For the people that don’t care for my aviation posts, this one won’t be of interest. For the aviation fans that don’t care about the techie stuff, this will also be of limited interest. That probably leaves a very small group of readers by now (Gary, I am trusting you are still here). This is about a piece of flight test instrumentation that often causes questions when people see it. It is the trailing static cone.
The aircraft has sensors that measure air data, two of the most important of which are the pitot probe and the static port. The pitot probe measures the dynamic pressure of the air which increases as the speed increases. The static port measures the air around the aircraft. The difference between the two is used to determine the speed of the aircraft and the static is used to determine the altitude. These are both vital information for a pilot. However, the aircraft affects the flow of the air around it so, while you can calculate what the pressures should be, you need to validate what the actual readings are. The first flights are carried out prior to calibrating the system so you need to have a bit of margin in the speeds you use until you have confidence in the readings.
Measuring static pressure is hard to do. The plane will have a static port on the skin of the plane as well as possibly incorporated with the pitot head. However, the air has accelerated to go around the fuselage so it is assumed to have a lower pressure than ambient. Because the plane is disturbing the flow, you need a way to measure the pressure some distance away from the plane. The answer is a trailing static cone.
This cone incorporates pressure measurement sensors and it attached to a long cable. This is held on a reel inside the aircraft and fed out of the aircraft at the rear. For airliners, this is usually through a modification to the top of the fin. A comparison between the test aircraft and a production jet will show the different structure. The cable dangles out of the fin and, as the speed increases, the cone pulls the cable taught and streams backwards.
When the testing is required, the cable is winched out and the cone is a long way behind the aircraft in what is relatively undisturbed airflow. If you go to the Museum of Flight, the prototype 747 is on display and it includes the trailing cone equipment in the fuselage. The reel is shown in its mounting location and the trailing cone is hung inside to allow you to take a look at it.
There are a lot of air shows that I have been to over the years. You think you remember them well and then something shows up in your archive of images that you have completely forgotten about. I am a member of a Facebook group that has a different challenge each week and, when I get the next challenge, I work through my catalog to see what I have that might contribute. It is an interesting exercise in finding stuff that I had forgotten about.
This wasn’t one of those challenges but I was looking for something else when I came across this shot of an F-22 pulling vapor and shockwaves as it did a fast pass at the Rockford Air Show. Rockford was a great show that I used to go to when I lived in Chicago. They always got great static displays and performers for the flying display. The only limitation was that you were pretty much shooting in to the sun.
This F-22 made a fast pass and was clearly pulling a lot of vapor as it went. I don’t know why I forgot about this sequence but apparently I did. I had a go at processing them again to see what I could make of the shots this time compared to my technique in 2009. Not an easy shot to make work but the plane is dramatic enough to make it worthwhile I think.
