Traxxas xo-1!

[Thirdgen89GTA]

Originally Posted by anunaki

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!!!

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.

_________________

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.

[Thirdgen89GTA]

Originally Posted by Arct1k

Well I'll I'm not sure about if the wing stays will take 80lbs but the springs might as there is probably 70lbs of lift under the car to offset the downforce...

I'd say the wing stays can probably withstand about 30-40lbs of force. But that its unlikely a 1/8th scale wing will produce that kind of downforce. I agree that the suspension is not designed to take that kind of force. I know I can easily press on the back of my truggy and bottom it out. I'm running AE 16mm bronze springs in the rear which are rated a 4.09lb/in. The rear shocks are filled with 60wt oil. I'll probably step down to 50wt fluid, the rear can get unsettled in rhythm sections.

[josh9mille]

Oops, accidently double posted while editing.

[josh9mille]

Originally Posted by anunaki

Listen dude i work on top fuel dragsters i refuse to argue with you but let me say this,can you name somthing that goes stupid fast that doesent have a wing?The degree/angle always determinates how much force the back wheels apply along with suspention or struts i.e "hookin upp".These brushless cars never hook up you could be at 80 mph and then..tire spin they skate the street the whole way unless you're a beast with throttle control then you wont smoke the tires.by the way what you wanna do wanna line up if the race is right ill fly you down here!

So you changed oil on a dragster once and now you are a pro in aerodynamics? J/K A quick google search came up with anywhere from 3500 to 7500lb downforce on a top fuel car wing. Elephants weigh up to 25,000lbs and average about 16,000lbs. So yes I guess it could be like an elephant sitting on the wing of a dragster...a very small elephant. So now lets scale up the 80 pounds of force on the buggy wing @ 70mph, it comes to 5120lbs at a scale speed of 560mph. Pretty low compared to the dragster. The math shows its plausible. Ill admit I was wrong. And no, im not traveling accross the country to drag race an RC car, however if you want to pay to send me, my doorslammer car and my 2 man crew down there to drag race against your similar street legal car I would be all over that! And no, putting a license plate on the back of a top fuel car does not mean it is street legal!

Here's my set up now lx1e Steve neu built 1521 thunderPower 6s 65c Mamba XL bec disabled added capacitor banks alpha tires rear different spooled. All shocks have no shock oil no downforce in wing and GPS 123mph radar gun124mph the same one you see in my avatar i will say no more my noble knight

[snellemin]

My post got deleted at Traxxas when I called out traxxas employee sofasticantseeit on him never seeing a 3 lbs car go 120mph(Philldog car). He claimed that the equipment alone to do so would take 3lbs. Told homeboy that a 2.5lbs dragsters go over 100mph in less than 1.3seconds within 132ft. And before you know it, my post and his post never excisted LOL.

[bruce750i]

^That's gone already? I just read that this morning. Funny stuff.

Try to to delete it over here sofasticantbbelieved.LOL

Originally Posted by snellemin

My post got deleted at Traxxas when I called out traxxas employee sofasticantseeit on him never seeing a 3 lbs car go 120mph(Philldog car). He claimed that the equipment alone to do so would take 3lbs. Told homeboy that a 2.5lbs dragsters go over 100mph in less than 1.3seconds within 132ft. And before you know it, my post and his post never excisted LOL.

Amazing thats what they do though the truth hurts man and I second what
you said.

[wellby]

Most Bonneville cars are much heavier than you would think it helps plant the car along with the proper aerodynamics. Reducing weight helps acceleration but not overall top speed, even a little extra weight in the right place will help

[Big House]

Originally Posted by anunaki

Here's my set up now lx1e Steve neu built 1521 thunderPower 6s 65c Mamba XL bec disabled added capacitor banks alpha tires rear different spooled. All shocks have no shock oil no downforce in wing and GPS 123mph radar gun124mph the same one you see in my avatar i will say no more my noble knight

If I were in Florida, I would take that race for fun. Might not qualify but I think my Super RS4 on 6s would get you. Not a 33rd but pretty close.

[Thirdgen89GTA]

Originally Posted by wellby

Most Bonneville cars are much heavier than you would think it helps plant the car along with the proper aerodynamics. Reducing weight helps acceleration but not overall top speed, even a little extra weight in the right place will help

Exactly, weight is free downforce without drag penalty. Most salt flats cars are very heavy.

Terminal top speed is not determined by weight. In fact, weight has little to no effect at all on terminal top speed. Its greatest factor is acceleration (either longitudinal, or lateral)

Terminal top speed is most affected by aerodynamic drag and the power required to overcome that drag.

Hey guys please please youtube" traxxas xo1 review:vid 3 after run review by squirelod or somthing. video 3 guys must see

[snellemin]

What part was a must see? The fact that he uses Deans connectors for a high amperage setup and wonders why the ESC went up in smoke and solder started melting off. Not the brightest bulb around.

[josh9mille]

That guys videos have been the joke of RC for quite a while now.

[snellemin]

I pushed Squirrelies buttons on youtube, when I called him out using Deans.