Hanging off thingy

[maxdrypower]

Guys or gals in this modern age , when you se footage of airliners being flight tested they always seem to have an object trailing on a cable from the top of the fin ,what is that ?

[Genghis the Engineer]

One of these?

http://www.mojaveweblog.com/photos/050919/honeywell-720-N720H-050916-17-8.jpg

It's a trailing static, used as part of the effort to calibrate the aeroplane's pitot-static system.

G

[maxdrypower]

cheers curiosity satisfied ta