When Boeing launched the 777-300ER, they took the stretched fuselage of the 777-300, a model that didn’t sell particularly well and married it to the updated wing that made use of the fuel capacity of the outboard portion of the wing that had been left when the original concept of a folding wing was contemplated. The increased the weights of the jet, added far more powerful engines and, with the increased fuel capacity, came up with a winning formula that has done a very effective job of killing off the 747.
One problem that they had to deal with during development was runway length requirements for takeoff. Even with the bigger engines, the long fuselage limited rotation angles at takeoff and meant a higher takeoff speed was required which meant a longer runway requirement. Boeing came up with an interesting solution (after dumping some slightly more curious ideas). The main gear on the 777 has a triple axle bogie. Previously this had rotated about the pin attaching it to the main gear leg. Boeing’s solution was to lock the bogie level during takeoff.
The result of this is to have the rotation of the jet at takeoff to take place around the rear wheels of the bogie rather than the gear leg pin. The slight aft movement of the rotation point allows the aircraft to rotate slightly more nose up and gain a greater angle of attack. This gives slightly more lift for a given speed. This means an earlier takeoff and a shorter runway requirement.
I have tried many times to witness this at work. First, it happens pretty quickly. Second, I am often in a poor position to see the rotation point. Recently I was at SFO to pick up some people. I was getting a few shots prior to their flight arriving and a Singapore 777-300ER was taking off. The rotation point is quite far away (although, if you are in the terminal, you might have a good view) and the heat haze is a problem. However, I decided to get a sequence of shots anyway. Now, how to use them.
Heat haze is crappy on stills but less of an issue with moving images so I decided to animate the sequence. I imported all of the shots into Photoshop as layers in a single document via Lightroom. The hardest part was aligning them. I started at the bottom layer and then progressively made each layer above visible. I then changed the latest top layer blend mode to difference. This makes aligning them a lot easier since everything is black unless it is different. I was focused on the gear so used that as the reference as the fuselage rotated. Once each layer was in place, I changed the blend mode back to normal and moved to the next layer up.
Once they were all aligned, I used the animation timeline to make frames from each layer (and reversed the order since every time I do this they seem to be the wrong way around). Then I could crop in to get the overall view I was after and save the file. A Save for Web allows the generation of the animated GIF and we are done. The image at the top is the final result. It does allow you to see a bit of what is going on if you look closely although it is still a bit hard given the distance, the angle to the ground and the heat haze. I guess I will have to find a location closer next time.
Half Moon Bay on the Pacific coast hosts a great little event each year called Dream Machines. It is a combination of an aircraft and car event. I took a trip with my buddy Hayman to see how it was this year. The weather did not start out favorably and it looked like it might be a bit of a dull day. The clouds early certainly stopped a few visitors from making it in. However, the weather got a lot better as the day went on and there were still lots of great things to see.
Dream Machines is not an airshow so there are no displays. However, some aircraft get airborne and might do a few flybys. I covered the event for Global Aviation Resource and you can read my coverage in more detail at http://www.globalaviationresource.com/v2/2014/05/05/aviation-event-review-dream-machines-half-moon-bay/. There are a couple of sad notes associated with this day. The Sanders owned Sea Fury, Dreadnought, was at the event and departed in mid-afternoon. It was closely followed by a Cessna support plane. Unfortunately, en route to their base, they collided over the water and the Cessna was lost along with its pilot. Dreadnought suffered damage but returned to base. Also, as it was his home base, Eddie Andreini was part of the day’s proceedings including flying his Mustang. On the static line was his Stearman and this was the aircraft he was flying at Travis a few weeks later when he crashed on the runway and died. Both losses are very sad and our thoughts are with the friends and families and all involved.
