For mechas in the 30-50 Ton range here is this handy little niode engine part. It costs 1,050 Ferrite, 1,050 Bioptics, and 19 Niodes to purchase. It has Auto Repair of 1, Speed of +5, Projectile Vulnerable at 10%, and Laser Vulnerable at 4%.
Now those two vulnerabilities aren't really an issue with proper slots and shielding to put them in. The Auto Repair isn't bad, minimal but at least it's there. The Speed isn't bad, there are bigger, faster and more powerful engines out there yes, but use these right and with the right mecha sporting a proper load out for the rest of your equipment and you could be very satisfied with the end results.
Submitted by Pat Willis#224534