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Anyway thanks all for the ideas & suggestions but I'm trying to get an idea of my cost and effort for reward ratio. Is there a site to help me compare different modifications and what the energy savings would be? I'm sure I could spend $10G making it look like a rocket but I'm not going to do that. Im trying to find that sweet spot in the ratio (effort<=reward) and what to expect.
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That would be Ecomodder.
It's all anecdotal, because each owner and use case is different, but there are accepted principles based on both hearsay and evidence.
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Question: If I have a square meter box, what is the aerodynamic reduction of force required to push that through air at 60mph if I instead it had a 45 degree leading edge? Is this an applicable question for the front box of the truck?
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Every element has a Cd. Those are both summed and interactive.
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If that greenshield thing works, maybe I could mimic the idea and use it to hide my spare up there. Reasonable?
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It needs to be moved forward over the cab to maximize the length of roof behind it.
Davits for storing and retrieving the spare? That's the style with [the decidedly unaerodynamic] Dekotora trucks. They started out as a place to store tire chains, etc. Colani's trucks use a tilted oblate spheroid:
https://en.wikipedia.org/wiki/Luigi_Colani
Here is a sketch I did for
another thread, some of it might transfer to your case. Half-round front corners and a deflector ring at the rear.
Rear-view mirrors are also impotant.
I just discovered the archive view of the Aerodynamics sub-forum. Scan this list for item of interest:
https://ecomodder.com/forum/archive/f-6.html
Here's a list of relevant threads
from here.
https://ecomodder.com/forum/showthre...uck-34674.html