Quote:
Originally Posted by anunaki
(Post 417534)
Hey 100% i agree with every thing you said to the t. My ofna would blow back also just like you said but i took off the "high downforce wing"which was made for tracks i put in a tri level wing and removed two levels because the wing dosent need downforce at least for me but as you say with the ofna high downfoce wing at 65 mph it blows back ,we call it dancing which is bad for racing really bad! As for the buggy's body i use industrial velcro all around and i have vented fully the body for positive air flow and cooling .The guy i raced took the body off too....... spinnnn outt it also needs weight!!!
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I wish I had read this thread in its entirety rather than just catching the post that got my attention.
So much mis-information!!!!
The Traxxas XO-1 is far more aerodynamic than your buggy Anunaki. It has a much lower Coefficient of Drag, which means it requires less power to reach the same speeds. It also will produce more downforce with less drag as well than a 1/8th scale buggy.
This is due to the fact that the body is fairly sealed, and the undertray will reduce the parachute effect most 1/10th and 1/8th GT bodies have because they don't have a tray. With a smooth body tray and the rear diffuser will cause the air under the car to decelerate when it hits the expanded section in the rear, again increasing rear downforce with a minimal increase in drag as compared to a full on wing. It takes advantage of the vacuum behind the car.
The full width front, canards, and splitter work together to reduce airflow under the body, and increase downforce on the front wheels. The splitter reduces underbody air flow, acting like an air dam. The side canards increase downforce, and work exactly like a wing does.
There is a NACA duct in the tray This is draws air from undertray over the motor for cooling.
How does all this compare with a 1/8th scale buggy? MUCH more efficient. Does a 1/8th scale buggy with wing produce more downforce? Yes. The massive rear wing creates alot of downforce, and its location aft of the rear wheels leverages that downforce on the rear wheels at much slower speeds. The further back the wing is mounted the more leverage it has. This much downforce is not needed for high speed runs. The wings are designed to produce usable downforce in the average speeds seen by buggies which is between 10 and 50mph depending on track size and layout. A 1/8th scale buggy much like an F1 car is CONSTANTLY accelerating. Buggies NEVER reach terminal speed on a track, most of them are far too short.
How about the partial body vs full body? Well the partial body is mostly sealed so the parachute affect is minimized, and the smaller area means that airflow has less area to act against if air gets under the car. However the partial body exposes the shock towers, wheels and suspension components directly to external air flow. This is a massive drag increase and creates tons of turbulence. 1/8th buggies due to their body design have little to NO downforce in front, in fact they have a fair bit of LIFT.
Another item to consider is the tire rotation, at 50mph the bottom of the tire where it contacts the ground is technically not moving at all relative to the chassis. However the TOP of the tire is moving TWICE as fast as the chassis. You don't wanna know what this does to the airflow. Massive turbulence. Look at the front wing of an F1 car, notice how the wing is designed to direct air up and OVER the tires? Thats to reduce the turbulence i just described.
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Also, the X0-1's OFFICIAL top speed is 100mph, but in all likely hood based on some of the video's I've seen showing telemetry readings a fully charged pack will allow it to reach speeds in excess of 110mph. I wouldn't be surprised to find out its top speed is closer to 115mph.
