Random Belly Pan Thread

[kach22i]

There are "how-to's", "project", and "material" threads on this topic of Belly Pans, however if someone just wants to see a bunch of examples of how different conditions were addressed in a pictorial or encyclopedia type of way, then perhaps this thread may help them.

One of the more recent examples I saw was of a corrugated (plastic of metal) with a screened portion in the middle for the exhaust system, caption said it was never installed, I will try and find that one later. It was the picture which got me thinking to put these images all in one place as a reference of the good, the brilliant, the simple, and the beautiful. Welcomed are also images of the bad, and the ugly. We have as much to learn form our failures as our successes.

EDIT: Found it.
http://ecomodder.com/forum/showthrea...ild-30320.html

Originally Posted by Gasoline Fumes

Here's what I came up with. Not installed because I never decided how to mount it in a way that's easy to remove for service.

For now I found a curious example to start out with, very specialized, an under-tray for an air-cooled Porsche 911. On this power-plant air is drawn in from a grille in the rear lid above the engine with a axial fan and directed down over the cylinder cooling fins (which look like a motorcycle's engine) via a fiberglass shroud/cap/duct. The air exits out the bottom which I imagine caused quite a ground plane disturbance. To restrict airflow on these engines in any way would be disastrous, especially while engaged in the strain of motor-sports racing. Therefore I'm still trying to figure this one out, not sure if it's good or bad yet. I do know others have done it, and some with ground effect fins.


Show me your rear end - Page 4 - Pelican Parts Technical BBS


On closer examination I see mud flaps and a high ground clearance, an indication that the function of this car may be as an off-road or road-rally racer. In which case this is a shield to protect the engine from shot-gun like blast of road gravel and debris from damaging the exposed engine. Perhaps more akin to oil-pan covers of front engine off-road 4x4's than aerodynamic sleekness seekers.

The more examples the better, no matter what the intent is, at least that's my attitude about the pictures to be posted.

[kach22i]

A few posted in the forum before.

http://ecomodder.com/forum/showthrea...ail-26258.html



http://ecomodder.com/forum/showthrea...-18508-44.html

[kach22i]

I did a Google search (not a forum search) for "belly pan ecomodder" hoping to find a few more forum examples and I found this Wikipedia link as the first entry posting.

Belly pan - EcoModder

About EcoModder

This quote above is in the form of a link at the bottom of the page. It leads to an "ABOUT" section describing the do's and don't of ecomodding.

Here are some of the images hotlinked from that first link.





FYI; to who ever created that page, the top picture says "No higher resolution available.", meaning that side view remains a thumbnail size.

A direct link to that actual project on ecomodder might be nice too.

[kach22i]

2008
Password JDM underbody aerodynamic package
Password JDM underbody aerodynamic package - S2KI Honda S2000 Forums


From page 2:

Their CF Engineer built racecars for NASCAR, Team Penske, racing legend Dan Gurney and various race teams.

Also, the designer, knows his !@#$ about aerodynamics. He designed the CF underbody of his 2005 black Gallardo, he contracts alot of his design ideas as well to consultant Boeing Aerospace engineers and he probably is the only tuner with two autoclave in his warehouse.

Password:JDM Dry Carbon Fiber Complete Bottom Diffuser Package (AP S2000) | Password JDM

Strategically placed cooling scoops and NACA duct for adequate cooling of components

I still don't see how the CF doesn't melt off from the exhaust heat.


Password JDM underbody aerodynamic package - S2KI Honda S2000 Forums - Page 3

They certainly have a different concept than ASM. ASM runs vertical fits on the side diffusers to channel air back and leaves the center part open for cooling. They also run a diff and oil cooler with the front and rear diffusers.

Shielding
Password JDM underbody aerodynamic package - S2KI Honda S2000 Forums - Page 5


From what I've read this is a "dry carbon" panel.

This is what I found on that term (from another site - unrelated):

Carbon Fiber 101 – Wet vs. Dry | GruppeM North America

The manufacturing process to achieve an ideal dry carbon fiber performance product requires the carbon fiber weave to be “preimpregnated” with the ideal amount of graphite epoxy prior to the molding and curing processes. This differs from the wet carbon fiber process in which the epoxy is applied to the weave continually until the appropriate amount of surface area coverage and thickness is achieved to meet the strength and consistency requirements of the product design. The resulting product is so much lighter than wet carbon fiber because there is absolutely no excess epoxy, which accounts for the “dry” appearance of the finished dry carbon fiber component.

HDT Heat Deformation Temperature
Terms and Definitions of Composite materials used in Boatbuilding Mainly Carbon fiber Kevlar and Fiberglass.

High temperature epoxy can go as high as 300 or slightly more in dry conditions and 250 in wet conditions as long as it has had a post cure cycle.

Okay, I see how maybe that belly pan contends with the heat if using a combination of reflective metal heat shielding, dry CF (less epoxy) and use of high temperature epoxy.

I've just never seen this done before.

Seems out of reach technology wise for the backyard tinkerer.