measuring drag in flight
I am plodding through a aeronautical engineering self education process through access to a technical library. Being a pilot Im starting from a low base.Im hoping someone here can advise me.
I have seen many mathmatical calculations of drag in cruise flight but is there a way to actually measure it in test flying?
Perhaps sensors in the hub of a test propeller or something of the sort?
I have seen pictures of early German jet and rocket aircraft being towed for test purposes. Did they measure the tension in the tow line?