Proper Splitter Angle for Flat Splitter Blades
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- Опубліковано 22 лип 2024
- BMW wind tunnel video: • Wind Tunnel Testing Ro...
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Edited with Pinnacle Studio: amzn.to/30NWm11
I'm both honored and embarrassed to have inspired this video.
And we appreciate you !!
I was just about to add one of those “trim” pieces... glad I saw this video first!
love these videos!
Great stuff as always.
Great video AJ!
Good stuff. Gonna go make some adjustments. Thanks!
As my dad would say, you are a very smack man. Now what he really meant to say is you’re a very smart man. Keep up the good work. Your insight is priceless
The best splitter vid I’ve seen
Thanks, great help for my install.
Lots of great info in this! I’m going to try to radius the edge of my next splitter on my RX7! Please keep up the whiteboard aero videos!
Wow thanks for this! Super helpful in explaining the thinking and theory behind mounting. Just got finished up building my own splitter out of plywood, wish I would have had this before hand :)
excellent video sir, thank you so much for your help and knowledge
Appreciate the info. With most modern cars, curb approach is factored in. The 5th gen Camaro has 6* of upward angle at the center front. I tried to build something to make that 0* . It took a 1.5" spacer in the center that tapered downward as you went outward. Tough to keep it all intact after a few track days. Still trying to figure it all out and retain the factory front bumper
Thanks AJ
Thanks for the video response to my question.! It would also be interesting to talk about the optimal distance between the splitter and the ground.
Depends on a lot of things so no solid one answer unfortunately.
Haven't seen reference to the radius on the underside of the leading edge before.
I'll have to do that to mine seeing it has a flat edge.
Good clip.
109 likes and zero dislikes. I love the DIY racing community! Thanks for the tips - time for aero soon.
I would also imagine, the thinner the better (of course maintaining proper structural rigidity/strength). I purchased a half-inch birch composite splitter. The front leading edge is slightly rounded out top and bottom.
Technically yeah, but you want to get close to the ground as well. So either a fatter splitter blade, or a longer air dam will get you closer to the ground.
Im thinking, if some times the perfect rear diffuser (going up from the lower part of the floor to before the end) and rear windshield (going down after the hood until the end of the rear) ideal angle is refered as 12 degrees, will the splitter be the most effective at that angle? Im assuming that such angle would be way to high as something like 3 to 5 degrees are most seen.
Great content as allways, loving all the videos. Probably my favorite aerodynamic subject channel by now, as Kyle have been a little off.
AJ, great explanation. I just wanted clarification one of your last points. If I am installing a splitter, you saying adding a 2.5 inch all lip universal kit, even thought it’s adding rake, you would not recommend that?
Do you have a tut' on how to find the proper level of your car in order to pitch the splitter correctly/ideally?
nice! i wish you would have gave a rough degree angle to start with for downward splitter angle at rest. for us splitter newbs,
I did. Atleast level, or a little downward. There’s no magical degree number, just don’t have it pointing up.
I understand that this video is referring to splitters without flat floor, and also that its aero at and entry stage for people mounting at home. But its worth to mention that if your feeding a raked, sculpted or a floor with an effective diffusor, mounting the splitter upward is often a great way to get more cleaner air and increasing air velocity and downforce. I do this on my TA customer cars after CFD simulations. Widely used in TA motorsports and other unregulated classes. You do move the center of pressure backward since you are creating a little bit of lift at the very front but gain overall DF. How ever if you manage to accelerate the air enough under the floor, the speed will also increase enough under the compression zone so that you still gain net DF under the splitter.
That’s a completely different topic for another video.
@ajhartmanaero Would it be possible for you to make a video like that? I was curious about splitter mounting angles if you are using splitter diffusers. Thanks!
@@blaizify unless the splitter is sculpted just for that scenario or as i mentioned above, cpntinued by a flat/sculpted flat floor run it like aj describes in the video.
Thanks for sharing your knowledge. I´ve heard rumors about splitter thickness. Someone saying thicker is better, but i dont get much why? I would like to build my first splitter in range of 6-8mm (0,24-0,31 inch) of breech plywood
A benefit of thickness is usually strength which is a good thing.
So how much rake do you recommend. 1, 2, 3 degrees?
You can angle the splitter up to 7 degrees downhill. More than 8 degrees will cause separation on the bottom which makes turbulance.
What about 7.1 degrees?
Hi! can ask you ? with a flat booton and rear diffuser will work the same with the splitter angle down?
will not kill that angle the work of the rear diffuser?, i been reading in all books like a little front algle up of the splitter is good to feed air to the rear diffusers.
What if you reverse the charmfer on the edge, so it goes up instead of down?
why not alumalite or dibond? I use it and generally like it, curious your thoughts.
Can u go over GTLM Ferrari front aero, it has a huge fold lip compare to all other race cars.
Nipun Patel maybe. Getting out of the DIY realm on that tho as it’s a whole different animal.
How does this change with splitter tunnels?
Is that front edge the only reason you don't recommend alumilite? I run alumilite and having a curved front edge is something I can make happen. It happened naturally when I ground it off my other racecar coming out of a few bad parking lots. I Just made a new splitter, I used alumilite because I have been getting it used for free.
Is there a specific angle of rake that is ideal? And if the angle is zero, is that a bad thing?
No. All depends on the desired result. And zero is OK since it will rake down under braking, but will be nose up accelerating which will give you terrible balance. Hence wanting it atleast a little down.
Is adjustment of ride height the best way to remedy this or could you for example, add shims to adjust the rake of the splitter itself?
Splitter itself if possible so you don’t change suspension geometry (assuming you’re suspension geometry is dialed in)
How far forward should the splitter be for it to be effective (Max and Min)?
Depends on rules
I have 4" splitter right now and 9 lives big wang, my class and my weight allows me to go up to 6". Do you think i can benefit much from it?
Yes. New splitter and new wing will be a huge upgrade.
Why no Alumilite? Just curious.
Disregard, you explained it later in the video... lol. Keep up the great content. Thanks AJ
Could you, in theory, run a simple aerofoil profile in place of a flat front splitter?
Yes. That’s essentially what splitters are on GTLM and prototypes, and more obviously on F1 cars.
@@ajhartmanaero Follow up question: why do you think it isn't as common in other series of motorsports? Are there inherent advantages to using a splitter instead of a wing?
SAR basically because it’s a lot more difficult for an amateur racer / low budget team to produce a shape that isn’t flat. And once you start moving to more advanced shapes you really need to be analysing it in CFD or you are simply guessing on shapes and sizes etc.
Aj, At what height does the splitter become ineffective? I'm building a splitter, but I can't make it too low for practical reasons.
When it touches the ground.
@@ajhartmanaero I'm think about the other direction.
I think your gripe with alumalite is misplaced. It's a lightweight, strong, and weatherproof alternative to plywood(heavy, not weatherproof) or carbon(expensive and difficult to build). its quite easy to seal/radius with some silicone or rubber edgeing.
Wingman703 I’ve built plenty of splitters with a lot of different materials and it’s my least favorite. Not right or wrong, just not what I’d use.
@@ajhartmanaero What would be your suggusted material for the enthusiast that wants something lighter and more durable then ply, but can't fork up the money for carbon?
How about 2 degrees AOA?
Give it a shot if there’s space.
So when making a carbon fiber splitter, would you still try to radius the lower edge? On my first Carbon splitter, my foam core had a radius on the top edge with the carbon being sharp on the bottom edge.
Preferrably yes. Thats how we do ours now.
People really ask if they should mount a splitter with an upward slant???
Yes. I think more often then not people mount it and don’t check the splitter at ride height tho.
I made it 666 likes 👍🏾 lol
How far under the car is best to extend the flat splitter material to. Like on a Mustang is it advantageous to extend the flat material to the K-member, or even further??
W Matt Pel as far as possible or allowed by rules.
Literally re-working my splitter, came in from the garage, noticed and watched this video. Thanks. www.dariusrudis.net/2019_07_09_C39T0823_FAVORITE.jpg
Hi I had one doubt. My 2021 bmw m340i comes with the m sport package. Which has a front bumper that kinda already has a 2 inch horizontal design to it. Does that already act a splitter ? Plus there is a half inch deflector underneath the car’s body. Do I really need a front splitter which will help in better cornering ?