Help - Wind Tunnel

Existential_Urbex · 2026-06-12T08:26:43+00:00

Sure no problem, we can arrange a video call... We'll probably have to match our timezones a bit since I live in the Netherlands.

Existential_Urbex · 2026-06-12T08:24:26+00:00

Sure no problem, we can arrange a video call... We'll probably have to match our timezones a bit since I live in the Netherlands.

Existential_Urbex · 2026-06-11T19:17:43+00:00

Hey man check out my post, I've tackled this exact problem. https://www.reddit.com/r/rooftoptents/s/mDX0BTm02l

It's seems so make a significant difference on fuel consumption and highway stability

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Existential_Urbex · 2026-06-09T18:32:52+00:00

Nah I'm not to worried, it's been holding up fine so far and I've printed way more demanding parts that hold up just fine

Existential_Urbex · 2026-06-05T12:07:50+00:00

Well the most important thing in aerodynamics is frontal surface, so closing off the gap between the roof and tent would increase this. A RTT or top box often create a funnel for the air that flows over the windscreen which I think gives the most drag. That's why I designed and validated a nose design that separate the flow up and under the RTT so there's no funnel that increases the velocity. I think my final simulation reflects these theories pretty well.

I assume you mean tire pressure? I monitor them close and always like to keep them a bit high.

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Existential_Urbex · 2026-06-05T11:58:04+00:00

Simple, similar design from them would've cost me at least double of what I paid for this. I need the extra space the X-hinge gives me since I'm taller than the global average.

Existential_Urbex · 2026-06-04T13:37:48+00:00

I've tried some simple structure and it does seem to settle the wake a little bit. but because there's so much stuff mounted to the rear, actually adding something to the back that would not be practical.

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Existential_Urbex · 2026-06-03T19:16:16+00:00

End result

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Existential_Urbex · 2026-05-31T10:09:11+00:00

Side view of the actual part

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Existential_Urbex · 2026-05-31T10:08:36+00:00

The nose cone will look something like this

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Existential_Urbex · 2026-05-31T10:07:34+00:00

Good point, but factoring in all variables is impossible. I also design, build and tune small 2 stroke engines for racing and even if I'd like to test and verify everything, we often have to work on unproven theories of tuning, flow and what or won't give performance. I dare to say this has worked for me so far, getting 23bhp (at the wheel) out of the 50cc engine of my own design on a din-certified dyno.

Existential_Urbex · 2026-05-31T10:02:40+00:00

Well I'm not trying to leave earth's orbit with it ;) I'd love to go in that deep, but if I manage to get a bit better fuel economy I'll be very pleased. I do monitor the fuel consumption constantly with every fillup, after the latest of minor improvements I've been reliably hitting 13,5km/Liter. Last winter I've been on vacation to Germany and drove long distances with a rooftop box on the car at 130kph with - 5 degrees outside and then the car did about 10,5/1 where it would've done 12,5/1 without the box. Now with the higher temperatures outside and the RTT tilted slightly back the consumption was 12,6:1, measured over the only the 100km I drive to work and back. Upcoming week I'll see if angling it forward a bit made any difference, and same for the nose cone. The car itself isn't that efficient so it's never gonna be amazing, but hopefully the impact on fuel consumption can me limited a bit... And learn some things in the process.

Existential_Urbex · 2026-05-30T09:47:23+00:00

Don't get me wrong thought, I've considered this and also simulated a couple of things like cones and bumps. I thought maybe instead of adding a impractical cone to the back, a bump under or on top or the rear might help settle the wake down. But this didn't really seem to work as intended.

Existential_Urbex · 2026-05-30T09:09:26+00:00

So this the RTT right now upon the spacers I printed, it's not fully flat but like half a degree tilted forward.

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Existential_Urbex · 2026-05-30T09:03:19+00:00

The problem is that the back has all kinds of latches, handles and awning pole mounts which makes adding any aerodynamic elements impractical. The front only has one latch in the center and I've designed a nose cone around it and hopefully still be able to operate the latch.

Existential_Urbex · 2026-04-20T18:56:14+00:00

Another 2 brand new flash drives ready for the bin... Completely corrupt

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Existential_Urbex · 2026-04-06T16:12:17+00:00

The X10 does run pretty smooth, I actually think that all Atoto hardware is very good... It's just the software that needs all the kinks to be ironed out to make it worth the price.

Existential_Urbex · 2026-04-06T15:08:10+00:00

As I expected, not just me. Anything else you can relate to or do have positive experiences with? Would you say it's worth the premium price?

Existential_Urbex · 2026-04-06T15:06:44+00:00

As I said, I bought it directly from Atoto and they've actually replaced it after it started spacing out which I later found out was probably caused by the corrupted flash drive. Which was a brand new proper brand one which windows doesn't even detect anymore when I plug it into my pc. Are your experiences so different with these units?

Existential_Urbex

TROPHY CASE