Huntindog wrote:
As for it not adding any strength, see the exerpt from my previous google quote:
Cambering beams allow smaller beams to be used in place of larger beams to support the same load.May 29, 2016.
(that is a very cost effective way of making an RV lighter.)
Yes, allow smaller beams to be used in place of a larger beam so support the same load. Reason: the beam was BENT UP, adding load flattens it to be used with the 'house'. It was BENT DOWN by the load of the house to be flat again. It did NOT make the beam STIFFER. It did NOT (and your article nowhere states it since it is NOT true) reduce the bending. The beam was just crooked to start ("cambered") and then flexed down (bent) by the weight. The amount would have been teh same if they had started with a straight beem, the beam would then flex down by the weight of the house, by the same amount. Quite simple physics (here: stiffness of a beam as calculated by moment of inertial (simple example: rectangle shape beam: https://wesbeam.com/Wesbeam/media/Images/Blog%20images/2019-08-27_14-10-28.png).
