That engine is just 5 units above the stock engine for a JM6-DD.
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I've unmothballed the Rifle C. We'll see how it goes since I will also be getting some footage for it. Honestly the stock AC/10s weren't all that bad of an idea even if you needed to be a little closer to really benefit.
This is the personal rig that I have conceptualized based on how I play. There's a number of merits to this setup. As you might notice, it lacks an engine. Why is this a merit? Think about it. I designed what I wanted before worrying about how to power it. This tells me the amount of tonnage that I have left over after armor, weapons and equipment. It was originally 15 tons, but I squeezed an extra .5 to have an additional option.
Now, I could go with a 15 ton XL 290 engine. I will be fragile, but my speeds will be up to 78 kph without delving into the mobility tree and even faster if I do. Such speed would be ideal for relocating after being discovered or when threats too large for me to handle start coming my way. It will also allow me to climb steeper hills due to the higher speed which in turn gives me more torque when 'twisting' left and right to get more footing.
Or I could go with an LF 250 engine, capitalizing on a balance between speed and survivability. A speed of 67.5 kph without touching the mobility tree, not quite that of a 260 but certainly better than stock, still.
The choice in weapons was also done with a degree of flexibility in mind. For example I can swap to 4 Medium Lasers by switching to Ultra/5s, Or I could climb up to LB-10x by sacrificing the Light Machine Guns, or to AC/10s by dropping the LMGs and the ER SLs. I could use the same method to get 2 Light Gauss Rifles. Or I could drop the ACs altogether, sport 4 LMGs instead and change the lasers to twin PPCs + additional heatsinks or shove in 4 Light PPCs and fire them in sets of two (or 4 in emergencies).
There's a lot of options.
There's actually quite a few at stock, too, for example with the std 240, endo and double, change the AC/10s for twin Light Gauss, replace the ammo accordingly, stuff in 2 DHS and trade the 2 ML for 4 ER ML (or just 2 ER ML + more armor).
This rig strikes me as interesting, the STD 260 engine, 4 LMGs for emergencies (400 meters or less, spray away; best at 250 meters or less). Twin Heavy PPCs for a hefty though hot punch, each mounted on either side of the cockpit. 15 damage per HPPC. There's your big punch. The heat lets you know that you need to relocate after a couple of shots. Get a heat warning, take that as your queue to find another location to shoot from. Rinse and repeat.
Just remember no matter what, if you need to run away, never give your back. Learn to pilot backwards by using the minimap to help you navigate. This way you can shoot and fallback at the same time.