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  1. SuperBuickGuy

    Plastic Fantastic 2

    I'd be quite interested in the pan. another 24 hours of reflection - and it's as you pointed out, lack of knowledge of the judges that's the biggest issue. Then again, the attorney in me says that it's either accidental or intentional. I can't imagine that the person who runs it doesn't...
  2. SuperBuickGuy

    Internal Body Aerodynamics

    when I finalize the design of my front spoiler - I'm seriously considering sending it to be made in carbon fiber.... the other thing I'm considering is putting another air dam between the front wheels ala IROC Camaros. make it of mud-flap material so it can freely give if hit but it would...
  3. SuperBuickGuy

    Plastic Fantastic 2

    I'll relate what Richard Jung (Rick) has told me. Some of it relates to the discussion above. 1) Optima seems to only only a single wing *I'll post the rule at the bottom 2) In Optima, 8" above the deck is it 3) The suggestion, since SCCA doesn't limit the height, is have two sets of...
  4. SuperBuickGuy

    Plastic Fantastic 2

    A very minor issue of the rack is leaking, but the car did awesome... me, I've got a lot to learn.... the difference I need to make up is 6 seconds. There was someone there who I think does the Optima challenge. He was 6 seconds faster then me (won the class).... I wasn't last - call it 'mid...
  5. mfain

    Plastic Fantastic 2

    Here are two noteworthy quotes from an old Motor Trend aero comparison of the Gen 1 through Gen 5 Corvettes: https://www.motortrend.com/how-to/corp-0905-corvette-wind-tunnel-testing/ "Want to see why a fastback is an advantage in a sports car? This C3 has the iconic vertical rear glass with...
  6. SuperBuickGuy

    Plastic Fantastic 2

    ...under the wing and defeat the whole point of a wing.... but they're popular so I must be missing something.. I'm extending the front spoiler to get it closer to the ground - mostly because my impression of a splitter is that it would trap high pressure air under the hood due to our car's...
  7. phantomjock

    Plastic Fantastic 2

    Here is a project that has been languishing for 5-6 years: With some testing, you might find it not quite in clear air and might still have a bubble trapped behind the rear window. This one in "the tunnel" : Aero balance is important. Note the huge dam on the front: That could be a...
  8. SuperBuickGuy

    Plastic Fantastic 2

    yes but? what follows is a thought process - it may sound like a defense, it's not.... as I respect all of you here, I'm listening to your advice.... even if I don't follow it or seem to be argumentative (which I'm not intending to do so)... whew - with that disclaimer I'm 100% certain that...
  9. phantomjock

    Internal Body Aerodynamics

    If you've poured a cup of 'nog, here is a sleigh that would delight any Santa. This Ferrari looks vaguely similar (well a bit) to the C8 but less angular and maybe a bit more front end from the concept days: I bring it to the thread as there is a very interesting bit that is clearly applicable...
  10. vette427sbc

    Internal Body Aerodynamics

    Another McLaren 720s... with some notable bits and pieces compared to the last one... Under car strakes that move air out from under the car to the side just after the front wheels are very pronounced. Probably around 1.5” tall. The rear wing is active, and also an air brake I assume...
  11. 69427

    Internal Body Aerodynamics

    Let us know what you find. I'm still trying to figure out if the vanes are there to even out/distribute the air mass under the vehicle floor, or if it is there to divert a portion of the air mass out the lower pressure(?) front wheelwell. Which, gives me some incentive to measure the...
  12. rtj

    Internal Body Aerodynamics

    Well, keeping it looking stock makes it tough. Convertibles supposedly have lower drag coefficient. But, that won’t help. Maybe try messing with how the t-tops fit. Could throw a couple of layers or duct tape across the front lip of the t-tops and see if that helps at high speed. Lower...
  13. 69427

    Internal Body Aerodynamics

    My reason for trying some aero mods at the cowl area is that it is the only spot on the upper bodywork that is shaped correctly to cause downforce/drag. Pretty much most all the rest of the forward section of a C3 is shaped to cause lift. In addition to the PC spoiler, I've got a bellypan under...
  14. phantomjock

    Internal Body Aerodynamics

    I'll second what Pappy said. And as I often do, add a few comments; Splitter with Diffuser - these are awesome. By do that (as pappy described) you can effectively double the effectiveness of the splitter. So you can cut it back some - keep inside the "design box" constraints and garner heaps...
  15. rtj

    Internal Body Aerodynamics

    https://www.youtube.com/watch?v=dacP372xljI&app=desktop The front splitter/spoiler is pretty wild looking. Uploaded this week.
  16. rtj

    L88 distance kit

    I wonder how accurate this claim is: https://www.corvettecentral.com/c3-68-82/body-frame/door-floor-roof-fiberglass/68-72-l88-fia-le-mans-front-spoiler-nd-143057 “This is an exact copy of the original L88 FIA Spoiler used during the late 1960's and early 1970's. This spoiler is manufactured...
  17. phantomjock

    Internal Body Aerodynamics

    That is so cool you're filling their mirrors! Now get to PASSING! :rolleyes: I've found a CFD plot of before and after the vanes added. I can't speak to its "creds" but looks better than my "phony airstream plots" a few pages back! Top one is before vanes and lower with vanes - car nose...
  18. phantomjock

    Internal Body Aerodynamics

    Yes. Think Chaparral-Sucker car. Lower pressure under body creates downforce. A diffuser does generate downforce, generally aft of the rear wheels. The undesired-unintended consequence is stiffer springs to counteract the"lifting" of the front end due to a "fulcrum-like effect. The...
  19. vette427sbc

    Internal Body Aerodynamics

    Your CFD makes total sense! Thank you for the explanation. Again, this makes much more sense :thumbs: These are pretty wild cars... I typically like “raw” cars; lots of hp and a well balanced chassis. Not much more. I think this up there with my favorites though! And I definitely get an...
  20. OZgreen69

    L88 distance kit

    Thierry, Here are the Part Numbers for the flares and the major parts for the L88 Road Racing Light Kit. Flares: Left Front - 3958681 Right Front - 3958682 Left Rear - 3958683 Right Rear - 3958684 Plexiglass Lens/Covers: Left/Driver Side - 3961465...
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