chin "spoiler" question
 

I finally have some good materials for making a chin spoiler.
But, looking around, a LOT of suv's and trucks have differing methods of implementation.
Some have a simple one that goes straight across, ahead of the engine and such.
Others, have a curved one that goes round to the wheels, kinda like tire spats.

What would be more effective?
Is it WORTH trying to make the curve of the bumper vs. just getting a couple of screws and tying it in to the radiator support?

The one on the radiator support would be able to be lower as well... dunno if that matters, but for ground clearance on the truck, if i put it on the front would be more like a 3" drop, which WOULD put it about at the bottom of everything else under the truck. The radiator "flat" design would be able to go more like 4-5" down, and be past the pan if needed.

i'm not sure what you could do as far as a chin spoiler (from pictures i can find online. Do you have any pictures of your truck showing the front end from different angles?). i would say it might be easiest to do a wrap around air dam to attach right below the chrome trim on the upper part of the front bumper.

At the bottom of the plastic part of the bumper, there is a 1/2" lip going straight down, and going from one end by the wheel all the way around to the other. I would follow this contour, which looked fairly decent, and find some black screws to screw it together. I would probably taper it slightly on the sides as well, to meet with the tapered corner.

http://image.trucktrend.com/f/roadte...t_tow_view.jpg
sorry, that's the best pic i could find quickly, and it's also a good representation of what i'll be doing this summer.... wanna talk aerodynamics of THAT baby?

OH, and note how the suspension is CLEARLY much lower than the front bumper.

checkout my album and what i'm doing with my jeep. (it may be what you're talking about doing, as i am writing this while that page loads)

Yeah, from your pics, I believe we are talking about something pretty similar!

it should work relatively well, for me it will force more air into the chin opening for cooling (marginally speaking due to increase in pressure) and the slight curve will push the air out to the side. having a wrap around air dam would push more air over your truck rather than to the side, but i'm not sure what difference that would make.

Support will the be the key on how much movement/deflection you will git. I've found that a single sheet of Coroplast will flex too much and will eventually buckle when at speed (65mph or so). I don't know how much air it takes to bend it...but I guess it will also depend on the length of the support.

Here's what the new NASCAR Sprint cup splitter support system looks like...
http://www.youtube.com/watch?v=HBcyg...eature=related

Well, I won't be using coroplast, I'm using a roofing material that is fairly beefy and is pretty stiff. I may back it up with someting, but i'm fairly sure the curve is going to give it some good strength as well.

Also, Frank Lee, ty for the link... I HAVE read that, but this was a specific question as to the better design - curved with bumper, OR, the straight down and across design implemented in many trucks/suv's today.

straight or curved
 

I would wrap it around all the way to the front tires.A flexible chin will allow hyper-SAE angles.Big Dave uses rubber conveyor belt material.I've had some success with plastic lawn edging and foam rubber floor cushion.