Pion Engines

These engines appear in the Star Frontiersman Issue 7-p26.
Additional information is as follows;

Pion engines need to be overhauled same as atomics, as per the following schedule: 

A: 1 overhaul/7 jumps 
B: 1 overhaul/10 jumps 
C: 1 overhaul/15 jumps 

These engines require a pion engine computer program which costs double the atomic engine program.