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.
