Thread:SlyCooperFan1/@comment-5218545-20160518145026

I went and looked through all the parts and I can confirm that for each of them, judging by the parameter gauges, the boost for Lightweght parts seems to be between S and M parts in terms of strength. The only exception is the Lightweight Fire Extinguisher, which seems to have the same boost (and Cst) as the S one. This needs testing.

Moreover, the ACEINF aircraft assembler shows that at least for pure damage+ parts the bonus seems to have a flat increase across all the part sizes, namely the Advanced Warheads grant 70 dmg for the S version, 140 for Lightweigh, 210 for M and 280 for L.

I'm also not sure with the wording, currently, it says that each "larger" part is more effective than the last, suggesting than Lightweight is larger than S, even though it consumes less slots.

One more thing to add is that for parts that grant not only stat increases, but also decreases (high precision seeker for example), the decrease is also more severe in higher tier parts. 