Performance question: Under chassis aero package....Is it worth it?
#31
The thread was actually about rear diffusers. Mounted at the rear underside of a Car, to clean up air flow and reduce drag, reduce lift and add downforce. The effect of a diffuser couldn't be considered as stand alone; it's effect is dependent by the way the rear wing works, the effect of rotating tires, side skirts, the angle divergence, and how it influences the pitch an roll behaviour of the car. The ideal diffuser would have a divergence angle starting at about 7 degrees, but increasing smoothly up to around 20 degrees.
I'm not an expert, but with a little bit of time spent on the internet reading about how air reacts to passing over surface areas, and how to control it, led me to the original design. Then talking to others that have worked on this before, has helped me come to the final design that we tested. I'm not saying that this will be the final design. Nor am I an expert, but I will be working on a few more ideas this week to test this coming weekend to find the best possible combination. I will say that I have already abandoned the idea of a front and side splitter/diffuser. The bodies we have today give all the downforce needed. The diffuser is intended to take waisted and/or trapped air flow and direct it into someing of benefit while not to bottle up air flow going through the car.
Thinking about this, if a 1/10th car is traveling at 50mph, at scale speed, that would be 500mph. Push air at 500mph under a real car and what happens?
#32
I dissagree with this though. I know what the car handled like, and I know what tire wear was like as well. I have REAL RESULTS to base this on. As well as 2 others that tested this with me.
#34
it states.....
5.18 under body/chassis aerodynamic aids of any nature are not allowed
so for any IFMAR sanctioned events (i.e. the worlds), it's a no no
AFM
#35
I knew it was not allowed, IFMAR rules are a little more specific. I have to look it up and post it here.
#37
#39
Of course, the ultimate diffuser is something like a 1/8th body. Keep the nose close to the ground to keep as much air as possible out from under the body and have the back end wide open to suck what little air is there out.
#40
#41
Tech Regular
I really wonder how they are going to agree if its a performance enhancement or not.. simply put, what if i modify the A-Arms to have an aero package on them.. but simply state that this is for strenght?
#42
The only rules that have anything to do with aerodynamic devices are:
This rules is listed under bodies:
5.4.8 Bodies must remain as originally approved. Flaring front fenders or making any other aerodynamic modification is not permitted.
6.5.1 Definition: Wings are aerodynamic devices attached to vehicles to increase down force and traction when a vehicle is traveling at speed. The dimensions of wings vary depending on the class of racing, and are described in class rules or specifications.
but this does not address chassis attatched devices.
#43
rcfoolz,
what type of rear diffuser style are you trialing? the F1 style(1 page back), or the more common touring car style diffuser(which is what most 1:1 cars have).
ive been trialing out some front diffuser stuff with my nitro. i made the underbody perfectly flat, with some lexan plastic, and added a front lip with aero vanes in it. the lip extends from the chassis, past the foam bumper and sticks out from underneath the front of the body. with the addition of some small canards i found it helped keep the nose down during high speeds(only in a straight line). i had to get the front lip as low as possible for it to show some difference. however it gets easily damaged...
i havent yet moved onto rear diffuser, so im interested in what your working on.
what type of rear diffuser style are you trialing? the F1 style(1 page back), or the more common touring car style diffuser(which is what most 1:1 cars have).
ive been trialing out some front diffuser stuff with my nitro. i made the underbody perfectly flat, with some lexan plastic, and added a front lip with aero vanes in it. the lip extends from the chassis, past the foam bumper and sticks out from underneath the front of the body. with the addition of some small canards i found it helped keep the nose down during high speeds(only in a straight line). i had to get the front lip as low as possible for it to show some difference. however it gets easily damaged...
i havent yet moved onto rear diffuser, so im interested in what your working on.
#44
rcfoolz,
what type of rear diffuser style are you trialing? the F1 style(1 page back), or the more common touring car style diffuser(which is what most 1:1 cars have).
ive been trialing out some front diffuser stuff with my nitro. i made the underbody perfectly flat, with some lexan plastic, and added a front lip with aero vanes in it. the lip extends from the chassis, past the foam bumper and sticks out from underneath the front of the body. with the addition of some small canards i found it helped keep the nose down during high speeds(only in a straight line). i had to get the front lip as low as possible for it to show some difference. however it gets easily damaged...
i havent yet moved onto rear diffuser, so im interested in what your working on.
what type of rear diffuser style are you trialing? the F1 style(1 page back), or the more common touring car style diffuser(which is what most 1:1 cars have).
ive been trialing out some front diffuser stuff with my nitro. i made the underbody perfectly flat, with some lexan plastic, and added a front lip with aero vanes in it. the lip extends from the chassis, past the foam bumper and sticks out from underneath the front of the body. with the addition of some small canards i found it helped keep the nose down during high speeds(only in a straight line). i had to get the front lip as low as possible for it to show some difference. however it gets easily damaged...
i havent yet moved onto rear diffuser, so im interested in what your working on.