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  #271  
Old 01-29-2020, 01:44 AM
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Thanks, guys! Working on, disassembling and modifying these types of cars has really helped with the design and engineering of my Vette and other classics cars/ hot rods that we build here. Itís a great learning experience and keeps us up to date with new materials, techniques, etc...

The jet ground plane is interesting. I wonder if that phenomenon is the intention of those downward vents? They arenít just on these performance cars, Iíve noticed them on a lot of other cars in here too.

Another trend Iíve noticed is that only Toyota/Lexus takes advantage of vortex generators. They are all over their cars. Multiple on the taillights, and very often on the side view mirrors (to prevent wind buffeting with the window open I assume). Havenít noticed them on Teslaís or other hyper mileage type cars...
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  #272  
Old 01-29-2020, 02:39 AM
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Took a bit to find the search term, but this works: jet ground plane in cross flow.

Very Interesting - and I'd bet that image is for a "Hover" jet? Any link for a jet that has forward motion? I recall from designing a hovercraft (Uni-days) that the tough problem we faced was sustaining the jet underneath while moving at speed. To keep the air bubble underneath the hovercraft (including skirts et al) we needed to have a lot of air to support at speed - more than at rest.

Clearly what we'd want here is to provide is negative lift under the chassis - to make downforce and this might be a way move the air out from underneath. The pics Chris shared show some interesting ways to do that. Thanks!

This seems to be an area to work with out a lot of external "stuff" - splitters skirts, wings, etc. (but they look so cool).

Cheers - Jim
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  #273  
Old 01-29-2020, 05:33 PM
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It is for jet in hover with crossflow. You can see they drew the crossflow velocity with the boundary layer type profile ( zero at the ground). Not exactly the same as the car, but analogous. Also, velocity ratio for the car will probably be closer to 1.

But, they made them (extra cost) so there must be a benefit, like forcing air to go around the tire. Just guessing.
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  #274  
Old 02-01-2020, 04:04 AM
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Make new rocker moldings out of thin aluminum which are 1 to 2 inches longer. This will act as side skirts keeping flow out from underneath. Lower is always better for side skirts.

Creative use of black paint could disguise how low they are.

Also, the spare tire area is a mess, a diffuser would be too obvious for your goal, at least a smooth under belly would help.
We're on similar wavelengths here. Several years ago I pulled the stock rocker panels off and made 2" lower/wider replacements with Lexan sheet, and painted them semi-gloss black. I like the looks better, and so far no one has seemed to notice the change.

I had an aluminum bellypan on the car for a year or two, but my unscientific perception of the setup convinced me that the weight (about 30#) was hurting me more than any actual aero improvement was helping.

I've also looked into doing something at the rear, but so far I can't justify the weight of a diffuser. My current direction is to reduce the slight understeer I have, and ignore the rear until it becomes the limiting factor during cornering.

Are you running a rear sway bar?
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  #275  
Old 02-03-2020, 07:37 PM
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Originally Posted by rtj View Post
Make new rocker moldings out of thin aluminum which are 1 to 2 inches longer. This will act as side skirts keeping flow out from underneath. Lower is always better for side skirts.

Creative use of black paint could disguise how low they are.

Also, the spare tire area is a mess, a diffuser would be too obvious for your goal, at least a smooth under belly would help.
We're on similar wavelengths here. Several years ago I pulled the stock rocker panels off and made 2" lower/wider replacements with Lexan sheet, and painted them semi-gloss black. I like the looks better, and so far no one has seemed to notice the change.

I had an aluminum bellypan on the car for a year or two, but my unscientific perception of the setup convinced me that the weight (about 30#) was hurting me more than any actual aero improvement was helping.

I've also looked into doing something at the rear, but so far I can't justify the weight of a diffuser. My current direction is to reduce the slight understeer I have, and ignore the rear until it becomes the limiting factor during cornering.

Are you running a rear sway bar?
No. I'm running the '84 Z51 rear spring, so I've got plenty of rear roll stiffness. I've been focusing my efforts at changing the front suspension geometry to improve the front grip.
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  #276  
Old 02-06-2020, 12:01 AM
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6 yrs old.

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  #277  
Old 02-06-2020, 12:16 AM
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  #278  
Old 02-16-2020, 01:41 PM
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RTJ
This has nothing to do with what your talking about, but
Have you put the body back on your chassis? I did the trailing arm adjusters that eliminates the shims and now the that it’s done I’m wondering if the body is going to fit?
Do you know if it does?
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  #279  
Old 02-16-2020, 07:49 PM
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RTJ
This has nothing to do with what your talking about, but
Have you put the body back on your chassis? I did the trailing arm adjusters that eliminates the shims and now the that it’s done I’m wondering if the body is going to fit?
Do you know if it does?
Should fit. I did the original frame with the body on. The second frame, got sold. I retired early, then decided to go back to work. I sold some stuff preparing to move (the frame) and then stayed here. The frame I had bugged me a bit, because it really wasn’t good enough to spend a lot of hours on. So selling it was maybe a good thing. Start with a better one if I try again.

Start a thread on your upgrade. I’m interested to see.

Edit: the only interference is taking the bolts out or putting them in, I cut the fender flares.

Last edited by rtj; 02-16-2020 at 08:00 PM..
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  #280  
Old 03-05-2020, 10:58 PM
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Another big dollar super (hyper?) car, but Iíve never seen the canards (vortex generators on steroids) before. He says they give big drop in drag.

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