Search found 115 matches

by RJMAZ
Tue Oct 17, 2017 1:52 am
Forum: Civil Aviation
Topic: Boeing officially forms program office to flesh out 797 plans
Replies: 380
Views: 46433

Re: Boeing officially forms program office to flesh out 797 plans

Given the Bombardier/Airbus announcement of a partnership on the C-Series - this may cause Boeing to due some new calculus on the MOM. I would guess Airbus expands the CS to 500 and 700 versions possibly with a new wing which allows them to focus on the A320/A321 size and either speed up a rewing i...

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by RJMAZ
Tue Oct 17, 2017 1:41 am
Forum: Civil Aviation
Topic: Breaking: Airbus and Bombardier Announce C Series Partnership
Replies: 662
Views: 37486

Re: Breaking: Airbus and Bombardier Announce C Series Partnership

Those who think Bombardier got a bad deal. Look at the options. 1) Go bankrupt and loose all cash flow from every program. The Q400 would also die during the bankruptcy. The Canadian government never gets paid back. 2) Give away half of c series program. The Canadian government will eventually get s...

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by RJMAZ
Mon Oct 16, 2017 9:57 pm
Forum: Civil Aviation
Topic: Boeing officially forms program office to flesh out 797 plans
Replies: 380
Views: 46433

Re: Boeing officially forms program office to flesh out 797 plans

If Boeing were to design a folding wing for the 797, how expensive would it be to design a second wing option of the same size that doesn't fold? So the solid wing has more room for fuel? As this looks like it will be a large but short range widebody fuel volume won't be an issue. The wing will be ...

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by RJMAZ
Mon Oct 16, 2017 9:45 pm
Forum: Civil Aviation
Topic: Boeing officially forms program office to flesh out 797 plans
Replies: 380
Views: 46433

Re: Boeing officially forms program office to flesh out 797 plans

Wouldn't a pilot shortage lead airlines to want to upsize there smallest aircraft? I think they would be more likely to get rid of there Single Aisles and go the 797 route and abuse them on distances under 2,000 NM vs taking a very heavy widebody and doing the same. A 797 should be more efficient t...

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by RJMAZ
Mon Oct 16, 2017 9:22 pm
Forum: Civil Aviation
Topic: Boeing officially forms program office to flesh out 797 plans
Replies: 380
Views: 46433

Re: Boeing officially forms program office to flesh out 797 plans

a 7 seat elipse is only about 18-19% more cross section than an A320 for 16.6% more seats in Y - Thanks :) I don't think a true eclipse will work. But now you are comparing a 7AB oval to a 6AB circle. True you may be able to match the cross section area per seat. This would allow for per seat fuel ...

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by RJMAZ
Mon Oct 16, 2017 9:53 am
Forum: Civil Aviation
Topic: Boeing officially forms program office to flesh out 797 plans
Replies: 380
Views: 46433

Re: Boeing officially forms program office to flesh out 797 plans

What you say above about the diameter relative to to the A300 tube is rather striking . Is it accurate that the 767 has a 5.03m diameter? 767 - 5.03m exterior width. 4.72m cabin width. 5.41m exterior height. Its taller than it is wide. a330 5.64m exterior width and height. 5.28m cabin width. The 76...

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by RJMAZ
Mon Oct 16, 2017 7:00 am
Forum: Civil Aviation
Topic: Boeing officially forms program office to flesh out 797 plans
Replies: 380
Views: 46433

Re: Boeing officially forms program office to flesh out 797 plans

That would probably be too much capacity to what have been proposed, hence most likely it won't go to 8-abreast, and could instead be 7-abreast. As a widebody it could also start at a length shorter than A321 7 abreast can't match the economics of a 6 abreast. Assuming 18inch seats and 18inch aisle...

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by RJMAZ
Sun Oct 15, 2017 1:22 pm
Forum: Civil Aviation
Topic: Boeing officially forms program office to flesh out 797 plans
Replies: 380
Views: 46433

Re: Boeing officially forms program office to flesh out 797 plans

I think many are overthinking the Seating Capacity of the 797. I think you have to think of it in Single Aisle Terms - If an A321 is 230-240 in Sardine Class - the 797 would be 270-280 in sardine configuration, same length (or a little shorter to keep weight down) but 1 seat wider. If an AA 321 V3 ...

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by RJMAZ
Sun Oct 15, 2017 11:08 am
Forum: Civil Aviation
Topic: Boeing officially forms program office to flesh out 797 plans
Replies: 380
Views: 46433

Re: Boeing officially forms program office to flesh out 797 plans

[quote="Eyad89"]your proposed 797-10 would be 58m long with 8 seats per row. That is the exact size of A338/A332. But you assumed that it would be lighter by 35t or 41%. That’s a lot. Composite materials wouldn’t do that much alone. How smaller did you make its wings, and how smaller is it...

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by RJMAZ
Sat Oct 14, 2017 12:21 am
Forum: Civil Aviation
Topic: Boeing officially forms program office to flesh out 797 plans
Replies: 380
Views: 46433

Re: Boeing officially forms program office to flesh out 797 plans

Is there a rule that says you have to have 2" armrests. If you go 1.5" on the aisle and window seats on the outer seats and 1.5"s on both the armrests for the aisle seats on the set of 4 inner seats you can have 18" seats all across. You could do that but you don't gain any extr...

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by RJMAZ
Fri Oct 13, 2017 10:24 pm
Forum: Civil Aviation
Topic: Boeing officially forms program office to flesh out 797 plans
Replies: 380
Views: 46433

Re: Boeing officially forms program office to flesh out 797 plans

http://members.iinet.net.au/~1300subbox/767-797.jpg Another cross section idea using a simple circular fuselage for a tight 8 abreast. 30cm narrower than the A330 tube and 30cm wider than the 767 comfortable 7AB. Using the narrower LD2 containers allows them to sit slightly lower down as you can se...

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by RJMAZ
Fri Oct 13, 2017 1:01 pm
Forum: Civil Aviation
Topic: Boeing officially forms program office to flesh out 797 plans
Replies: 380
Views: 46433

Re: Boeing officially forms program office to flesh out 797 plans

I made it myself. For the specs I based the smallest size off the A310-300, length and wingspan. The A310-300 has a 77T empty weight, 164T MTO with a range of 5150nm using 61,000L of fuel. With modern engines I estimated range would increase to 6300nm. Probably too much range, so it could be made li...

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by RJMAZ
Fri Oct 13, 2017 9:16 am
Forum: Civil Aviation
Topic: Boeing officially forms program office to flesh out 797 plans
Replies: 380
Views: 46433

Re: Boeing officially forms program office to flesh out 797 plans

It isn't a sphere... It isn't even circular The skin is evenly loaded. As there is a floor beam you can think of the upper and lower lobes as separate pressure vessels. The only stress point on the skin is where the floor joins on the side which is reinforced by the floor beam. Quite a few aircraft...

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by RJMAZ
Fri Oct 13, 2017 8:41 am
Forum: Civil Aviation
Topic: what transatlantic markets could the 797/MOM open up?
Replies: 65
Views: 7245

Re: what transatlantic markets could the 797/MOM open up?

.. and the reverse for the sides. You put the floors into compression to keep the form. Bad design. Any oval design where it is wider than it is high would also have the floor under compression. That is not a deal breaker. My design avoids any flex in the skin as the upper and lower lobes are still...

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by RJMAZ
Fri Oct 13, 2017 7:37 am
Forum: Civil Aviation
Topic: 2020+ Narrowbody Market
Replies: 23
Views: 1855

Re: 2020+ Narrowbody Market

I predict there will be a massive upgauging on the narrowbody network. This trend has been ongoing for decades. The 737 and A320 families have been growing in length and the sales have been increasing for the longer member of the families. This demand will be met by the MOM the first short route opt...

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by RJMAZ
Fri Oct 13, 2017 5:33 am
Forum: Civil Aviation
Topic: Boeing officially forms program office to flesh out 797 plans
Replies: 380
Views: 46433

Re: Boeing officially forms program office to flesh out 797 plans

I'd be curious what a 788 with the same improvements and MTOW as the 789 has would do for range.... putting it somewhere around 8000-8200nmi, essentially a smaller, more efficient 777-8X for ULH. The 787-8ER would be a simple addition to the family. However I can't see a huge market for it. Maybe 1...

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by RJMAZ
Fri Oct 13, 2017 5:11 am
Forum: Civil Aviation
Topic: Boeing officially forms program office to flesh out 797 plans
Replies: 380
Views: 46433

Re: Boeing officially forms program office to flesh out 797 plans

An interesting graphic. The 787-8 would most likely be made redundant by the 797-10, sizewise. I wonder, in this scenario, if the -8 or -10 would have different engines/wings over the other two models. The 787-8 has not had a large order for a very long time. It also doesnt share many parts with it...

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by RJMAZ
Fri Oct 13, 2017 4:06 am
Forum: Civil Aviation
Topic: Boeing officially forms program office to flesh out 797 plans
Replies: 380
Views: 46433

Re: Boeing officially forms program office to flesh out 797 plans

That cross section provides perfect loading under pressure. Similar to an ATR72. It provides 90% of the advantages of an oval design in terms of surface area and none of the disadvantages. An oval design simply wont work and will always be trying to form a circle under pressure. So it would need to ...

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by RJMAZ
Fri Oct 13, 2017 2:47 am
Forum: Civil Aviation
Topic: Boeing officially forms program office to flesh out 797 plans
Replies: 380
Views: 46433

Re: Boeing officially forms program office to flesh out 797 plans

Scores of thousands of kilograms less weight is what justifies it. The 787-8 has an OEM OEW of 118,000kg. I expect MoM to come in around the 85,000 kilogram mark (around a 767-300ER). That is over 50,000 kilograms lighter and that is going to be huge in terms of trip fuel savings. That will also al...

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by RJMAZ
Fri Oct 13, 2017 1:44 am
Forum: Civil Aviation
Topic: what transatlantic markets could the 797/MOM open up?
Replies: 65
Views: 7245

Re: what transatlantic markets could the 797/MOM open up?

Nicely done. So you took two 757 tubes, squished them together until everything fit, gave it a common wing & engines and stretched it twice. Who'd a thunk it?? The range & load combinations add much flexibility. :thumbsup: Everyone likes the A-340 two-four-two seating plus it can haul LD-3s...

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by RJMAZ
Thu Oct 12, 2017 11:15 pm
Forum: Civil Aviation
Topic: what transatlantic markets could the 797/MOM open up?
Replies: 65
Views: 7245

Re: what transatlantic markets could the 797/MOM open up?

http://members.iinet.net.au/~1300subbox/797.jpg Assuming a 3 length family the shortest model would have range 25+% greater than the A321LR and the 757. This would open up every east coast city of the US with middle Europe. The two longer models won't open up any new routes. They will be to upsize ...

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by RJMAZ
Mon Oct 09, 2017 12:28 pm
Forum: Civil Aviation
Topic: Hawaiian Airlines having second thoughts on A330neos, could order 787's instead
Replies: 259
Views: 37269

Re: Hawaiian Airlines having second thoughts on A330neos, could order 787's instead

[Wow, that is some accusation that you are making. Airbus is lying about the A330 and is using 9-abreast seating for economics but is marketing the aircraft at 8-abreast for comfort. Do I have that right?. Yes. Its the only explanation. The A330 is sold and marketed with 9 abreast. Its CASM advanta...

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by RJMAZ
Mon Oct 09, 2017 6:33 am
Forum: Civil Aviation
Topic: Hawaiian Airlines having second thoughts on A330neos, could order 787's instead
Replies: 259
Views: 37269

Re: Hawaiian Airlines having second thoughts on A330neos, could order 787's instead

Can we really say that before the A330NEO flies for the first time? I know folks have projections but it seems a bit premature. I honestly can't see how the A330NEO is competitive even on short trips. Weight and dimensions of the A330-900 closely match the 787-9. Wing size, length, max takeoff weig...

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by RJMAZ
Mon Oct 09, 2017 5:37 am
Forum: Civil Aviation
Topic: The Telegraph article: "Is this the beginning of the end for the world's biggest passenger plane?" (=A380)
Replies: 61
Views: 15572

Re: The Telegraph article: "Is this the beginning of the end for the world's biggest passenger plane?" (=A380)

4 engines has very little to do with the A380 not selling. A 4 engine aircraft has one big advantage no one has yet mentioned. A 4 engine aircraft can have a lower thrust to weight ratio with all engines running. A twin engine aircraft must have enough power to climb with only one engine. When cruis...

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by RJMAZ
Mon Oct 09, 2017 12:32 am
Forum: Civil Aviation
Topic: Hawaiian Airlines having second thoughts on A330neos, could order 787's instead
Replies: 259
Views: 37269

Re: Hawaiian Airlines having second thoughts on A330neos, could order 787's instead

You guys are comparing seats capacity like its the most important. When a plane is 10% smaller or bigger it makes no difference when you have a dozen flights a week on a route. Airlines purchase on per seat costs. They can fly more smaller planes or less bigger planes. I think the 787 is now proving...

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by RJMAZ
Thu Oct 05, 2017 12:50 am
Forum: Military Aviation & Space Flight
Topic: Germany Considers Tornado Replacement
Replies: 159
Views: 20889

Re: Germany Considers Tornado Replacement

Given Boeing is competing against both LM and Leonardo who have in production T-X candidate aircraft I think that claim is more marketing than fact. But that still doesn't change the requirements for a 5th gen platform against a simple supersonic trainer. The level of complexity between the two is ...

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by RJMAZ
Wed Oct 04, 2017 10:46 pm
Forum: Military Aviation & Space Flight
Topic: Germany Considers Tornado Replacement
Replies: 159
Views: 20889

Re: Germany Considers Tornado Replacement

The only evidence you have for creating a 5th gen fighter so quickly and cheaply is Boeing development of their T-X, a cheap supersonic trainer that is not a production aircraft but a risk reduction concept that will see significant revision and alteration if it gets selected for the T-X competitio...

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by RJMAZ
Wed Oct 04, 2017 11:57 am
Forum: Military Aviation & Space Flight
Topic: Germany Considers Tornado Replacement
Replies: 159
Views: 20889

Re: Germany Considers Tornado Replacement

According to the Russians the Su-57 was not built in the 80s, the J-20 certainly wasn't nor was the F-35. All three were built in the digital age but all three have gone through extensive flight test programs and all, from the variation in the test frames, have required modifications to allow them ...

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by RJMAZ
Wed Oct 04, 2017 10:33 am
Forum: Military Aviation & Space Flight
Topic: Germany Considers Tornado Replacement
Replies: 159
Views: 20889

Re: Germany Considers Tornado Replacement

If all that was possible don't you think Japan, Turkey and South Korea who are all pursuing 5th gen platforms, would have aircraft in service by now? Instead they are also looking at 15+ year development time frames. My post only applies to the countries that have developed 4th generation fighters ...

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by RJMAZ
Wed Oct 04, 2017 10:13 am
Forum: Military Aviation & Space Flight
Topic: Germany Considers Tornado Replacement
Replies: 159
Views: 20889

Re: Germany Considers Tornado Replacement

I'm with you on most of this except the last bit. No way anyone can build and field a 5th gen platform in five years, regardless of tech readiness levels. You are wrong. I can assure you it is definitely possible. For the last few years there has been massive improvements in CAD design and automati...

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by RJMAZ
Wed Oct 04, 2017 4:18 am
Forum: Military Aviation & Space Flight
Topic: Germany Considers Tornado Replacement
Replies: 159
Views: 20889

Re: Germany Considers Tornado Replacement

The manufacturers of the Eurofigher, Gripen and Rafale could easily combine to develop a 5th generation stealth multi role aircraft. Avionics and software has overtaken the airframe and engines as the most difficult and costly part of a new fighter development. Using off the shelf avionics and softw...

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by RJMAZ
Mon Oct 02, 2017 1:26 pm
Forum: Civil Aviation
Topic: Boeing officially forms program office to flesh out 797 plans
Replies: 380
Views: 46433

Re: Boeing officially forms program office to flesh out 797 plans

To me, this all still sounds a lot like "we want widebody with narrowbody economics", and I have two problems with that. One, it may not be in the manufacturers' interest to make that happen, because it will cannibalise too much of other products. And second, it may not be possible. The e...

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by RJMAZ
Mon Oct 02, 2017 5:27 am
Forum: Civil Aviation
Topic: Boeing officially forms program office to flesh out 797 plans
Replies: 380
Views: 46433

Re: Boeing officially forms program office to flesh out 797 plans

Those who are saying the A322 would have an empty weight higher than the MOM are drawing a long bow. Who says the MOM needs to have 4500+nm range? The main market for this aircraft will be short thick routes NOT long thin routes. Airbus could do a simple stretch exchanging range for payload. The A32...

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by RJMAZ
Mon Oct 02, 2017 3:43 am
Forum: Civil Aviation
Topic: Domestic Widebody Routes Japan
Replies: 6
Views: 988

Re: Domestic Widebody Routes Japan

While short-haul widebodies can be efficient, that is not a trivial statement because widebodies are a lot heavier than narrow bodies. And a very large supply of seats in a single departure simply leads to dilution: too much product that needs be pushed out with heavy discounting. I'd be curious to...

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by RJMAZ
Mon Oct 02, 2017 2:41 am
Forum: Civil Aviation
Topic: Domestic Widebody Routes Japan
Replies: 6
Views: 988

Re: Domestic Widebody Routes Japan

JAL has 767-300 and 767-300ER doing short domestic routes pretty much between all major cities. They also have a dozen 777-200's in domestic config. South Korea and China are a pretty short distance too. I did a fair bit of research on short haul widebody routes in Asia but I only gathered informati...

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by RJMAZ
Thu Sep 28, 2017 10:45 am
Forum: Civil Aviation
Topic: Today's amazing backlogs for aircraft
Replies: 4
Views: 1567

Re: Today's amazing backlogs for aircraft

The longer the backlog the further into the future airlines must look.

They are ordering replacements for aircraft that still have life left.

Its nearly at the point where they are ordering just so they are in the queue. They can always take delivery earlier or later.

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by RJMAZ
Thu Sep 28, 2017 5:47 am
Forum: Civil Aviation
Topic: Boeing officially forms program office to flesh out 797 plans
Replies: 380
Views: 46433

Re: Boeing officially forms program office to flesh out 797 plans

8 abreast and only LD3/45s will be very hard pressed to take the luggage of the passengers in a higher density configuration. Maybe for international flights but not for domestic. 2-4-2 will have plenty of overhead storage. I have flown a dozen of jetstar Australia flights using A320's and have onl...

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by RJMAZ
Thu Sep 28, 2017 5:34 am
Forum: Technical/Operations
Topic: Is the A380 a "hard lander"?
Replies: 40
Views: 6828

Re: Is the A380 a "hard lander"?

That's not why a good landing should be firm: 1) Recently the FAA started stressing more accurate landings with wheels meeting the pavement as close to the touchdown zone as practical. This was because of concerns regarding long landings and runway overruns. Firm landings are more precise in touchd...

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by RJMAZ
Thu Sep 28, 2017 3:42 am
Forum: Civil Aviation
Topic: U.S. Dept of Commerce backs Boeing in dispute with Bombardier
Replies: 1093
Views: 41625

Re: Boeing targets Bombardier for “price dumping” CSeries

Newbie-ish question that might be out of place here, but I don't know where else to put it: What is it about the C-Series that scares Boeing (and to a lesser extent Airbus) so much, while they seem to get along with Embraer's offerings? The potential for a CS500 or 700? If Boeing does nothing the C...

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by RJMAZ
Thu Sep 28, 2017 3:14 am
Forum: Civil Aviation
Topic: Boeing officially forms program office to flesh out 797 plans
Replies: 380
Views: 46433

Re: Boeing officially forms program office to flesh out 797 plans

WE looked at it before. Technically possible, but a large aircraft still, but price wise it probably couldn't compete e.g. 200-240 seats single class over 500-1500NM. And that's a huge segment. Actually short distance efficiency is directly connected to aircraft weight per passenger. My rough numbe...

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by RJMAZ
Thu Sep 28, 2017 12:14 am
Forum: Civil Aviation
Topic: Boeing officially forms program office to flesh out 797 plans
Replies: 380
Views: 46433

Re: Boeing officially forms program office to flesh out 797 plans

The result would be better than the 787-3, but still has a lot more weight and drag per passenger to deal with the A321LR. Actually a 787-8 at similar weights of the A300/767 would have less weight and drag per passenger. Let's compare 28inch full economy. 787-7: 150T with 381 seats = 393kg per pas...

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by RJMAZ
Wed Sep 27, 2017 11:33 pm
Forum: Civil Aviation
Topic: Boeing officially forms program office to flesh out 797 plans
Replies: 380
Views: 46433

Re: Boeing officially forms program office to flesh out 797 plans

Take the 788 fuselage and put in smaller wings, less thrusty engines, a lighter gear, etc... Highly likely option. A 787-7. The fuselage is the lightest part. Its the wings, wing box, engines and landing gear that determines the range and efficiency of the plane. People say it will be too heavy but...

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by RJMAZ
Wed Sep 27, 2017 11:07 pm
Forum: Civil Aviation
Topic: Boeing officially forms program office to flesh out 797 plans
Replies: 380
Views: 46433

Re: Boeing officially forms program office to flesh out 797 plans

I agree, if they go twin-aisle it has to be 767-300 sized. I am just not convinced that it would be a twin-aisle with 7 seats (a lot of wasted space for 1 extra seat). If you go 8 abreast, now you're talking wide and short...it just doesn't seem efficient. Not really. The 787-8 is not wide and shor...

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by RJMAZ
Wed Sep 27, 2017 10:58 pm
Forum: Civil Aviation
Topic: Boeing officially forms program office to flesh out 797 plans
Replies: 380
Views: 46433

Re: Boeing officially forms program office to flesh out 797 plans

Do we know for sure that a 5500nm design would create that negative feedback loop? Any increase in range for a design will start a negative feedback loop. Adding 1000nm range to a given design would make CASM worse by at least 10%. An additional 1000nm is a 20% range increase for the MOM. So minimu...

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by RJMAZ
Wed Sep 27, 2017 8:02 am
Forum: Civil Aviation
Topic: U.S. Dept of Commerce backs Boeing in dispute with Bombardier
Replies: 1093
Views: 41625

Re: Boeing targets Bombardier for “price dumping” CSeries

Boeing has received much more than $5 billion in tax breaks in the same period of time. However Boeing is a much larger company. So Boeings tax breaks are a very small in proportion to revenue where as Bombardiers cash injections are a massive percentage of its revenue. Don't forget Canada now owns ...

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by RJMAZ
Wed Sep 27, 2017 7:24 am
Forum: Civil Aviation
Topic: U.S. Dept of Commerce backs Boeing in dispute with Bombardier
Replies: 1093
Views: 41625

Re: Boeing targets Bombardier for “price dumping” CSeries

I feel sorry for Bombardier. Its pretty standard practice for any new manufacturer to offer extreme discounts to break into a new market. Once you build up a customer base and a good reputation then you can increase prices and make a profit. I'm Australian and our government would not do something l...

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by RJMAZ
Wed Sep 27, 2017 3:02 am
Forum: Civil Aviation
Topic: Boeing officially forms program office to flesh out 797 plans
Replies: 380
Views: 46433

Re: Boeing officially forms program office to flesh out 797 plans

I don't understand those who claim that 4500nm range will be perfect. In my opinion that is 1000nm too short. It leaves out a lot of TATL and Intra-Asian routes. If they're going to spend billions on making an all new airliner, designing it with too short range would be a massive waste. 5500nm is t...

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by RJMAZ
Wed Sep 27, 2017 2:45 am
Forum: Civil Aviation
Topic: Boeing officially forms program office to flesh out 797 plans
Replies: 380
Views: 46433

Re: Boeing officially forms program office to flesh out 797 plans

So, essentially they want a 767 replacement? The MOM will not be a 767 replacement. It will be a 737 and A320 replacement on thick congested routes. There are a lot of destination pairs that operate 10+ narrowbody flights per day. With shortages of gates in Asia they frequently use widebody aircraf...

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by RJMAZ
Wed Sep 27, 2017 2:04 am
Forum: Civil Aviation
Topic: Cseries orders for 2017
Replies: 173
Views: 46600

Re: Cseries orders for 2017

If a 150-seat CS300 is 20% more economical/efficient than a 156-seat A319, why not give it a try. Not every route needs 186-235 seats. Comparing to the A319 is wrong. If an Airline needs to move 2000 passengers per week between destinations they can achieve that by various sized aircraft. Compare t...

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by RJMAZ
Tue Sep 26, 2017 1:20 pm
Forum: Civil Aviation
Topic: Boeing officially forms program office to flesh out 797 plans
Replies: 380
Views: 46433

Re: Boeing officially forms program office to flesh out 797 plans

He means a widebody with 200-250 pax would only have a few seats more than A322 at the cost of a considerably heavier weight. CASM wouldn't look so attractive. 2-3-2 is just too difficult to be justified when compared to a 3-3 configuration IMO. Why add another isle for the sake of gaining one seat...

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