It would be kinda cool to see a 732 with winglets… taking off from a gravel strip. But alas, it’ll never happen. https://aviation.stackexchange.com/questions/43648/why-has-boeing-used-mini-winglets-on-the-737-200 Looks like there was a winglet for the 732. Must have been quite uncommon though. 7669...
Jump to postIs this company in possession of Catalina tooling? I want to say it’s possible to restart production without tooling, can’t believe it’s easy though. I believe the recent run of ME-262s was done without the original production tooling. They restarted ME 262 production? Link me please! Here are the ...
Jump to post@dlednicer, getting back to the L/D - could you share the data/sources you used to calculate the value for the Comet 1? It would be incredibly interesting to compare the Comet 1 with the Comet 4 also! The math is: GW = 85,000 lbs Sref = 2,015 feet2 AR = 6.56 e = 0.60 (a guess - I find that e falls ...
Jump to postI found a Comet I flight manual online. Working with that and other information I have on hand, I put together a performance model of the aircraft. For a M=0.732 35,000 foot 85,000 lbs cruise point, I see a L/D of 11.2
Jump to postThis website is no longer online, buy you can look at it on the Wayback Machine: https://web.archive.org/web/20140517190531/http://mrcabinpressure.com/ This page lists maximum cabin pressure differential for a lot of aircraft: https://web.archive.org/web/20140516125351/http://mrcabinpressure.com/air...
Jump to postThe upper figure is from Ed Obert's book "Aerodynamic Design of Transport Aircraft". The second figure is from a Royal Aeronautical Society paper "The Development of the Trident Series" by J.P. Smith
Jump to postYou might notice that the root airfoil also has negative camber and camber increases as you go spanwise. On swept wings, the isobars cross the centerline with no sweep. This causes an unsweeping of the isobars in the wing root region, as they curve to go from one side to another on centerline. This ...
Jump to postA friend invited me along for Boeing Family Day last Sunday (8/21). Poking around, we found ln 1573 and 1574 still on the assembly line, mixed in with 767 freighters and KC-46s. 1574 is still in sections, and has not been joined yet.
Jump to postAnd sometimes, ventral fins aren't needed:
And, sometimes the added appendages do impact stability, so we add ventral fins:
Not all protrusions have the same impact. Objects with rounded trailing edges don't produce much lift or side force (depending on how they are oriented) and thus don't have much of an impact. The radome on the top of the forward fuselage of these aircraft has a relatively small impact on stability (...
Jump to postThe concept of Center of Pressure if fictitious. In a college course on statics, one of the first things you are taught about is a couple, which is two equal and opposite forces producing a moment with no net force. Most engineers seem to forget about this after the final exam. I was among the guilt...
Jump to postThis should answer your questions: https://ntrs.nasa.gov/api/citations/199 ... 052267.pdf
Jump to postThe DC-9, MD80 and MD90 have a vortilon, which is a vortex generator, below each wing leading edge at roughly midspan. 1410145 DC-10s and MD11s have nacelle strakes, which produce a vortex that interacts with the wing flow field. As such, you could count them as wing vortex generators. A lot of othe...
Jump to postMax Q wrote:Can’t think of any negatives with a nice tall landing gear, it gives good clearance from the possibility of tail, wingtip or engine nacelle strikes and allows for easy fuselage stretches
On the GII/III you need an improved internal core/bypass mixer, an exhaust/external mixer and an ejector to meet the noise requirements. The RQLP GII hush kit started life with a retractable ejector, but they didn't meet the noise requirements, so the ejector was lengthened until they met the noise ...
Jump to postA Boeing old timer told me that they picked the height of the door sill above the ground on the 707 to match that of the DC-6.
Jump to postI taught Applied Aero at Cal Poly earlier this year and recommended that my students become familiar with: Hoerner "Fluid Dynamic Drag" and "Fluid Dynamic Lift" Ed Obert "Aerodynamic Design of Transport Aircraft" Ted Lomax "Structural Loads Analysis for Commercial ...
Jump to postThe surviving API 747-200 winglet is on display in front of the Museum of Flight in Seattle: https://img.geocaching.com/waymarking/d ... 80b753.jpg
Jump to postOne of the remaining 747-200 proof of concept winglets is on display out front of the Museum of Flight in Seattle: https://img.geocaching.com/waymarking/d ... 80b753.jpg
(I worked on the program)
The picture of the United 737-9 MAX seen above shows it carrying a Boeing Tri-band Radome. Its 92.4 inches long, 11 inches high and 42.3 inches wide. Different antennas can be put below it. Gimbaled antennas are installed below it (in contrast to the semi-phased arrays used with the Gogo 2Ku). The a...
Jump to postThe only satcom radome available for line fit on the 737MAX is the Boeing Tri-band Radome. As Boeing notes "Sized to fit a wide range of Ku and Ka antennas from Panasonic, Honeywell, ViaSat, Global Eagle Entertainment (TECOM), and others."
Jump to postThe Fokker F60 was officially the Model 0604. It was originally civil-certified under DGAC Type Certificate T-050-87. Upon the creation of EASA, this became EASA TCDS EASA.A.036. In addition, the F60 was military-certified in the Netherlands under KLu TCDS Number 4.
Jump to post2 is the LiveTV satcom dome containing a TV downlink antenna. These have now all been replaced on the JetBlue aircraft with the FlyFi domes that cover the TV downlink antenna and broadband uplink/downlink antenna. Also, you don't have them marked, but there are two ADF antennas ahead of the satcom d...
Jump to postWhen you have a protrusion sticking straight up out of a surface over which air flows, an interference vortex called a "horseshoe vortex" will form around the base of that protrusion. http://3.bp.blogspot.com/-YXJa6cxzjj8/Ty1w7vk5EII/AAAAAAAACb0/lINS1vmhfUQ/s1600/Horseshoe-vortex.jpg The ...
Jump to postI bought a copy of the SAE paper. It indicates that the nose gear just rotates as a unit. However, the aft main gear bogies also steer, at 1/3 of the nose gear angle.
Jump to postThe fuselage skin has to be accessible for periodic inspections. Every time someone does a skin inspection, they would have to peel them off.
Jump to postI’m not sure about what providers there are. However, it should work, as there’s still internet on jets at low altitude. Also, can a Q400 for example be retrofitted with a receiver by cutting a hole in the top of the fuselage to mount the receiver? Air-to-satellite (ATS) systems are not installed b...
Jump to postElshad wrote:Isn’t the KC-46 fuselage slightly longer?
There were at least three 707 hushkit types: 1. Long-duct nacelle (N88ZL) 2. Comtran v1 with longer bypass duct, original intake (N707JT, VH-XBA) 3. Comtran v2: longer intake and bypass duct (on many 320C versions in the 90s) N88ZL has the Burbank Aeronautical/Quiet Skies hush kit for the 707. On t...
Jump to postBoeing engineers laid out the rationale for the design of the 787 nose in AIAA paper 2005-0422 "Optimizing Flight Deck Noise". The started with the knowledge that minimizing the flow velocity over the cockpit windows reduces cockpit noise. Then, they shaped the nose accordingly, to both re...
Jump to postAs 747Whale said, its very complicated. The fuselage nose shape causes the flow to accelerate, but then it slows down aft of this. Over the wing, the flow is accelerated again, and then slows down again. Here are CFD pictures of the calculated pressure distribution on a 737-700 at cruise conditions....
Jump to postYou are looking for a valuable commodity. I paid to have a CAD model of the outside surfaces of a 208B built from a laser scan and it cost $30k. Models of the internal structure are even more expensive to acquire. We scanned all of the internal structure of a GIV wing (using a wing from a scrapped a...
Jump to post747-2J9F cn 21668/ln 400 was being built for the IIAF when the revolution happened. It was stored, mostly-completed at Paine Field (I saw it there in 1983). In 1986 it was modified to a civil configuration and sold to Northwest Airlines. A friend of mine, who has flown it, tells me that it had an od...
Jump to post> The Hondajet is an example of over the wing. No other business jet does this. The Scaled Composites Triumph also had an over-the-wing engine installation. It was also the first airplane to fly with FJ44 engines. I did the aero design of the nacelle installation and will say that it wasn't easy. 17...
Jump to postThose are the original Nordam hushkits. As they added a drag decrement, a completely internal mixer hushkit was later developed.
Jump to postGet a copy of Fred Obert's book "Aerodynamic Design of Transport Aircraft"
Jump to postI'm joining this conversation rather late, so I apologize if someone has already commented on this. It was not commented on much, but this morning's launch out of Vandenberg AFB, besides carrying the Spanish Paz satellite, also carried SpaceX's Microsat-2a and Microsat-2b prototypes. The plan is to ...
Jump to postThe 747-200 and -300 wings have common OMLs. This is some information that Boeing published in an AIAA technical paper; It shows that the extended upper hump of the 747-300 and 747-400 improves the transonic area ruling of the aircraft. This increases the drag divergence Mach number of the aircraft....
Jump to postAPU inlet and exhaust are visually different. Split winglets. Engines of course. Many have a SATCOM dome on top. Most of the SATCOM atenna thee days are flush mounted.An example would be the BALL SATCOM on Trumps 757 which is slightly aft of the 1L and 2L doors, Hard to see, but its there. I think ...
Jump to postTake a look at:
http://lessonslearned.faa.gov/Comet1/G-ALYP_Report.pdf
Here is what is involved:
https://vimeo.com/70133676
https://www.youtube.com/watch?v=2WMuxEJraPc
I've been to the B-52 Victory Museum and the nearby Hồ Bảy Gian. Here is a picture of the wreckage in the lake
Or contact me here!
I am pretty sure that they were designed with NACA 0012 airfoils.
Ka can provide higher individual bandwidth, but is vulnerable to atmospheric moisture. Right now, there is more total Ku bandwidth available than Ka, but this will change. Connectivity (satellite) providers are: Intelsat Ku and Ka Eutelsat Ku and Ka Hughes Ku and Ka SES Ku Inmarsat Ka Viasat Ka Tele...
Jump to postI believe the location of the blister is defined by where it can ideally benefit from Area Rule. If there is a location along the roof where there's an optimum place then that's where it goes, where the dimensions of the body are such that adding the blister does the most good for this. No. There i...
Jump to postI used to get altitude sickness on airliners. Now, I drink coffee before and on a flight and don't have the problem. Thanks to the drug Diomox, I have spent extensive time on the ground at high altitudes (above 8,000 feet), without many problems. On one trip, we spent a week at 12,000 feet and above...
Jump to postThe Vmo/Mmo of the 737-8 MAX is listed on the Revision 58 of the A16WE Type Certificate Data Sheet as "VMO/MMO - 270 KCAS/0.82M for extension, 320 KCAS for extended, 235 KCAS for retraction of gear)." Does anyone know: is the Vmo/Mmo for the MAX truly 270/.82? Or, are these gear extension ...
Jump to postThere is a whole chapter on this in Fred Obert's book "Aerodynamic Design of Transport Aircraft"
Jump to post