What do you get when you combine a Rolls Royce engine with parts from a TCM
and Superior engine? In one case, a Sabrina O-200A:

http://sabrina.aero/

Follow the link to the four YouTube videos for more of the story. Seems to
be an impressive accomplishment for a 14 year old.

My guess is that Sabrina Spacecraft Manufacturing will have interplanetary
spaceships available in a decade or two.