Plane Answers: Trailing cones, Vegas takeoffs and crew bases
Welcome to Gadling's feature, Plane Answers, where our resident airline pilot, Kent Wien, answers your questions about everything from takeoff to touchdown and beyond. Have a question of your own? Ask away!Richard asks a technical question:
I have seen several photos of what I believe are later model 737s with what appears to be a small drogue chute trailing off the top back of the vertical stabilizer. I have done a few searches on the internet about it but have never found anything explaining what this item is.
I had to check with my friend Tom, who is a Boeing test pilot. He explained that this drogue chute is actually a "Trailing Cone," which is often used in flight testing to accurately sense pressure experienced during various flight test conditions or maneuvers.
The cone stabilizes a plastic tube, which in turn conveys the sensed pressure information to the flight test instrumentation system. The pressure information must be taken at a significant distance away from the aircraft, so as to not have the pressure probe immersed in a disturbed flow field, which can occur if pressures are sensed too near the aircraft.
Usually the cone and tube are "reeled out" after takeoff, and reeled back in before landing. When being used in flight to provide accurate pressure information, the cone and tube are typically trailed behind the aircraft at distances of approximately 100 to 125 feet.
Wes asks:
My pilot on a 737 said on departure from Las Vegas that we were taking off in the opposite direction than normal. He said this was due to the following issues: it was hot and jet engines perform lower in high heat; the runway had a slight incline to it; and the plane was full. I was wondering if these were valid reasons to reverse the departure route on a runway. Thanks.





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When we first started the Plane Answers column at Gadling, the very first question that came in had to do with pilots and divorces.






















