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Rennline has promised a 991.2 Ducktail before the end of the year. I have been harassing/encouraging them for quite some time now and most recently at RennSport Reunion.
Man I hope it comes soon I really want a Ducktail for Christmas
PROS: Appropriate temperatures maintained. Non restricted airflow. Downforce 150 lbs at 100mph with grip increase to 5.8%. No added wind noise. Finished product that I aesthetically enjoy!
CONS: Pricey! Total cost $5700. Took a long time to figure out the physics while not loosing the entire look of the ducktail. Form vs function balanced out but was at a cost.
LESSONS LEARNED: Air vents can be smaller by about 1.5cm in height if length maintained. Reinforced skeleton with fiberglass bolsters while closing off the interior upper part of the wing was imperative to achieve the proper flow to the turbos and allow then needed aerodynamic parameters due to eliminating excess drag and unwanted turbulence. Bottom
cutouts on the ledge allowed unrestricted airflow at speeds where OEM wing needed deployment. We couldn’t achieve that without those openings.
Incredible looking. I surprisingly like the vents in it. I had a .1 with a ducktail and loved it but always thought it looked a tad chunky but wish I could do something on my .2. If this ever gets into some sort of production at a lower cost I am in!
Heck I'm in at that price, this is the one piece that as alluded the entire 991.2 aftermarket, I'm sure due to the amount of engineering it took. I'm impressed and jelly at the same time.
Thank you for showing the ENTIRE aftermarket it can be done.
It appears that you have wisely emulated the Sport Classic by recessing and elevating the front edge of the spoiler to create an air channel to the intercooler ducting. Not being an aerodynamicist, the rear openings still confuse me. I can see that they would potentially reduce drag as the rear of the spoiler is a low pressure area but it would seem that flow through the upper part of the spoiler would create a negative pressure area above the intercooler ducts. It could well be that the airflow from the front edge channel negates this but in this case it would seem that eliminating the vents in the spoiler with a slight profile alteration would accomplish pretty much the same thing and now we're back to the Sport Classic design with no vents. Visually, I do like the vents.
In the photos there appears to be a piece running across the front of the spoiler below the front edge. Is this an air guide or structural support?
Also, what have you used for attachment points? I was thinking using a takeoff from the 5 rear bumper cover attachments under the back of the spoiler and brackets to attachment points left over after removing the rear spoiler mechanism, hopefully enclosed under the front engine cover.
Most of all, I would like to express my mainfest appreciation for your efforts. As prior postings have demonstrated, I ran out of talent on this project long ago and your efforts have raised my spirits considerably. Good luck shopping this around for serial production.
Last edited by supercroc; 10-14-2023 at 08:43 PM.
Reason: additional input
I started with this from a guy in Canada (eBay item number 154982079856 seen in the first picture below). He has one left. He claimed that it did not need modification but the temperatures were too high without the mods. Basically a worthless wing for a 991.2 unless you let it deploy via oem deployment which caused too much drag and was unsightly when deployed. It looked really stupid when that ducktail went up at 78 mph and when it was hot. After back and forth with the seller, I decided to keep it and modify it. The vents are needed. Don’t underestimate how much air these turbos need under stressed circumstances! Things can get hairy quickly if you don’t vent them the right way. I added two photos off of websites that sell tech art spoilers and the difference between the 991.1 (yellow) and 991.2 (green) is the added air vents. The pics show the rear spoiler air vent on the green, and there is one on the front of the spoiler as well just not seen in this picture. Nice wing but I did just want a ducktail alone. You need the vents!!!
Wow. that customized bespoke Ducktail is sublime. Like Al Pacino said in one of my fav movies "Heat". "SHE'S GOT A GREAT ***!!!!" Also, I can't help think you could monetize your efforts by mass producing to the masses of 991.2 owners.
I recommend u spend 90 secs on this movie clip...it's that good:
10-06-2023, 10:51 AM
Finally done!
