Hi there guys!!
Apparently some guy fitted a 737 apu to a jabiru!! It had vertical climb capability, and a 25000 ft ceiling. Due to the fact it cruises at such a height it can maintain 150kt indicated which equates to a 250 kt TAS (Ididnt check it on my wizz wheel). So considering it can fly at the height of a jetstream (which for the definition, has to be at least 60kts in magnitude, u can get a 300kt ground speed out of it. Because it has beta mode if one was game, u can descend vertically. The hurdle will be getting it IFR certified.
And keeping the wings on???
Woomera