“Horizontal timber beam reducing deflection by repositioning columns or resting points.”
Reducing distance between resting points helps to minimize deflection range.
To compare the diferece of deflection.
As per the video, resting points on the far ends, Cedar beam size 100mm x 100m x 4.6m long with slotted in T section aluminum 3mm x 70mm x70mm.
The second video shows resistance to deflection minimized by reducing the distance between resting points.
Good luck with your Carpentry Project.