How do I choose a spring for a spring mount subframe?

sychau

New member
Hello Everybody!

I'm bulding a camper truck, the truck is a renault 110/150, it was a fire fighting truck. and I'm fiting on it a old army shelter.
After many hesitation I choose to fit my shelter on my truck with a subframe and a spring mount system.

If the length of the springs is quite easy to choose, I can't find anywhere how to calculate the return force of the springs. it's depending of the weight of the charge I presume. Does anyone have a idea?

(sorry if my english is not allways perfect, it's not my mother language...)
 

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