I’ve thought about this before, but sometimes it takes a few years to ask about it. I saw some builds using 4 of the Flamingo legs. Now, those legs draw 40% cabin power. I’m assuming each individual leg is drawing 40%, for a total of 160%. How the heck does the thing move, let alone be able to fire and reload weaponry? Does the cabin-power parameter really have any bearing in the game, or is it just a novelty specification?
I think it affects acceleration. Someone made a build with 350% cabin power once and it reached top speed instantly.
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WALL OF TEXT INCOMING!!!
Main formula:
I thought it was taking the power of the cabin plus the little engine power, then multiply that by 100% minus the power penalty, and then multiply that new percent by the cabin and engine power. However there is an issue with this formula IDK how to fix.
Example 1 (works like it should):
So if a cabin starts with let’s say 100% power, and each movement part is 10% power decrease, with no engine for this example (to make it simpler). we can do 100% (cabin power) multiply by 90% (which is 100% minus the 10% from the movement part), and we get 90% for one part. Then we take that and multiply by another 90% for the next movement part. Now we have 81% (because 90%*90%=81%) of the original power after adding 2 movement parts. For the third movement part we get 81%*90% which is 72.9%. Fourth part is 72.9%*90% which is 65.61%. and so on.
Example 2 (still no issues):
Now lets say the cabin still has 100% power, but there’s an engine with 15% power boost, and each movement part is 13% power penalty. Now we take 100% minus 13% (from the movement part) and we get 87%. Also: 100% from cabin plus 15% from engine equals 115% power. Now we take 115% times 87%. This would be 100.05% after adding one movement part. If we add a second movement part, we have to do 100.05% times 87% to get 87.0435%. Third part is 75.727845%, and fourth is 65.88322515% if we still multiply by 87%.
Example3 (the issue with my theory):
Let’s say the cabin still has 100% power, but now we have 2 movement parts, one with 8% power penalty, and the other with 12%. There is no engine. 100% minus 8% is 92%, and for the other part 100% minus 12% is 88%. For this example we want 2 of each movement part. 100% times 92% is 92%, times 92% again is 84.64%. 84.64% times 88% is 76.2432% and multiply by 88% again for the final part is 67.094016%. HOWEVER if we do the same math with the two 88% movement parts first, then the 92% ones after, using the same formula, we get 65.545216%, which is not the same. IDK what the formula is for multiple movement part types with varying power penalties. 
If you read this, thank you, it took a while to type and math, if you didn’t I understand. 
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Power penalties and bonuses are simply multiplicative, no need to overthink this.
Here’s the problem:
That was incorrect - 0.8464 * 0.88 is 0.744832
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wow this is a thread
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ah that makes sense, thank you!!
soooooooooo wut?
sooo the math DOES add up when you correct the mistake I made in the calculations (thank you @PanPsychol), and I was explaining how and why it works with examples. 
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