Know the feeling! Some years ago, living and flying in Fiji.
Was flying at 7500 ft in an islander, luckily was a ferry flight only myself on board. Flying through a TS, went up, and up and up. Finally It stopped, at 18,000ft!!!
My advice to anyone out there, esp young guys dont get in an aeroplane with just anyone! I wont get into an a/c without a set of controls in front of me!
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The only time you have too much fuel is when you are on fire!!