On 15/06/2015 11:36, GM wrote:

I can do that in my glider, though not for quite as long...

Yes you can! Do a winch launch on one of those specially modified
European winches that use over 11,000ft of line, hold that climb for
2 minutes and end up at over 4,500ft. I bet the jet cannot do that!
Uli


What - 2250fpm? Most modern twinjets do that easily. A full thrust
takeoff in an empty 747SP cracks 4000fpm. Even if you allow 30 seconds
for the takeoff roll - about right at light weights - 4500 feet two
minutes after brake release would be easy.

OTOH, I'm stunned at the lack of scepticism about the video. The climb
will be nowhere near vertical. 150kts indicated is 15000fpm if
vertical. It's nowhere near that. The climb is likely about 5000fpm -
50kts in glider-speak. That's about 30 deg climb angle. Perspective
foreshortening due to long focal length lenses is a wonderful thing.
That's how all those aeroplanes survive 60 deg drift landings in HKG on
those Youtube videos.

GC