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I personally don't understand the materials physics in it

I see. Ok, I was fooled by the fact that my attempts at "chains" all broke away under their own weight. I hadn't thought of adding something at the ends to absorb the initial "twang" of the system settling into place.

So here's, as promissed, my 63m bridge walkthrough:

http://armorgames.com/community/thread/3816188/how-to-create-60-m-bridges-in-cargo-bridge-challenge-mode

Thanks for the walkthrough. I'm particularly impressed by your idea of dropping a single steel support straight downward to add a lower node for compressive load bearing.

Here's another approach based on tensile strength, making use of the fact that two struts connected to the same base point add independant strength...



... so I could go on simply adding as much strength as needed.

I haven't tested as far as 60m, but with three parallel supports as shown I did hang free-swinging extra wooden walkways straight down from all the wooden connection points and it still all stayed up, so the very same design would presumably continue to work for quite a lot further than the pictured span.

(I have to say though, were I the worker I'd've been cowering in my boots before setting foot on half the constructions I've had them walk across.)

Am at 42m, pretty confident i can hit 50 using a similar design before running into any trouble.

Still can't get past level 21 tho, that level is my kryptonite.

This game's got all the engineers at my uni hooked.

Thank you for posting the walkthrough. It has really helped.

I will fix up the link for regenwurm
Here is his 60m Walktrough: [url=http://armorgames.com/community/thread/3816188/how-to-create-60-m-bridges-in-cargo-bridge-challenge-mode]

Sorry didnt work so hetre it is: [url=http://armorgames.com/community/thread/3816188/how-to-create-60-m-bridges-in-cargo-bridge-challenge-mode]

If that didnt work again I think that link is to long to fix it!!!

My bridges collapse everytime i build them!

I use as much wood as possible in my trusses, in order to save weight. I've gotten out to 64m with that method.

I came to the wood realization also. wood is lighter, and more flexible