216

Re: Airlander 10 gets full-production go-ahead

What do you gut=ys think of the Airlander 10? Can you see a future for modern airships? Theres a very good interview with the Executive of HAV from Last years RIAT in the article below. https://www.nowscience.co.uk/single-post/2019/01/14/A-new-age-of-airships-is-ready-for-lift-off-as-worlds-longest...

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by kitplane01
Wed Jan 16, 2019 9:41 pm
Forum: Civil Aviation
Topic: Iran's domestic route network
Replies: 34
Views: 3646

Re: Iran's domestic route network

Looking at the route network of THR Airport it seems that Iran has quite an extensive number of airlines and flights operating within its borders. Iran isn't particularly vast nor wealthy and it also is a single mass system. Is it that there are no alternatives to air travel? Excuse me, but your pe...

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by kitplane01
Mon Jan 14, 2019 2:12 am
Forum: Civil Aviation
Topic: Boeing unveils new version of radical wing design
Replies: 141
Views: 25791

Re: Boeing unveils new version of radical wing design

I don't know why you think the A320 wing is the best. I would imagine the A220 and the 787 were both better. The A320 wing is very span constricted. That poster's gimmick is to claim that nothing has improved in commercial aviation, or at least narrowbodies, since the day the A320 entered service. ...

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by kitplane01
Mon Jan 14, 2019 2:06 am
Forum: Civil Aviation
Topic: Boeing unveils new version of radical wing design
Replies: 141
Views: 25791

Re: Boeing unveils new version of radical wing design

Technical questions ... 1) The struts look airfoil shaped. On smaller aircraft one uses the smallest physically reasonable strut, because an airfoil shaped strut produces an excess of drag compared to lift. Are the struts large because they are so worried about flutter on the wing, and so want to a...

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by kitplane01
Mon Jan 14, 2019 2:05 am
Forum: Civil Aviation
Topic: Boeing unveils new version of radical wing design
Replies: 141
Views: 25791

Re: Boeing unveils new version of radical wing design

What surprises me most about the braced NASA / Boeing design is the fact that they deem it worthwhile to attach struts to the thing. Sure, these allow them to make the main wing thinner and lighter. But the attachment point of the struts to the main wing also creates a really nasty interference poi...

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by kitplane01
Sun Jan 13, 2019 6:07 am
Forum: Civil Aviation
Topic: Boeing unveils new version of radical wing design
Replies: 141
Views: 25791

Re: Boeing unveils new version of radical wing design

New subsystems on a 737 would bring a 3% improvement. That conventional replacement doesn't have a CFRP wing. I consider folding wingtips a given to enable more underside laminar flow for another 3% improvement beyond the aspect ratio improvement. Lightsaber Boy, there is a lot to unpack there. Can...

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by kitplane01
Sun Jan 13, 2019 6:06 am
Forum: Civil Aviation
Topic: Boeing unveils new version of radical wing design
Replies: 141
Views: 25791

Re: Boeing unveils new version of radical wing design

Technical questions ... 1) The struts look airfoil shaped. On smaller aircraft one uses the smallest physically reasonable strut, because an airfoil shaped strut produces an excess of drag compared to lift. Are the struts large because they are so worried about flutter on the wing, and so want to at...

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by kitplane01
Sun Jan 13, 2019 5:43 am
Forum: Civil Aviation
Topic: LEVEL to order B787 or A330-800
Replies: 103
Views: 16967

Re: LEVEL to order B787 or A330-800

I wouldn’t rule out the 787. It has been the go to aircraft for Low-Cost Long-Haul airlines. Eh? Isn't it just Scoot, Norwegian and Jetstar? Combined about 60-ish 787s? Scoot and Jetstar both inherited the planes from their mother companies. Norwegian and Jetstar ordered and received the planes bef...

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by kitplane01
Sun Jan 13, 2019 5:40 am
Forum: Civil Aviation
Topic: LEVEL to order B787 or A330-800
Replies: 103
Views: 16967

Re: LEVEL to order B787 or A330-800

The choice is actually between the B789 and A338. The A338 I feel here can win as they would be sold at a very heavy discount price which Boeing won’t be able to match. Hence the lower capital purchase costs will end up being the big decider as I expect these planes to be with Level for the next 15...

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by kitplane01
Sat Jan 12, 2019 3:02 am
Forum: Civil Aviation
Topic: An unfair comparison II - DC-7 vs. CV-880 vs. A220-100
Replies: 24
Views: 3756

Re: An unfair comparison II - DC-7 vs. CV-880 vs. A220-100

It's strange to me that the structural efficiency (OEW/MTOW) is so much worse for the A220 than the others. DC-7: 51% CV-880: 46% A220: 58%. Carbon fibre is weaker than 1950's aluminum? Design tools were better in 1950?? Hello kitplane, I am very confident that both materials and construction tools...

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by kitplane01
Fri Jan 11, 2019 7:28 am
Forum: Civil Aviation
Topic: Boeing unveils new version of radical wing design
Replies: 141
Views: 25791

Re: Boeing unveils new version of radical wing design

All that wing looks like a lot of drag/fuel burn to me. It's very high aspect ratio, and quite thin for its span. I guess, but they still need the wing to hold things like flaps and ailerons, don't they? Fuel tanks? Seems like a lot of frontal surface area to push through the air. Perhaps it needs ...

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by kitplane01
Fri Jan 11, 2019 7:26 am
Forum: Civil Aviation
Topic: An unfair comparison II - DC-7 vs. CV-880 vs. A220-100
Replies: 24
Views: 3756

Re: An unfair comparison II - DC-7 vs. CV-880 vs. A220-100

Aircraft: Douglas DC-7C / Convair CV-880 22M / Airbus A220-100 OEW: 33.0t / 42.7t / 35.2t MTOW: 64.9t / 92.5t / 60.8t It's strange to me that the structural efficiency (OEW/MTOW) is so much worse for the A220 than the others. DC-7: 51% CV-880: 46% A220: 58%. Carbon fibre is weaker than 1950's alumi...

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by kitplane01
Thu Jan 10, 2019 4:17 am
Forum: Civil Aviation
Topic: An unfair comparison II - DC-7 vs. CV-880 vs. A220-100
Replies: 24
Views: 3756

Re: An unfair comparison II - DC-7 vs. CV-880 vs. A220-100

Aircraft: Douglas DC-7C / Convair CV-880 22M / Airbus A220-100 OEW: 33.0t / 42.7t / 35.2t MTOW: 64.9t / 92.5t / 60.8t It's strange to me that the structural efficiency (OEW/MTOW) is so much worse for the A220 than the others. DC-7: 51% CV-880: 46% A220: 58%. Carbon fibre is weaker than 1950's alumi...

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by kitplane01
Thu Jan 10, 2019 4:09 am
Forum: Civil Aviation
Topic: How are LCC's doing?
Replies: 12
Views: 1205

How are LCC's doing?

Is it the case that LCCs are doing poorly in the market because customers don't repeat with them? Just had a chance to fly Vueling. They were the lowest cost option. They did everything right, but were just too cramped. So I won't be flying them again. I'm not complaining, I just want to know if the...

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by kitplane01
Thu Jan 10, 2019 3:53 am
Forum: Civil Aviation
Topic: Boeing unveils new version of radical wing design
Replies: 141
Views: 25791

Re: Boeing unveils new version of radical wing design

Well Boeing has always said that the problem for a new conventional NSA is that it would only be 3-5% more efficient than the present re-engined models IE not nearly enough to warrant the considerable investment.Indeed one might say pointless. So yes something like this might well be the way forwar...

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by kitplane01
Tue Jan 08, 2019 8:20 pm
Forum: Technical/Operations
Topic: NAV database updates for airliners.
Replies: 42
Views: 2020

Re: NAV database updates for airliners.

On a Boeing, there is an issue date and an expiration date for the nav data base. If your data base is expired, you have to download and install the latest version. Not really rocket science because in general, all Boeing aircraft use the same nav data base. The most likely download source is a mem...

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by kitplane01
Tue Jan 08, 2019 6:05 am
Forum: Technical/Operations
Topic: Most expensive aircraft part
Replies: 33
Views: 5296

Most expensive aircraft part

What’s the most expensive part of an aircraft or its engines? And how much does that cost? My best guess would either be a blisk on a large turbine engine, or the biggest forging on the main landing gear on the a380. Rules: Has to be an indivisible part. So “landing gear” or “wing spar” don’t count ...

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by kitplane01
Tue Jan 08, 2019 5:53 am
Forum: Technical/Operations
Topic: NAV database updates for airliners.
Replies: 42
Views: 2020

Re: NAV database updates for airliners.

On a Boeing, there is an issue date and an expiration date for the nav data base. If your data base is expired, you have to download and install the latest version. Not really rocket science because in general, all Boeing aircraft use the same nav data base. The most likely download source is a mem...

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by kitplane01
Tue Jan 08, 2019 4:18 am
Forum: Technical/Operations
Topic: NAV database updates for airliners.
Replies: 42
Views: 2020

NAV database updates for airliners.

For general aviation aircraft, one updates the nav database by downloading a custom file tied to your specific serial number, putting it on a USB stick, and inserting that in the cockpit. Cost might be about $100, and 30 minutes work. How does this work for Boeing/Airbus? Is the update tied to a spe...

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by kitplane01
Thu Jan 03, 2019 4:51 am
Forum: Civil Aviation
Topic: Restrictions on Iranian Airlines
Replies: 26
Views: 4115

Re: Restrictions on Iranian Airlines

Still confused. Iran has planes that need American engine parts. How do they get these parts? Even ATRs need engines built bu a company owned American. Used parts from scrappers, buying thru cut-outs, make your own small parts. GF For older airplanes, they would make their own parts or rob from ret...

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by kitplane01
Thu Jan 03, 2019 4:47 am
Forum: Civil Aviation
Topic: Restrictions on Iranian Airlines
Replies: 26
Views: 4115

Re: Restrictions on Iranian Airlines

As long as there are snake oil salesmen in the west ready to make a quick buck by selling scrap yard parts to Iran will have no issue. And greed has no boundaries. The best option would be to allow a couple of UN/West approved MROs to sell/replace/track genuine parts so Iran cannot copy for dual us...

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by kitplane01
Wed Jan 02, 2019 4:51 am
Forum: Civil Aviation
Topic: Restrictions on Iranian Airlines
Replies: 26
Views: 4115

Re: Restrictions on Iranian Airlines

Still confused. Iran has planes that need American engine parts. How do they get these parts? Even ATRs need engines built bu a company owned American. Used parts from scrappers, buying thru cut-outs, make your own small parts. GF How does an Iranian airline get updates to t g e nav databases? Even...

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by kitplane01
Tue Jan 01, 2019 8:01 pm
Forum: Civil Aviation
Topic: Restrictions on Iranian Airlines
Replies: 26
Views: 4115

Re: Restrictions on Iranian Airlines

Still confused. Iran has planes that need American engine parts. How do they get these parts? Even ATRs need engines built bu a company owned American.

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by kitplane01
Tue Jan 01, 2019 4:19 am
Forum: Civil Aviation
Topic: Restrictions on Iranian Airlines
Replies: 26
Views: 4115

Re: Restrictions on Iranian Airlines

What is the rule? Can P&W or GE not ship engine parts to Iran? And can Iran not buy them second hand from Hong Kong (or some other place)? And what about RR??

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by kitplane01
Tue Jan 01, 2019 12:10 am
Forum: Civil Aviation
Topic: Restrictions on Iranian Airlines
Replies: 26
Views: 4115

Restrictions on Iranian Airlines

What are the practical restrictions on Iranian airline companies? 1) Can they buy new western aircraft (Boeing and Airbus) 2) Can they buy (and get support/parts for) used Boeing/Airbus aircraft? 3) Can they buy Russian airliners, or do those have too many western parts? 4) Can they fly to western n...

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by kitplane01
Tue Dec 25, 2018 11:56 pm
Forum: Technical/Operations
Topic: Derating engines and SFC
Replies: 31
Views: 2081

Re: Derating engines and SFC

Clearing up confusion: We all agree that the same hardware producing the same thrust under the same conditions has the same SFC, regardless of any paper derate. My question is, if one copy of the engine is producing max cruise thrust, and the other is producing 80% of cruise thrust because it's on ...

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by kitplane01
Tue Dec 25, 2018 6:30 am
Forum: Technical/Operations
Topic: Derating engines and SFC
Replies: 31
Views: 2081

Re: Derating engines and SFC

Clearing up confusion: We all agree that the same hardware producing the same thrust under the same conditions has the same SFC, regardless of any paper derate. My question is, if one copy of the engine is producing max cruise thrust, and the other is producing 80% of cruise thrust because it's on a...

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by kitplane01
Tue Dec 25, 2018 6:28 am
Forum: Technical/Operations
Topic: Derating engines and SFC
Replies: 31
Views: 2081

Re: Derating engines and SFC

Just found some info - it is apparently in a university lecture, but actual PW data seems to be used: https://nptel.ac.in/courses/101106041/chapter%204%20Lecture%2016%2020-12-2011.pdf Your question is answered in fig 4.13 a-d on pages 5-7. Looks like SFC goes up with the decrease of thrust at the s...

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by kitplane01
Tue Dec 25, 2018 6:26 am
Forum: Technical/Operations
Topic: Derating engines and SFC
Replies: 31
Views: 2081

Re: Derating engines and SFC

Put the same plane at the same conditions, in cruise, it requires the same thrust no matter what take-off rating was used. GF That's so true, and not what I was trying to ask. Suppose you have rated for cruise thrust X, and instead you fly it on a smaller plane that only need cruise thrust 80% of X...

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by kitplane01
Tue Dec 25, 2018 6:23 am
Forum: Technical/Operations
Topic: Derating engines and SFC
Replies: 31
Views: 2081

Re: Derating engines and SFC

Just found some info - it is apparently in a university lecture, but actual PW data seems to be used: https://nptel.ac.in/courses/101106041/chapter%204%20Lecture%2016%2020-12-2011.pdf Your question is answered in fig 4.13 a-d on pages 5-7. Looks like SFC goes up with the decrease of thrust at the s...

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by kitplane01
Sun Dec 23, 2018 10:59 pm
Forum: Technical/Operations
Topic: Derating engines and SFC
Replies: 31
Views: 2081

Re: Derating engines and SFC

As the derate doesn't involve hardware changes, SFC isn't changed at all. A 35k pound engine on a very light A321 will burn the same amount of fuel as a 25k pound engine on heavy A319 at the same gross weight. And yes, hardware tweaks would help. No chance that does pay off though.... Are you sure ...

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by kitplane01
Sun Dec 23, 2018 6:34 am
Forum: Technical/Operations
Topic: Derating engines and SFC
Replies: 31
Views: 2081

Derating engines and SFC

Suppose one derates and engine 20%-30% via software. How does this effect specific fuel consumption? I could imagine an argument that it works fine. The fan probably is reasonably efficient at many RPMs. I can imagine an argument it work poorly. Running the combustors at low temperatures is efficien...

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by kitplane01
Fri Dec 14, 2018 5:50 am
Forum: Civil Aviation
Topic: Brazil: Foreign Ownership Limit of Airlines Eliminated
Replies: 42
Views: 4803

Re: Brazil: Foreign Ownership Limit of Airlines Eliminated

AtomicGarden wrote:
DGVT wrote:
Very good, time for the communist USA and EU to do the same.


Hope Argentina doesn't follow suit. Don't know if the limitation is good or bad, ...


What!!!! You don't know if it's good or bad, but you then express a preference. That totally makes sense.

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by kitplane01
Fri Dec 14, 2018 5:45 am
Forum: Technical/Operations
Topic: How much have Jet Engines Improved?
Replies: 17
Views: 2597

Re: How much have Jet Engines Improved?

The difference in Technology between the JT-9D and the PW-4000 0rvthe CF-6 and the GE-90? Are akin to the Model T and a Corvette. The power to weight vs Fuel consumption? Unimagineable in comparison. We Know so much more today about building engines and better still? Maintaining them. We once had a...

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by kitplane01
Thu Dec 13, 2018 9:50 pm
Forum: Civil Aviation
Topic: Boeing Releases 777X BBJ; 11,000+ nm Range
Replies: 68
Views: 13725

Re: Boeing Releases 777X BBJ; 11,000+ nm Range

I disagree. The plane will be certified to a particular pressurization level, and you're not allowed to exceed that. It will be the level that Boeing tested and designed for. Unless Boeing wants to spend $$$$, it will be the same level as every other 777X, Probably, the electronic controller would ...

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by kitplane01
Thu Dec 13, 2018 9:47 pm
Forum: Technical/Operations
Topic: How much have Jet Engines Improved?
Replies: 17
Views: 2597

Re: How much have Jet Engines Improved?

https://en.wikipedia.org/wiki/Thrust-sp ... st_engines


Jeepers. I'm an editor of Wiki aviation stuff and I've never seen this. Double much thanks.
-->

OldAeroGuy wrote:


Jeepers. I'm an editor of Wiki aviation stuff and I've never seen this. Double much thanks.

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by kitplane01
Thu Dec 13, 2018 7:08 am
Forum: Civil Aviation
Topic: BBD ready to deliver Global 7500 to 1st Customer
Replies: 13
Views: 3222

Re: BBD ready to deliver Global 7500 to 1st Customer

It’s late, true; but it’s a fantastic plane technically. Much like the C-Series, despite the financial turmoil, the politics, the noise, the designers and builders delivered and then some. I’ve seen a DXB-LAX flight plan, transpolar. Not in the brochure, in the FMS. GF Anyone want to compare it aga...

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by kitplane01
Thu Dec 13, 2018 7:04 am
Forum: Civil Aviation
Topic: Boeing Releases 777X BBJ; 11,000+ nm Range
Replies: 68
Views: 13725

Re: Boeing Releases 777X BBJ; 11,000+ nm Range

Nothing stops the 777X from having lower cabin alt/ higher humidity. Composite frame have lower standard cabin alt because composites are better able to withstand the fatigue over time from the greater stresses of the pressure differential from the higher cabin pressure. A business 777X will not be...

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by kitplane01
Tue Dec 11, 2018 9:38 pm
Forum: Civil Aviation
Topic: Has BA been too slow with fleet renewals
Replies: 78
Views: 11099

Re: Has BA been too slow with fleet renewals

If you look at the chart below, they seem to lag behind most other airlines. Perhaps little and often orders would have been better. They also seem to be well down the future production lists for the 787-10 and the A350-1000 too. Aircraft Number Age Rank for the age by aircraft type Airbus A318 1 9...

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by kitplane01
Tue Dec 11, 2018 9:29 pm
Forum: Technical/Operations
Topic: How much have Jet Engines Improved?
Replies: 17
Views: 2597

Re: How much have Jet Engines Improved?

There's been tremendous improvement. Let's compare mature designs, rather than new ones that are still having teething issues (like the CFMLEAP and PWGEARGRINDER). The JT-8D was often times a 4000-5000 hour overhaul engine. Brand new, they'd last a bit longer. But the CFM56-7B is easily a 30,000 ho...

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by kitplane01
Tue Dec 11, 2018 9:28 pm
Forum: Civil Aviation
Topic: Boeing Releases 777X BBJ; 11,000+ nm Range
Replies: 68
Views: 13725

Re: Boeing Releases 777X BBJ; 11,000+ nm Range

Boeing today announced the expected BBJ variants of the 777X. https://boeing.mediaroom.com/2018-12-10-Boeing-Launches-Longest-Range-Business-Jet-Ever-with-BBJ-777X There are eye-popping range claims for both: 11645 nm for the 777-8 BBJ and 11000 nm for the 777-9 BBJ. As a reminder, half the distanc...

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by kitplane01
Tue Dec 11, 2018 4:14 am
Forum: Technical/Operations
Topic: How much have Jet Engines Improved?
Replies: 17
Views: 2597

How much have Jet Engines Improved?

Suppose I were to compare something like a JT-8D from the 727 with a PW1500G from the A220, or a JT-9D from a 747-100 with a GEnx-2B from a 747-8. How does the on-wing time, and the fuel consumption, compare?

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by kitplane01
Tue Dec 11, 2018 4:10 am
Forum: Civil Aviation
Topic: Southwest Airlines 150 Seat 737-700 Replacement Question, Status?
Replies: 143
Views: 14970

Re: Southwest Airlines 150 Seat 737-700 Replacement Question, Status?

SWA needs to think outside the box. 787’s and then they need a regional to fly to the Midwest city’s in a E175. Thats how i would run it. Look up flight aware. Filter by operator. SWA. It’s astonishing how they can see that everyday, and not see the gap they are missing... If Southwest adds a diffe...

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by kitplane01
Tue Dec 11, 2018 1:06 am
Forum: Civil Aviation
Topic: Boeing Releases 777X BBJ; 11,000+ nm Range
Replies: 68
Views: 13725

Re: Boeing Releases 777X BBJ; 11,000+ nm Range

Boeing today announced the expected BBJ variants of the 777X. https://boeing.mediaroom.com/2018-12-10-Boeing-Launches-Longest-Range-Business-Jet-Ever-with-BBJ-777X There are eye-popping range claims for both: 11645 nm for the 777-8 BBJ and 11000 nm for the 777-9 BBJ. As a reminder, half the distanc...

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by kitplane01
Tue Dec 11, 2018 1:04 am
Forum: Civil Aviation
Topic: Boeing Releases 777X BBJ; 11,000+ nm Range
Replies: 68
Views: 13725

Re: Boeing Releases 777X BBJ; 11,000+ nm Range

Boeing today announced the expected BBJ variants of the 777X. https://boeing.mediaroom.com/2018-12-10-Boeing-Launches-Longest-Range-Business-Jet-Ever-with-BBJ-777X There are eye-popping range claims for both: 11645 nm for the 777-8 BBJ and 11000 nm for the 777-9 BBJ. As a reminder, half the distanc...

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by kitplane01
Mon Dec 10, 2018 12:40 am
Forum: Civil Aviation
Topic: Southwest Airlines 150 Seat 737-700 Replacement Question, Status?
Replies: 143
Views: 14970

Re: Southwest Airlines 150 Seat 737-700 Replacement Question, Status?

Southwest is in for a rude awakening once they have to compete head to head with the CS100/300s of their competitors. Neither 73G nor 7M7 will win against them. Southwest's yield on these routes will take a beating. Keep eye on routes involving LAX, ATL, MCO & FLL this is where I believe it wil...

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by kitplane01
Sun Dec 09, 2018 8:03 am
Forum: Civil Aviation
Topic: Is Airbus hiding a new A322 business case behind the 100t+ A321XLR study? Numbers..
Replies: 211
Views: 24230

Re: Is Airbus hiding a new A322 business case behind the 100t+ A321XLR study? Numbers..

Also holiday routes often have peak demand on weekends and they are seasonal. Operating an A321XLR instead of an 767 has many advantage in terms of scaling the route with demand. The smaller aircraft allows for smaller increments of scaling as you can simply run two daily flights on peak days/seaso...

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by kitplane01
Fri Dec 07, 2018 3:48 pm
Forum: Civil Aviation
Topic: Is Airbus hiding a new A322 business case behind the 100t+ A321XLR study? Numbers..
Replies: 211
Views: 24230

Re: Is Airbus hiding a new A322 business case behind the 100t+ A321XLR study? Numbers..

For a typical low cost airline: Roughly 30-40$ block hour costs for the FA - say 35$ for the example Say 2 hour stage length. 60-80$ extra cost. - 70$ for the example average load factor 90-95% - say 92% for the example Operating margin 7%. average ticket price 80-100$ - say 90$ for the example ave...

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by kitplane01
Thu Dec 06, 2018 3:12 am
Forum: Civil Aviation
Topic: Is Airbus hiding a new A322 business case behind the 100t+ A321XLR study? Numbers..
Replies: 211
Views: 24230

Re: Is Airbus hiding a new A322 business case behind the 100t+ A321XLR study? Numbers..

The topic is an A321 stretch. Yes, Airbus can afford to stretch a A321. Question: Should they? Answer: I sure would. A very load cost, no MTWO increase, pure stretch. And I would do it (and lock up as many orders as a could) before Boeing announces a MoM aircraft. Fair enough, but to me at least yo...

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by kitplane01
Thu Dec 06, 2018 2:08 am
Forum: Civil Aviation
Topic: Is Airbus hiding a new A322 business case behind the 100t+ A321XLR study? Numbers..
Replies: 211
Views: 24230

Re: Is Airbus hiding a new A322 business case behind the 100t+ A321XLR study? Numbers..

IMHO, Airbus will not open their cards on A322 until Boeing firms up 797. Otherwise they may undercut themselves. If Boeing goes stupid and launches a "MoM", they'll make an A322 and kill it with price. If Boeing starts a clean sheet 737 replacement, they'll invest in a clean sheet A320 f...

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