Speed run car: OFNA Ultra GTP - Neu 2215

[lutach]

Still good. Man you can gear that thing to the moon if you only pulling those amps.

I did some testing this weekend and got the OFNA up to 73 mph.



But after I got 73mph, I started to push it further and the car had a blow over. On this run, I could definitely tell the car was faster than 73, thats when the nose of the car picked up and it took off:





As far as I can tell the damage is superficial and none of the vital components were affected. The body and right front tire seemed to absorb most of the impact. I have much more info at my blog. I have data from my Eagle Tree for those 2 runs.

This is what the car looked like before the takeoff.

[snellemin]

wow, blowover with that heavy of a vehicle!!!! Time to vent your body man.

Originally Posted by snellemin

wow, blowover with that heavy of a vehicle!!!! Time to vent your body man.

Vent?

[snellemin]

yea drill/cut some holes in that body to release air going underneath the body. Works on my camaro body. You need to follow what the dragracers are doing and kinda corporate some of the ideas into your speed demon.

I had blowovers at around 57mph before and the last time I ran the camaro with a few holes in it, I had no blowover at 67mph. This Saturday I will see what I can get out of the body with an extra cell.

Originally Posted by snellemin

yea drill/cut some holes in that body to release air going underneath the body. Works on my camaro body. You need to follow what the dragracers are doing and kinda corporate some of the ideas into your speed demon.

I had blowovers at around 57mph before and the last time I ran the camaro with a few holes in it, I had no blowover at 67mph. This Saturday I will see what I can get out of the body with an extra cell.

Yea, I already cut the back of the body:



I could put 1,000 holes in the body or not even run a body and it would still blow over. Its the positive angle of attack of the chassis that caused my blow over. The chassis plate was acting like a wing. The rear of the car was scraping the ground and the front of the chassis was much higher than the back. I wasn't expecting to get these speeds so I didn't change the suspension much from stock. I need to put stiffer springs in back and play with the ride height to keep the chassis level or at a negative angle of attack to the oncoming air.

[Serum]

I would ditch the inline eagletree, it will be faster without. It adds resistance, guaranteed. i wouldn't use an inline measurement.

Originally Posted by Serum

I would ditch the inline eagletree, it will be faster without. It adds resistance, guaranteed. i wouldn't use an inline measurement.

I just want to use it to see if my calculations for my amp draw were correct and I'm not pushing the motor/batteries/ESC too far. I don't plan on using it when I want to do a total "balls out" run.

[jayjay283]

Originally Posted by B4maz

I did some testing this weekend and got the OFNA up to 73 mph

As far as I can tell the damage is superficial and none of the vital components were affected. The body and right front tire seemed to absorb most of the impact. URL]

This is what the car looked like before the takeoff.[/URL]

that was awesome !!!! 10 10 10 !!!

Video, pics and details here

Video of 83 mph run:



Data for 83 mph run:



Video of 81 mph run:



Data for 81 mph run:

[tc3_racer_001]

crazy.

[MTBikerTim]

With the eagle tree graph you can click the chart settings button then go to the export tab you can save the chart as a jpeg instead of having to do print screens.

That is amazing how tall the gearing is on that and only 12000 rpm too. I'm also surprised you aren't using foams. Aren't the rubbers ballooning? Nice car though.

[tc3_racer_001]

didnt you see the site, with the foams, just destroyed, looks like it would eat them for breakfast and come back for more each run... rubber while it tears may (im not sure) hold up better... and ballooning = more speed :P

[MTBikerTim]

Originally Posted by tc3_racer_001

didnt you see the site, with the foams, just destroyed, looks like it would eat them for breakfast and come back for more each run... rubber while it tears may (im not sure) hold up better... and ballooning = more speed :P

But it also leads to instability and more air under the chassis. I have seen the exploded foams but isn't there a manufacturer who makes foams that don' explode. I thought mod man was talking about them at one point.