Search found 1336 matches

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by JayinKitsap
Mon Jul 22, 2019 11:43 pm
Forum: Technical/Operations
Topic: Minimum Runway Length Requirement
Replies: 9
Views: 512

Re: Minimum Runway Length Requirement

Okay... let me change it. What’s the runway length needed for A321 XLR - MAXIMUM LOAD / 196 PAX. Simply intrigued to see if airlines can fly the A321 XLR our of smaller airports. Each airplane has an airport planning guide. For the A321 look at pages 145 to 160 of its guide. https://www.airbus.com/...

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by JayinKitsap
Mon Jul 22, 2019 3:31 pm
Forum: Civil Aviation
Topic: Boeing 797 Thread - 2019
Replies: 1116
Views: 152431

Re: Boeing 797 Thread - 2019

A factor with CFRP barrel manufacturing, the mandrel that goes into the layup machine is a simple unit. Fiberglass manufacturers change almost daily the mandrel size for a 10' diameter tank one day, and a 12' diameter the next. Changing the cross section is now not much different than changing the l...

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by JayinKitsap
Sun Jul 21, 2019 6:11 pm
Forum: Military Aviation & Space Flight
Topic: Updated: U.S. has formally kicked Turkey out of the F-35 JSF program
Replies: 124
Views: 12435

Re: Updated: U.S. has formally kicked Turkey out of the F-35 JSF program

Totally crazy boys, totally crazy. Even at the ripe old age of 50 I make an effort to understand today's teenagers. What I mean is that Erdogan is steering Turkey awfully close to the path of Iran. The mullahs may be more behind the scenes but they wield a lot of influence, and once you uncork that...

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by JayinKitsap
Sat Jul 20, 2019 7:15 pm
Forum: Civil Aviation
Topic: Bombardier launch new 50 seater CRJ550 based on CRJ700
Replies: 113
Views: 26381

Re: Bombardier launch new 50 seater CRJ550 based on CRJ700

Skywest operates 50, 70, and 76 seat planes to comply with the various scope clauses. Yes the SC stands for Scope Clause.

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by JayinKitsap
Sat Jul 20, 2019 7:08 pm
Forum: Civil Aviation
Topic: Boeing 797 Thread - 2019
Replies: 1116
Views: 152431

Re: Boeing 797 Thread - 2019

Thank you for the great post Boeing knows exactly what the first variation of the NMA aircraft will be; and is 90% + confident on the 2nd variation (it may change slightly depending on the response to the 1st marketed variation). If it was not for the 737Max8 issue reports from several sources indi...

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by JayinKitsap
Wed Jul 17, 2019 8:20 pm
Forum: Military Aviation & Space Flight
Topic: Updated: U.S. has formally kicked Turkey out of the F-35 JSF program
Replies: 124
Views: 12435

Re: The U.S. has threatened to expel Turkey from the F-35

Turkey formally kicked out: https://twitter.com/MarcusReports/status/1151556924175015942 Millions of dollars of contributions from Turkey wasted since 2002 because lunatic Erdoğan wants to score some anti-American points. It appears done, possibly DOD can be nice and let Turkey continue parts produ...

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by JayinKitsap
Wed Jul 17, 2019 3:24 pm
Forum: Civil Aviation
Topic: Boeing 797 Thread - 2019
Replies: 1116
Views: 152431

Re: Boeing 797 Thread - 2019

Thank you for the great post At this moment, actually Boeing is still unsure if their NMA will be a 757 or 767 based. As for me I believed that NMA should be based on the 757... If Boeing decides that their NMA will be based on the 757, it will be the base for their new 737 or NSA too.... Boeing kno...

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by JayinKitsap
Tue Jul 16, 2019 10:10 pm
Forum: Civil Aviation
Topic: Boeing 797 Thread - 2019
Replies: 1116
Views: 152431

Re: Boeing 797 Thread - 2019

Countless times in discussing the A380 was that we need larger planes to ease congested airports, so all routes should be A380's (well a lot of A380s). But what needs to happen is the AVERAGE size of plane needs to increase. Also, congestion is eased by increasing the proportion of flights being non...

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by JayinKitsap
Tue Jul 16, 2019 3:35 pm
Forum: Civil Aviation
Topic: Something wrong with Boeing's safety culture?
Replies: 293
Views: 35258

Re: Something wrong with Boeing's safety culture?

NTSB recently placed all the blame for a train wreck killing three in Washington State Amtrak/Cascades. The engineer seemed to escape almost all blame. He missed a speed reduction sign and left the track at 80 mph on a 30 mph curve. Now the fact that at about 10 minutes out of Tacoma the train need...

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by JayinKitsap
Tue Jul 16, 2019 3:16 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q3 2019
Replies: 887
Views: 129891

Re: Boeing 737MAX Grounded Worldwide Q3 2019

There have been 387 Max deliveries compared to 7,038 NG deliveries or 5%. Add in A320 deliveries the MAX debacle means roughly 2% of the current build planes, and roughly 5% of currently in service planes are grounded. At these levels the loss of capacity hurts but doesn't kill the major airlines, ...

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by JayinKitsap
Tue Jul 16, 2019 3:12 pm
Forum: Civil Aviation
Topic: Boeing 797 Thread - 2019
Replies: 1116
Views: 152431

Re: Boeing 797 Thread - 2019

Take a 35 row single class plane, at 6ab that is 210 pax, at 7ab it is 245 pax, at 8ab it is 280 pax. Yes the 7ab is less efficient from a frontal area perspective. But it keeps the length in a normal proportion. Drag is a function of many things, so the frontal area penalty is large but not a game ...

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by JayinKitsap
Tue Jul 16, 2019 2:42 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q3 2019
Replies: 887
Views: 129891

Re: Boeing 737MAX Grounded Worldwide Q3 2019

Even in the best case scenario the winter holiday season will be influenced, at least for certain airlines. If Boeing submits the fix in beginning of September and the agencies need 2 months for review and testing the aircraft would be cleared in the beginning of November. As every aircraft needs a...

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by JayinKitsap
Tue Jul 16, 2019 2:23 pm
Forum: Military Aviation & Space Flight
Topic: USAF Considering New Build F-15X
Replies: 737
Views: 69604

Re: USAF Considering New Build F-15X

You'll have to come up with a link to a news story or something. I know you don't trust The Drive, but this is something that do not get bantered out haphazardly. https://www.thedrive.com/the-war-zone/26305/f-15x-will-come-in-two-variants-and-no-it-wont-cost-100m-per-copy In addition, the F-15X was...

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by JayinKitsap
Mon Jul 15, 2019 2:26 am
Forum: Civil Aviation
Topic: Boeing 797 Thread - 2019
Replies: 1116
Views: 152431

Re: Boeing 797 Thread - 2019

For production efficiency I see both the NMA and NSA being CFRP barrels. It is highly automated, earlier in the learning curve (CFRP costs are rising slower than Aluminum), almost no fasteners except at the joints, and has much easier C and D checks. Heck, Leonardo is building two CFRP bodies for th...

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by JayinKitsap
Sun Jul 14, 2019 9:32 pm
Forum: Military Aviation & Space Flight
Topic: A400M Update Thread 2019
Replies: 188
Views: 25286

Re: A400M Update Thread 2019

Maybe the PW had been a disaster. PW never built a prop engine of that size. We'll never know. The PW4000, PW8000 were problematic at the time. We're all free to have our own opinions, but I think it's pretty likely that PW would have avoided the major EPI rookie mistakes, namely the lack of unders...

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by JayinKitsap
Sun Jul 14, 2019 9:24 pm
Forum: Military Aviation & Space Flight
Topic: Updated: U.S. has formally kicked Turkey out of the F-35 JSF program
Replies: 124
Views: 12435

Re: The U.S. has threatened to expel Turkey from the F-35

An article from the DOD. It notes that all F-35 partners and all countries in NATO are aligned that when the S-400 system arrives in Turkey, they will be dropped from the F-35 program. https://www.defense.gov/explore/story/Article/1901219/turkey-must-drop-russian-s-400-to-stay-in-f-35-program-dod-o...

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by JayinKitsap
Sun Jul 14, 2019 9:03 pm
Forum: Technical/Operations
Topic: GE9X Record Breaker
Replies: 59
Views: 7779

Re: GE9X Record Breaker

I believe there are hot and high considerations, flying out of Denver at 105F or Dubai at 120F the light air requires more thrust from the engine at the same time the engine produces less thrust because of the light air. Changing the condition to a -20F at sealevel the air is far denser. The larger ...

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by JayinKitsap
Sun Jul 14, 2019 8:48 pm
Forum: Technical/Operations
Topic: 737MAX: What are the Regulatory Limits of MCAS?
Replies: 2
Views: 717

Re: 737MAX: What are the Regulatory Limits of MCAS?

It is my understanding that MCAS was needed to replicate the handing of the 737NG, the added upwards moment at high AOA of the new engine position changed the characteristics. It would have been fine to not have except it would behave different than a NG.

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by JayinKitsap
Sun Jul 14, 2019 8:44 pm
Forum: Technical/Operations
Topic: RAT Deployment and ETOPS
Replies: 28
Views: 2377

Re: RAT Deployment and ETOPS

Isn't the RAT the last choice when both engines are out as well as the APU. A chance to land the glider?

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by JayinKitsap
Sun Jul 14, 2019 8:31 pm
Forum: Civil Aviation
Topic: Something wrong with Boeing's safety culture?
Replies: 293
Views: 35258

Re: Something wrong with Boeing's safety culture?

I may have missed some reports but it seems hard to understand how a faulty AOA sensor and the MCAS was not found in certification or in service a whole number of times. Many AOA sensors have been replaced, what didn't cause the trim issues a bunch of times and reports of the sensor issues. I read s...

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by JayinKitsap
Sat Jul 13, 2019 3:23 pm
Forum: Military Aviation & Space Flight
Topic: A400M Update Thread 2019
Replies: 188
Views: 25286

Re: A400M Update Thread 2019

I couldn't resist. I thought Airbus software was perfect. In 2015 one A400M aircraft crashed in Spain during a test flight, killing four crew members. A software fault, since rectified, was found to be the cause of the crash. Imagine the A400M if it had used the Pratt Canada engines, could have sav...

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by JayinKitsap
Sat Jul 13, 2019 1:59 am
Forum: Military Aviation & Space Flight
Topic: Boeing Beats Lockheed for $9.2 Billion Air Force Trainer Program
Replies: 117
Views: 21951

Re: Boeing Beats Lockheed for $9.2 Billion Air Force Trainer Program

Interesting article in Air Force Magazine: http://www.airforcemag.com/MagazineArchive/Pages/2019/July%202019/How-Boeing-Won-the-T-X.aspx Some highlights: - 3D design software let them use a 'virtual wind tunnel' to reduce time in the real wind tunnel - Boeing had full trust in the model to “represe...

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by JayinKitsap
Fri Jul 12, 2019 7:14 pm
Forum: Military Aviation & Space Flight
Topic: A400M Update Thread 2019
Replies: 188
Views: 25286

Re: A400M Update Thread 2019

I couldn't resist. I thought Airbus software was perfect. In 2015 one A400M aircraft crashed in Spain during a test flight, killing four crew members. A software fault, since rectified, was found to be the cause of the crash. Imagine the A400M if it had used the Pratt Canada engines, could have save...

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by JayinKitsap
Fri Jul 12, 2019 7:03 pm
Forum: Civil Aviation
Topic: IAG 737 Max Order Is Prompted by More Than Just Price: CEO
Replies: 133
Views: 19421

Re: IAG 737 Max Order Is Prompted by More Than Just Price: CEO

I think the real reason is IAG was able to grab some of Jet's delivery positions. Possibly all 200 will be delivered before Airbus completes their current IAG orders.

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by JayinKitsap
Fri Jul 12, 2019 3:37 am
Forum: Military Aviation & Space Flight
Topic: Updated: U.S. has formally kicked Turkey out of the F-35 JSF program
Replies: 124
Views: 12435

Re: The U.S. has threatened to expel Turkey from the F-35

Well, there is certainly no F-35 information, training, parts, and certainly no planes going to Turkey anytime soon. It might just be on the down low for a while, possibly to let the F-35 suppliers in Turkey to deliver a lot of parts while 2nd sources are geared up. But by the time DOD FY20 budgets ...

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by JayinKitsap
Fri Jul 12, 2019 3:28 am
Forum: Technical/Operations
Topic: Mandate fly-by-wire for transport class aircraft through Part 25 regulation?
Replies: 9
Views: 1894

Re: Mandate fly-by-wire for transport class aircraft through Part 25 regulation?

Telling engineers a specific way to design is dangerous and also kills innovation. Its another field but a perfect example of the problems with this approach. In steel building design the US building codes for 2 decades required moment frames to be designed in strict accordance to a prescriptive ske...

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by JayinKitsap
Fri Jul 12, 2019 12:05 am
Forum: Civil Aviation
Topic: Jeffrey Epstein’s aircraft
Replies: 26
Views: 6424

Re: Jeffrey Epstein’s aircraft

https://www.zerohedge.com/news/2019-07- ... t-document
-->

This article notes that Epstein's lawyers informed the court that he only has one jet now. One was sold in June 2019, no mention of the 3rd.

https://www.zerohedge.com/news/2019-07- ... t-document

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by JayinKitsap
Wed Jul 10, 2019 10:29 pm
Forum: Military Aviation & Space Flight
Topic: Updated: U.S. has formally kicked Turkey out of the F-35 JSF program
Replies: 124
Views: 12435

Re: The U.S. has threatened to expel Turkey from the F-35

An article from the DOD. It notes that all F-35 partners and all countries in NATO are aligned that when the S-400 system arrives in Turkey, they will be dropped from the F-35 program. https://www.defense.gov/explore/story/Article/1901219/turkey-must-drop-russian-s-400-to-stay-in-f-35-program-dod-of...

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by JayinKitsap
Wed Jul 10, 2019 2:16 pm
Forum: Military Aviation & Space Flight
Topic: Updated: U.S. has formally kicked Turkey out of the F-35 JSF program
Replies: 124
Views: 12435

Re: The U.S. has threatened to expel Turkey from the F-35

I am amazed that Turkey seems to be trying hard to get kicked off the F-35 program. It isn't perfect but it is coming into its own as the fighter of choice. Sure the Su-57 is a hot plane but only a dozen or so are flying and production is around 10 per year, availability of spare parts will be dread...

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by JayinKitsap
Wed Jul 10, 2019 3:30 am
Forum: Military Aviation & Space Flight
Topic: Updated: U.S. has formally kicked Turkey out of the F-35 JSF program
Replies: 124
Views: 12435

Re: The U.S. has threatened to expel Turkey from the F-35

https://www.thedrive.com/the-war-zone/28832/turkey-reportedly-hoarding-spare-f-16-parts-as-it-faces-sanctions-over-s-400-purchases So Turkey has contingency plans in place in case relations with the US worsen. I still believe that a compromise will be found. Turkey is too critical of an ally to ali...

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by JayinKitsap
Mon Jul 08, 2019 1:14 pm
Forum: Civil Aviation
Topic: Emirates renegotiating 777X order
Replies: 587
Views: 98591

Re: Emirates renegotiating 777X order

Interesting to read half this thread arguing the -9 is too big and the other half arguing it should be bigger. Maybe that means it's the right size after all? Boeing increased the 779 size to where it reached the limits of the existing 777 design. It is almost filling the 80 M box for length, I thi...

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by JayinKitsap
Mon Jul 08, 2019 5:04 am
Forum: Military Aviation & Space Flight
Topic: Updated: U.S. has formally kicked Turkey out of the F-35 JSF program
Replies: 124
Views: 12435

Re: The U.S. has threatened to expel Turkey from the F-35

Why would we want the F-35 operating constantly in proximity to the S-400. Every F-35 flight from the airport recorded for review by the Russians on how to detect it - not good. Every interaction the F-35 needs to send out its 'Friend or Foe' designation, what point is that if the Russians know how ...

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by JayinKitsap
Sun Jul 07, 2019 5:23 am
Forum: Civil Aviation
Topic: Could the 787 be scaled to create the 797?
Replies: 52
Views: 9220

Re: Could the 787 be scaled to create the 797?

The value equation would relate to using the 787's technologies, manufacturing processes and supply chain rather than a scaled down 787. I suspect the cost to create a NMA sub system using 787 technology would be far less than original cost of development associated with the 787. I agree. The whole...

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by JayinKitsap
Thu Jul 04, 2019 4:10 pm
Forum: Travel, Polls & Preferences
Topic: The Future of Boeing
Replies: 35
Views: 2350

Re: The Future of Boeing

With the incessant bashing of Boeing on a.net it must be ready to crater and declare bankruptcy at any time now. I thought this was a forum on aviation not a sports betting site. Who is going to win the world cup type of stuff. If the airlines thought there was any risk of the ordered planes not bei...

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by JayinKitsap
Wed Jul 03, 2019 9:25 pm
Forum: Civil Aviation
Topic: Emirates renegotiating 777X order
Replies: 587
Views: 98591

Re: Emirates renegotiating 777X order

Great post! The A380 looked OK at first, but the 77W charged ahead, I assume because it was more profitable to fly. If EK keeps its planes 12 years, they will still have a couple dozen or more to handle LHR and similar restricted markets. IF parts do not get crazy hard/$$$ there may be 50 still flyi...

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by JayinKitsap
Wed Jul 03, 2019 4:42 pm
Forum: Military Aviation & Space Flight
Topic: F-35 news thread
Replies: 1133
Views: 122317

Re: F-35 news thread

This could be a reason the F-`15EX is being bought. If the F135 engine is seriously late for prior year production can they up their deliveries, probably not. Must be frustrating that P&W cannot deliver the engines on time. They have had enough notice of increasing production that this shouldn't...

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by JayinKitsap
Wed Jul 03, 2019 4:12 pm
Forum: Civil Aviation
Topic: Federal Prosecutors Expanding Boeing Investigation to CHS 787 Production Site
Replies: 154
Views: 18946

Re: Federal Prosecutors Expanding Boeing Investigation to CHS 787 Production Site

Let's not forget that Boeing Seattle workers don't come off looking like saints either, with the FOD discoveries grinding KC-46 deliveries to a halt. Glass houses, and all that stuff... It seems the P-8 workers did not talk to the KC-46 workers. In particular since the FOD discoveries I am surprise...

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by JayinKitsap
Tue Jul 02, 2019 5:00 am
Forum: Civil Aviation
Topic: Federal Prosecutors Expanding Boeing Investigation to CHS 787 Production Site
Replies: 154
Views: 18946

Re: Federal Prosecutors Expanding Boeing Investigation to CHS 787 Production Site

So many of the posters here act like this is the first time a company screwed up. Yes, errors were made by McN in particular, that Alan M probably would have not done. But Alan M went on to change Ford, keeping it out of a scandal that consumed many of the big auto companies. Intentional cheating a...

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by JayinKitsap
Tue Jul 02, 2019 4:40 am
Forum: Civil Aviation
Topic: Federal Prosecutors Expanding Boeing Investigation to CHS 787 Production Site
Replies: 154
Views: 18946

Re: Federal Prosecutors Expanding Boeing Investigation to CHS 787 Production Site

So many of the posters here act like this is the first time a company screwed up. Yes, errors were made by McN in particular, that Alan M probably would have not done. But Alan M went on to change Ford, keeping it out of a scandal that consumed many of the big auto companies. Intentional cheating at...

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by JayinKitsap
Wed Jun 26, 2019 6:24 am
Forum: Civil Aviation
Topic: Bloomberg:Airbus Says It Must Slash A350 Costs to Win Wide-Body Price War
Replies: 292
Views: 33919

Re: Bloomberg:Airbus Says It Must Slash A350 Costs to Win Wide-Body Price War

The wings are the reason nine Beluga flight are required for each A350, while only three are required for an A330. The wing top skin is manufactured in Spain, flown to the UK to make a wing structure. The wing structure is flown to Bremen, Germany where the flaps are mounted. The finished wing is f...

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by JayinKitsap
Wed Jun 26, 2019 5:10 am
Forum: Civil Aviation
Topic: Business Risk for Boeing: The A321XLR
Replies: 409
Views: 45528

Re: Business Risk for Boeing: The A321XLR

Folks, do you really believe Boeing has not had these same arguments within the company? Single aisle? 7 or 8 abreast? What would Airbus response and how fast? Please tell me you do believe Boeing has done its due diligence. Unlike those of us here, Boeing has to make money on this product and has ...

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by JayinKitsap
Tue Jun 25, 2019 5:46 pm
Forum: Civil Aviation
Topic: Bloomberg:Airbus Says It Must Slash A350 Costs to Win Wide-Body Price War
Replies: 292
Views: 33919

Re: Bloomberg:Airbus Says It Must Slash A350 Costs to Win Wide-Body Price War

From footage I've seen about the A350 fuselage panel construction, this looks like a really time-consuming labor and machining intensive proces. Thus really expansive. Here is an example: https://m.youtube.com/watch?v=6_R54EVDdf0 And another one that shows another eliminatable logistics step: Examp...

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by JayinKitsap
Mon Jun 24, 2019 8:42 pm
Forum: Civil Aviation
Topic: LH will look at A321XLR, but it's no game-changer: CEO
Replies: 183
Views: 24773

Re: LH will look at A321XLR, but it's no game-changer: CEO

I am sure that the A321 is going to dominate the NB market. Has to be.

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by JayinKitsap
Mon Jun 24, 2019 8:37 pm
Forum: Civil Aviation
Topic: Business Risk for Boeing: The A321XLR
Replies: 409
Views: 45528

Re: Business Risk for Boeing: The A321XLR

I predict if Boeing brings NMA in 2020 and start delivering 2026/27, Airbus will launch the A320 replacement in 2023 with delivery in 2030. Just that the new Airbus narrowbody will be 320/321/322 sized instead of 319/320/321. The lower end will be covered by 220-500. Thats why Boeing has such a har...

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by JayinKitsap
Mon Jun 24, 2019 7:14 am
Forum: Civil Aviation
Topic: Air France delays A380 cabin refit; future of fleet under study
Replies: 147
Views: 21983

Re: Air France delays A380 cabin refit; future of fleet under study

I'm comfortable in 10 abreast on the 777 and I have wider than average shoulders. So it is the default. The A380 should have been 11 across main deck and 9-across top. It's failure wasn't being too big, but not big enough. To those favoring the A380, look at how much space is lost to the two stairc...

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by JayinKitsap
Mon Jun 24, 2019 5:53 am
Forum: Civil Aviation
Topic: Bloomberg:Airbus Says It Must Slash A350 Costs to Win Wide-Body Price War
Replies: 292
Views: 33919

Re: Bloomberg:Airbus Says It Must Slash A350 Costs to Win Wide-Body Price War

One thing I am watching the NMA for is to see which new systems on the 787 and 777x follow on, will it have: 1. Bleedless engines / electric architecture as the 787 does, or revert to a full bleed air system. 2. Have CFRP barrels been a good choice or is sections better. For a number of engineering ...

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by JayinKitsap
Mon Jun 24, 2019 5:32 am
Forum: Civil Aviation
Topic: Business Risk for Boeing: The A321XLR
Replies: 409
Views: 45528

Re: Business Risk for Boeing: The A321XLR

There appears to be more than enough space between the NB and WB to fit in a NMA at rate 14. The A321 may do excellent at longer ranges that current, but the upper left of the pax / range chart is begging to be filled. If 2 NMA flights replace 3 738 flights that is 2 less pilots, 1 less set of land...

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by JayinKitsap
Sun Jun 23, 2019 11:17 pm
Forum: Civil Aviation
Topic: Business Risk for Boeing: The A321XLR
Replies: 409
Views: 45528

Re: Business Risk for Boeing: The A321XLR

There appears to be more than enough space between the NB and WB to fit in a NMA at rate 14. The A321 may do excellent at longer ranges that current, but the upper left of the pax / range chart is begging to be filled. If 2 NMA flights replace 3 738 flights that is 2 less pilots, 1 less set of landi...

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by JayinKitsap
Sun Jun 23, 2019 10:53 pm
Forum: Civil Aviation
Topic: Bloomberg:Airbus Says It Must Slash A350 Costs to Win Wide-Body Price War
Replies: 292
Views: 33919

Re: Bloomberg:Airbus Says It Must Slash A350 Costs to Win Wide-Body Price War

IMO, it’s just too easy to compare the B789 versus the A359 and ignore the differences. Calling it a red herring, state an opinion as a fact and don’t come with the numbers don’t change that. You can do better. Now we have to put the toys back into the tram, even though there's plenty of numbers in...

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by JayinKitsap
Sun Jun 23, 2019 4:21 am
Forum: Civil Aviation
Topic: How much range is too much?
Replies: 30
Views: 5170

Re: How much range is too much?

I read recently (can't find the link) that with all other things equal for a specific flight, a plane designed for 2,000 miles less range saves 6% of the fuel cost, due to its lighter weight. The 77W - 77L comparison is excellent. The 77W hit the sweet spot, the 77L has more range at the expense of ...

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