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Would you kindly provide a picture as an example? I'm having difficulty visualizing this type of diffuser.
Google images for coroplast diffuser, coroplast undertray, coroplast belly pan, etc. and click on the pics for further information. Ecomodder.com aerodynamics forum has scads of posts on this, as well as efficiency measurements of before and after fuel economy, and methods of attachment. Zip ties work well. Also look at what Ecomodders has done with pizza pan wheel covers, to smooth air flow. I'm not suggesting pizza pan wheel covers on a Porsche, but such aero research very strongly suggests using Porsche sewer lid or Design 90 wheels. I use D90 wheels because they are virtually as light as Fuchs, probably stronger, WAY more streamlined, but at a fraction the cost. Not bad looking, either.
Google images for, say, "Ferarri diffuser" and note the upswept angle of the rear diffuser, the flow fences, etc. This could easily be made of Coroplast. The air flowing from under the car is faired gently upward under the rear bumper, filling in the turbulent wake, and giving some negative lift, i.e., downforce into the bargain.
Election day is next Tuesday, so 4x8 Coroplast political signs will be taken down soon. Get a couple, preferably ~1/2" or so thickness. This may be the ONLY contribution most politicians will ever make to improving your life... Besides, you'd be doing a public service by removing roadside eyesores.
If you don't like the politician, remove the writing with a rag wet with acetone or paint thinner. Nobody will notice your new belly pan hidden under your car, so you won't get snarky comments from Porsche purists.
Also, ask your local library to borrow a copy of Hucho's book on auto aerodynamics. Inter-library loan from, say, a college engineering library, will cost you nothing to borrow for a few weeks, study, make copies of relevant sections, etc.
In the 1930s the Germans were decades ahead of everybody else. No car yet has come remotely close to the 1938 Schoerwagen pill bug in aerodynamic efficiency.
Yes, just when most people thought minimising air underneath is the way forward this design is reverse, virtually a catamaran style which I wonder had any influence with Newey's work on speed boats?
Just Look at the ride height ! which will be reduced with all the aero downforce at speed but's it's vey high by supercar standards...
QUESTION: Side skirts, do they help with cross winds or hinder?
From how I understand them they're more of a package in adding to a car's ground effect and to clean up air down the side of the car, also eliminating turbulence or disruption to get under the car.
From how I understand them they're more of a package in adding to a car's ground effect and to clean up air down the side of the car, also eliminating turbulence or disruption to get under the car.
The ground effect that F1 and others designed in regard to side skirts was to seal what air went underneath and stop it spilling out the sides...
Getting back to Aero, Look at these Gorgeous Mirrors on the new (Mid Engined) 911 RSR
The ground effect that F1 and others designed in regard to side skirts was to seal what air went underneath and stop it spilling out the sides...
I'm not saying you're wrong, I've actually read things saying just that too. I'm no aerodynamicist and it might not be directly from Murray or Newey but here's what I've read previously:
"Side skirts are used to reduce the amount of high pressure area on the side of the car to go under the car from the sides. If an air splitter is used, air under the car is at a low pressure, which causes the higher-pressure air on the outside and on the sides of the car to come rushing in diminishing ground effect and downforce."
Anyone knows what the drag coefficient was for the 924S OE Bodykit ? I have managed to find and have two complete sets in guards red ( same as my 924S) and thinking of putting one one, just the idea of drilling 24 holes i dont like much but if i do install it i will do it at Porsche. Wonder if this kit makes a noticeable difference ....
11-02-2016, 04:18 PM
