Quote:
Originally Posted by craveman85
Quick truck belly pan question. Let's say you were to build a 2/3 belly pan back to your rear axle. Things get tricky back by the axle though. How good would it work to make a v shaped air dam to kinda plow the remaining air sideways out from under the truck so it doesn't hit the axle. Or would it just be better to stop just in front of it.
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According to Carr's research,I think it was reported by Scibor-Rylski,if you have 2/3rds of a pan (the forward portion),then you'll have most of the pans benefit,excepting that you lose the chance for a diffuser which can really enhance a pans performance.
As for the the axle,I've done what freebeard recommends,just leaving a slot in which the axle can move vertically.Most of the air will just 'jump' the gap.(a fairing could be constructed for attachment to the axle bottom such that at neutral 'trim',would seal the gap).
A V-shaped cattle-catcher airdam would add frontal area,trigger separation,increasing the wake area,would itself be a high drag structure, blocking the path of energetic air which might be converted to pressure for the wake,and create transverse jets,out both sides of the underside which would play havoc with the free stream out there.