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Tanking Typhoons

I had the good fortune to be able to spend a day with 101 Sqn of the Royal Air Force when they were undertaking training missions in one of their primary roles of aerial refuelling. Based at RAF Brize Norton, the squadron operates the Airbus Voyager, the A330MRTT aircraft. The aircraft we were in was configured for two-point refuelling while some of the aircraft have a three-point config that allows tanking of heavy aircraft from the higher capacity centreline hose drum unit.

We took off from Brize and headed out over the North Sea. Our initial tracks were off the coast of East Anglia which made for a convenient place to pick up trade from the RAF bases there. The F-35s were deployed from Marham so there was less likelihood of one of those jets showing up, but we did expect Typhoons. It was too long after we were on station before the first customers showed up.

The jets appeared from the port side of the jet and picking them up early allowed you to see them sweeping in astern of the plane before they approached from astern. They would gather off the port wing extending the refuelling probe before being cleared into pre-contact positions on either wing. Then they would pull forward to make contact and take on fuel. Once they were done, they would gather off the starboard wing until the flight had all taken on fuel at which point they would accelerate away to continue with their flight. This departure might just be peeling away but it sometimes included a burst of power and a climb up away from our flight level with the noise even being noticeable inside our insulated cabin.

There are very limited options when it comes to photographing the jets while they are plugged in. The pods are mounted outboard on the wings – I think in the location where the outboard engines would be on an A340 – but the length of the hose means that the drogue is quite a long way aft. This means that only the last few rows of the aircraft – it has a pretty standard seating config throughout most of the fuselage – actually have the ability to see the jets. I had been advised by a friend that the viewing was limited.

I had brought two cameras on the flight. My main camera was fitted with the 100-400 lens and my use for that was on aircraft off to either side. The other body I brought along was an older one I use less frequently these days and that is the M6 with a 55-200 lens. This ended up getting a lot of use. However, neither of them was suitable for use when the jets were refuelling. The angles looking back are tight and the interior panelling around the window apertures limits how you can point backwards. In this case, the phone was by far the best option. The small lens diameter combined with the ability to get it close to the window meant it was the best bet. Even then, it was limited in what it could see.

Later in the mission we headed up towards Scotland to pick up some local trade although, ironically, we ended up with jets from Coningsby which would probably have been fine in our original tracks. Overall, the mission last over 6 hours and we had a variety of periods when we had customers and then periods of waiting. It was definitely an interesting day out and certainly worth seeing. My thanks to the team at Brize for hosting us so well.

Reflection Removing – Choose Settings Wisely

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A previous post had looked at what was, at that time, a development feature in Photoshop that removed reflections from images. Adobe puts development items in Photoshop first to get user experience with them before rolling them out to the software suite. Since Camera Raw and Lightroom’s develop module are basically the same, once it becomes a production item, it also makes it into Lightroom. Such is the case with the reflection removal tool.

I have used it a few times on shots, and it does work pretty well. It isn’t perfect but can be effective. I tried it out on a Typhoon that was refuelling from a Voyager. Shooting through the windows of the Voyager can be a bit tricky and the reflection removal tool can really help. I gave it a go, and the reflection was swiftly taken out. However, when I checked the rest of the image, I saw that a lot of detail in the shot was gone. It was at this point that I realised that the tool has three settings. I was on Preview. I switched to Best and, while the processing took a lot longer, lo and behold the detail was restored.

I have the overall photo above with the before and after versions for a comparison. Beneath I have two crops of the larger image with the Preview and Best settings. I won’t say which is which, but I think it should be pretty obvious. The tool defaults to Preview when you use it so, if you give it a try, don’t be put off if the initial results are disappointing. Make sure to experiment with the settings.

Typhoon Air Data System

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Working through some older shots for another project, I ended up looking at some shots of an RAF Typhoon displaying. As I was zoomed in on some of the shots, it was interesting to see the air data vanes on the underside of the front fuselage as the plane maneuvered. There are several vanes around the underside of the front fuselage and the differences between them can tell yaw and pitch angles. In one shot when the jet was climbing straight up, the vanes are all pointing in similar directions. Shortly before this, as the jet was pulling hard, the angle of attack was higher and the flow up around the front fuselage results in some significant differences in vane angle.

This is the sort of thing that is very important when designing and clearing a flight control system. We had a front fuselage wind tunnel model for the Typhoon during the development program. This was used for intake design but also for air data system modeling. The way in which the various vanes move is vital to understanding the control law requirements. It is also important when considering failure modes. If one vane should fail, how much it impacts the flight control behavior and how much the system detect the failure. Will the aircraft be vulnerable to control loss in the interim? The Tornado did not have as complex a flight control system, but it did have augmentation of the controls and, as it rolled, you would get quite different readings from the angle of attack probes on each side of the fuselage. How much of a difference was normal versus what was a failure was an interesting analysis problem which I enjoyed working on. My days on Typhoon were relatively limited and shortly before first flight so I never got involved with the results of the testing program, but I do enjoy looking at the resulting aircraft whenever I get the chance.

Back to My Roots with the Typhoons

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The Brits were at Red Flag in numbers too for 16-1. An E-3D Sentry was part of the AWACS fleet while a C-130J Hercules launched each day I was there. Judging by the dust and dirt on the underside, they were landing on rough strips out on the ranges during their missions. However, the thing I was most looking forward to seeing was the Typhoon. The RAF brought eight jets from 3 and 11 Squadrons. Most days six of them launched.

In my youth, I worked on what was to become the Typhoon in my BAE days. I was an aerodynamicist looking at airframe loading and the possible flight envelope for the first flight. I was not looking forward to the job when I was given it but working on loads turned out to be a great task and taught me a lot about structural limits, flight controls and the process for expanding the flight envelope. A mentor of mine had told me it sounded dull but was very valuable and he was spot on. I guess he is a smart guy because he has gone on to be rather successful in the company!

Back on topic, the Typhoon is something I am very pleased to have worked on. Getting to see them in action is great. The launches when we were out by the runways were great. When we were by the EOR, we were directly across from the ramp that the Typhoons were using so I managed to see them crewing up for the launch. Then, of course, they had to come right by us as they taxied out. I know it was a long time ago but I can’t help but still have a soft spot for them when I see them in use.