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Squawking 7700 in the big wide world of aviation. From my own aviation art and photography to all the little vectors I follow to interesting aviation history......
N886DC is a Dassault Falcon 900 belonging to Dulles-based charter operator FJ900. Note the anhedral on the tailplane similar to the Falcon 2000 I previously posted. This design feature to facilitate deep stall recovery is also present on the Falcon 50 and the new Falcon 7X. #Avgeek #aviation #aircraft #planeporn #KIAD #IAD #dulles #airport #planespotting #dassault #falcon900 #N866DC #megaplane #instaplane #instagramaviation #avgeekschoolofknowledge #avgeekery

N886DC is a Dassault Falcon 900 belonging to Dulles-based charter operator FJ900. Note the anhedral on the tailplane similar to the Falcon 2000 I previously posted. This design feature to facilitate deep stall recovery is also present on the Falcon 50 and the new Falcon 7X. #Avgeek #aviation #aircraft #planeporn #KIAD #IAD #dulles #airport #planespotting #dassault #falcon900 #N866DC #megaplane #instaplane #instagramaviation #avgeekschoolofknowledge #avgeekery

19 hours ago
4 notes
Even though the Cessna Citation Excel doesn’t have a T-tail, the location of the horizontal tailplane in relation to the wings does leave it prone to a milder form of deep stall where the wing can blank out the elevators. The nacelle strakes on the MD-80 assist in deep stall recovery and the rear strakes on the Citation Excel serve a very similar role in assisting with stall recovery. The Citation Excel made its first flight in 1996 and is a unique mixture of other proven Cessna Citation designs. The fuselage is that of the Citation X but shortened by 21 feet. The wing is based on the efficient supercritical wing of the Citation Ultra and the empennage is from the Citation V. It’s still in production with over 570 built. #Avgeek #aviation #aircraft #planeporn #Dallas #KDAL #DAL #lovefield #airport  #igtexas  #planespotting #cessna #cessna560 #citationexcel #megaplane #instaplane #instadfw #instagramaviation #avgeekschoolofknowledge #wearetxgmers #N748W #avgeekery (at Dallas Love Field (DAL))

Even though the Cessna Citation Excel doesn’t have a T-tail, the location of the horizontal tailplane in relation to the wings does leave it prone to a milder form of deep stall where the wing can blank out the elevators. The nacelle strakes on the MD-80 assist in deep stall recovery and the rear strakes on the Citation Excel serve a very similar role in assisting with stall recovery. The Citation Excel made its first flight in 1996 and is a unique mixture of other proven Cessna Citation designs. The fuselage is that of the Citation X but shortened by 21 feet. The wing is based on the efficient supercritical wing of the Citation Ultra and the empennage is from the Citation V. It’s still in production with over 570 built. #Avgeek #aviation #aircraft #planeporn #Dallas #KDAL #DAL #lovefield #airport #igtexas #planespotting #cessna #cessna560 #citationexcel #megaplane #instaplane #instadfw #instagramaviation #avgeekschoolofknowledge #wearetxgmers #N748W #avgeekery (at Dallas Love Field (DAL))

1 day ago
6 notes
Now let’s do some advanced level Avgeek School of Knowledge. I posted about this 6 months ago but many of you are new to my IG feed since then so it’s worth a repost. Among the four single aisle Boeing jetliners, the 707, 727, 737, and 757, they all pretty much share the same cross-section of the fuselage *from the cabin floor up*. Where they differ is the DEPTH of the lower fuselage lobe below the cabin floor. The 707’s lower fuselage lobe, for example is a bit deeper than the lower fuselage lobe of the 737. On the 727, it’s a bit of a hybrid- the lower fuselage lobe ahead of the wing is like the 737’s, behind the wing is slightly deeper like the 707’s- the difference is around a foot or so. The “step” is covered by the wing-body fairing so we don’t really notice it. Now most of you know that the 757 is a 727 replacement and early in its design evolution even had a 727 nose and T-tail. After 340 design iterations we got the 757 we all know and love and it looks nothing like a 727. Except it retained that difference in lower fuselage lobe depth forward and aft of the wing just like the 727- when measured off the waterline used as an engineering reference, the aft fuselage lower lobe of the 757 is about 18.5 inches deeper than the forward fuselage lower lobe. That’s sort of like vestigial holdover of the 757’s origins as a 727 replacement. And that’s damn cool. Did everyone take notes? #Avgeek #aviation #aircraft #planeporn #kdfw #dfw #airport  #planespotting #airlines #megaplane #instaplane #boeing #757 #american #dfwavgeek #instagramaviation #igaviationcontest #avgeekschoolofknowledge #N621AM (at DFW Founders Plaza)

Now let’s do some advanced level Avgeek School of Knowledge. I posted about this 6 months ago but many of you are new to my IG feed since then so it’s worth a repost. Among the four single aisle Boeing jetliners, the 707, 727, 737, and 757, they all pretty much share the same cross-section of the fuselage *from the cabin floor up*. Where they differ is the DEPTH of the lower fuselage lobe below the cabin floor. The 707’s lower fuselage lobe, for example is a bit deeper than the lower fuselage lobe of the 737. On the 727, it’s a bit of a hybrid- the lower fuselage lobe ahead of the wing is like the 737’s, behind the wing is slightly deeper like the 707’s- the difference is around a foot or so. The “step” is covered by the wing-body fairing so we don’t really notice it. Now most of you know that the 757 is a 727 replacement and early in its design evolution even had a 727 nose and T-tail. After 340 design iterations we got the 757 we all know and love and it looks nothing like a 727. Except it retained that difference in lower fuselage lobe depth forward and aft of the wing just like the 727- when measured off the waterline used as an engineering reference, the aft fuselage lower lobe of the 757 is about 18.5 inches deeper than the forward fuselage lower lobe. That’s sort of like vestigial holdover of the 757’s origins as a 727 replacement. And that’s damn cool. Did everyone take notes? #Avgeek #aviation #aircraft #planeporn #kdfw #dfw #airport #planespotting #airlines #megaplane #instaplane #boeing #757 #american #dfwavgeek #instagramaviation #igaviationcontest #avgeekschoolofknowledge #N621AM (at DFW Founders Plaza)

2 days ago
8 notes
This is N424AA, the second oldest active McDonnell Douglas MD-80 in the American fleet, delivered to the airline on 5 November 1986. If this plane is still flying for American in two years, it will have racked up thirty years in service with American. Even if it’s retired in the next two years, it’s still an enviable tenure of service for a single airline. For the record, the oldest active MD-80 at American is N403A, delivered 24 February 1986 to the airline. #Avgeek #aviation #aircraft #planeporn #kdfw #DFW #airport #igtexas #planespotting #airlines #McDonnellDouglas #MD80 #American #dfwavgeek #instadfw #instagramaviation #N424AA #avgeekery #avgeekschoolofknowledge #instaspotting (at DFW Founders Plaza)

This is N424AA, the second oldest active McDonnell Douglas MD-80 in the American fleet, delivered to the airline on 5 November 1986. If this plane is still flying for American in two years, it will have racked up thirty years in service with American. Even if it’s retired in the next two years, it’s still an enviable tenure of service for a single airline. For the record, the oldest active MD-80 at American is N403A, delivered 24 February 1986 to the airline. #Avgeek #aviation #aircraft #planeporn #kdfw #DFW #airport #igtexas #planespotting #airlines #McDonnellDouglas #MD80 #American #dfwavgeek #instadfw #instagramaviation #N424AA #avgeekery #avgeekschoolofknowledge #instaspotting (at DFW Founders Plaza)

4 days ago
10 notes
Ever wonder why the main gear bogies on the 767 tilt “toes down”? The pivot axis for the main landing gear leg isn’t parallel to the long axis of the fuselage- when retracted, the main gear leg angles forward due to its attachment point to the wing spar. So to get the main gear into the smallest space available in the main gear well, the long axis of the truck has to be parallel to the keel beam/long axis of the fuselage. When the gear retracts, those toes-down bogies end up parallel to the keel beam. Bottom line, they tip forward to fit in the well! If any if you are 767 drivers, please chime in and correct me! #Avgeek #aviation #aircraft #planeporn #dulles #KIAD #IAD #airport #planespotting #airlines #megaplane #instaplane #boeing #767 #united  #instagramaviation #avgeekschoolofknowledge #N665UA #igaviationcontest

Ever wonder why the main gear bogies on the 767 tilt “toes down”? The pivot axis for the main landing gear leg isn’t parallel to the long axis of the fuselage- when retracted, the main gear leg angles forward due to its attachment point to the wing spar. So to get the main gear into the smallest space available in the main gear well, the long axis of the truck has to be parallel to the keel beam/long axis of the fuselage. When the gear retracts, those toes-down bogies end up parallel to the keel beam. Bottom line, they tip forward to fit in the well! If any if you are 767 drivers, please chime in and correct me! #Avgeek #aviation #aircraft #planeporn #dulles #KIAD #IAD #airport #planespotting #airlines #megaplane #instaplane #boeing #767 #united #instagramaviation #avgeekschoolofknowledge #N665UA #igaviationcontest

5 days ago
11 notes
Since we’re discussing aircraft design features to facilitate recovery from deep stall situations, this Dassault Falcon 2000 exiting Runway 19C at Washington Dulles shows Dassault’s approach on the Falcon 2000- note the tailplane anhedral, this puts the outer part of the tailplane outside of the region where it would get blanked out in a deep stall event. This is the same reasoning behind the marked anhedral of the F-4 Phantom’s tailplane. #Avgeek #aviation #aircraft #planeporn #KIAD #IAD #dulles #airport #planespotting #dassault #falcon2000 #megaplane #instaplane  #instagramaviation #avgeekschoolofknowledge  #avgeekery

Since we’re discussing aircraft design features to facilitate recovery from deep stall situations, this Dassault Falcon 2000 exiting Runway 19C at Washington Dulles shows Dassault’s approach on the Falcon 2000- note the tailplane anhedral, this puts the outer part of the tailplane outside of the region where it would get blanked out in a deep stall event. This is the same reasoning behind the marked anhedral of the F-4 Phantom’s tailplane. #Avgeek #aviation #aircraft #planeporn #KIAD #IAD #dulles #airport #planespotting #dassault #falcon2000 #megaplane #instaplane #instagramaviation #avgeekschoolofknowledge #avgeekery

20 hours ago
4 notes
In my recent post about the purpose of the nose strakes on the MD-80, a question came up regarding the purpose of the strakes on the engine nacelles on the MD-80 that you can see here on my photograph of N984TW landing. Those strakes are there for stall recovery- like any T-tailed aircraft, the MD-80 has a series of “fixes” to prevent a deep stall where the stalled wing blanks out the tail in certain flight regimes, robbing the aircraft of pitch authority needed for stall recovery. On the MD-80, the engine nacelle strakes assist in stall recovery out of deep stall situations. If you look at the shorter MD-87, that aircraft’s nacelle strake is even longer- this is because of the shorter moment arm between the tail/engine strakes and the wings. A bigger strake is needed because more force is needed to move the tail in a deep stall event. Not all T-tailed aircraft with rear engines need these strakes, though. The strakes are a product of a series of design compromises to deal with complex aerodynamic interactions. The 727 had no nacelle strakes but some re-engined and hushkitted 727s have them retrofitted. #Avgeek #aviation #aircraft #planeporn #KDFW #DFW #airport #igtexas #planespotting #airlines #megaplane #instaplane #McDonnellDouglas #MD80 #american #dfwavgeek #instagramaviation #N984TW #avgeekschoolofknowledge #avgeekery (at DFW Founders Plaza)

In my recent post about the purpose of the nose strakes on the MD-80, a question came up regarding the purpose of the strakes on the engine nacelles on the MD-80 that you can see here on my photograph of N984TW landing. Those strakes are there for stall recovery- like any T-tailed aircraft, the MD-80 has a series of “fixes” to prevent a deep stall where the stalled wing blanks out the tail in certain flight regimes, robbing the aircraft of pitch authority needed for stall recovery. On the MD-80, the engine nacelle strakes assist in stall recovery out of deep stall situations. If you look at the shorter MD-87, that aircraft’s nacelle strake is even longer- this is because of the shorter moment arm between the tail/engine strakes and the wings. A bigger strake is needed because more force is needed to move the tail in a deep stall event. Not all T-tailed aircraft with rear engines need these strakes, though. The strakes are a product of a series of design compromises to deal with complex aerodynamic interactions. The 727 had no nacelle strakes but some re-engined and hushkitted 727s have them retrofitted. #Avgeek #aviation #aircraft #planeporn #KDFW #DFW #airport #igtexas #planespotting #airlines #megaplane #instaplane #McDonnellDouglas #MD80 #american #dfwavgeek #instagramaviation #N984TW #avgeekschoolofknowledge #avgeekery (at DFW Founders Plaza)

2 days ago
1 note
The nose strakes seen here first appeared on the DC-9 Series 50. It was found during flight testing that in asymmetric flight conditions (one engine out, strong crosswinds) or in high angles if attack, the airflow coming down the long forward fuselage could separate and reduce the effectiveness of the rudder and elevators. The strakes are basically vortex generators that energize the airflow down the length of the forward fuselage to prevent airflow separation. With the MD-80 having an even longer forward fuselage than the Series 50, the strakes were kept. This particular MD-80, N424AA, is the second oldest MD-80 active at American Airlines. #Avgeek #aviation #aircraft #planeporn #KDFW #DFW #airport #igtexas #planespotting #airlines #megaplane #instaplane #McDonnellDouglas #MD80 #american #dfwavgeek #instagramaviation #N424AA #avgeekschoolofknowledge #avgeekery  (at DFW Founders Plaza)

The nose strakes seen here first appeared on the DC-9 Series 50. It was found during flight testing that in asymmetric flight conditions (one engine out, strong crosswinds) or in high angles if attack, the airflow coming down the long forward fuselage could separate and reduce the effectiveness of the rudder and elevators. The strakes are basically vortex generators that energize the airflow down the length of the forward fuselage to prevent airflow separation. With the MD-80 having an even longer forward fuselage than the Series 50, the strakes were kept. This particular MD-80, N424AA, is the second oldest MD-80 active at American Airlines. #Avgeek #aviation #aircraft #planeporn #KDFW #DFW #airport #igtexas #planespotting #airlines #megaplane #instaplane #McDonnellDouglas #MD80 #american #dfwavgeek #instagramaviation #N424AA #avgeekschoolofknowledge #avgeekery (at DFW Founders Plaza)

2 days ago
3 notes
N822NN is seconds from touchdown- delivered in January 2010, this 737-800 is leased from GECAS. The first of almost 250 Boeing 737-800s was delivered to American in 1999; for the first two years, nearly all delivered were owned by American. But starting in 2001, an increasing proportion of delivered 737-800s were leased and now nearly every single new -800 is leased. N830NN, delivered to American in April 2010. Gonna miss these colors. #Avgeek #aviation #aircraft #planeporn #KDFW #DFW #airport #igtexas #planespotting #airlines #boeing #737 #dfwavgeek #instagramaviation #avgeekery #N822NN #avgeekschoolofknowledge #instaspotting (at DFW Founders Plaza)

N822NN is seconds from touchdown- delivered in January 2010, this 737-800 is leased from GECAS. The first of almost 250 Boeing 737-800s was delivered to American in 1999; for the first two years, nearly all delivered were owned by American. But starting in 2001, an increasing proportion of delivered 737-800s were leased and now nearly every single new -800 is leased. N830NN, delivered to American in April 2010. Gonna miss these colors. #Avgeek #aviation #aircraft #planeporn #KDFW #DFW #airport #igtexas #planespotting #airlines #boeing #737 #dfwavgeek #instagramaviation #avgeekery #N822NN #avgeekschoolofknowledge #instaspotting (at DFW Founders Plaza)

5 days ago
16 notes
If there’s no exhaust spike sticking out of the hot section back on the MD-11’s engine, then you’re looking at the Pratt & Whitney PW4000 series engine, the successor to the JT9D. There are three variant families to the PW4000, this is the smallest with a 94-inch fan and is also used on the A300 freighters of UPS. The next size up is the 100-inch fan used on the A330 and the biggest is the 112-inch fan used on the 777. Note the British Airways 747-400 on final approach. #Avgeek #aviation #aircraft #planeporn #kdfw #dfw #airport #planespotting #airlines #ups #mcdonnelldouglas #md11 #instagramaviation #avgeekery #megaplane #instaplane #N284UP #igaviationcontest #avgeekery #avgeekschoolofknowledge #instaspotting #boeing #747 #britishairways  (at DFW Founders Plaza)

If there’s no exhaust spike sticking out of the hot section back on the MD-11’s engine, then you’re looking at the Pratt & Whitney PW4000 series engine, the successor to the JT9D. There are three variant families to the PW4000, this is the smallest with a 94-inch fan and is also used on the A300 freighters of UPS. The next size up is the 100-inch fan used on the A330 and the biggest is the 112-inch fan used on the 777. Note the British Airways 747-400 on final approach. #Avgeek #aviation #aircraft #planeporn #kdfw #dfw #airport #planespotting #airlines #ups #mcdonnelldouglas #md11 #instagramaviation #avgeekery #megaplane #instaplane #N284UP #igaviationcontest #avgeekery #avgeekschoolofknowledge #instaspotting #boeing #747 #britishairways (at DFW Founders Plaza)

1 week ago
13 notes