Windshield wiper sweep examples

[Bill837]

What's funny about this one is that if you show it to folks who do this sort of driving, they just say "Yep, no wiper in the world going to handle a wall of mud.

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[CyberGus]

But all it takes is a few jokers to drive around with them for the NHTSA to open yet another investigation. That might be why Tesla might not offer it.

Tesla could geofence the lights out of public roads.

 

[CyberGus]

What if the lights retract/extend from the roof peak?

 

[Bill837]

Tesla could geofence the lights out of public roads.

I'll be honest, that did cross my mind. Me, I live on a private road, but it is named. Wonder how that works.

 

[CYBRSMTH]

All, please forgive me if this has been covered before, I'll delete if so. I've had this conversation a few time in other places. So this morning, I snapped a few pics while cruising through the Wal Mart parking lot. The standard for wipers breaks the windshield into three columns, and the one in front of the passenger only requires 80% sweep. I think the BAW will do a better job at that than most.

I just looked at my Honda Fit yesterday and the wipers don’t clean that section of the passenger-side windshield either. I think the reason that it stands out so much on the CyberTruck is because of the size of the windshield itself (It’s huge!) I’m sure their are regulations that say X amount of the windshield must be cleared by the wipers and Tesla has complied with that.

 

[Bill837]

I just looked at my Honda Fit yesterday and the wipers don’t clean that section of the passenger-side windshield either. I think the reason that it stands out so much on the CyberTruck is because of the size of the windshield itself (It’s huge!) I’m sure their are regulations that say X amount of the windshield must be cleared by the wipers and Tesla has complied with that.

Why, yes, I'm glad you asked... Lots of preparatory math for things like eye line and shoulder widths and dividing the windshield into columns based on overall dimensions. Looking at S4.1.2 and 1.1.2.1

https://www.law.cornell.edu/cfr/text/49/571.104

Up in the top matter is another tidbit. Which is where it tells us that the part below the heavy tint band up to is all that matters. I dont what percentage of the overall pane of glass is above that line but its pretty huge.

Daylight opening means the maximum unobstructed opening through the glazing surface, as defined in paragraph 2.3.12 of section E, “Ground Vehicle Practice,” of SAE Aerospace-Automotive Drawing Standards (1963) (incorporated by reference, see § 571.5).

 

[CYBRSMTH]

Why, yes, I'm glad you asked... Lots of preparatory math for things like eye line and shoulder widths and dividing the windshield into columns based on overall dimensions. Looking at S4.1.2 and 1.1.2.1

https://www.law.cornell.edu/cfr/text/49/571.104

Up in the top matter is another tidbit. Which is where it tells us that the part below the heavy tint band up to is all that matters. I dont what percentage of the overall pane of glass is above that line but its pretty huge.

It’s all very complex. ‍ Tesla engineers know what they’re doing though.

 

[Crissa]

I don’t know about the bugs, if they flew towards the light bar, I think the airflow might be enough at that point to push all but the biggest bugs over the top of the CT. Theoretically, given that there are a limited number of bugs in a given area, this might divide the ones that do exist into a higher and lower group, thereby flipping half of them over and so reducing the number that you have to scrape off by somewhere around half!

However, it lights up more of them, closer to the driver and the camera system, before the light hits the road. So it has the brights-in-dense-fog problem but doubled.

I'd find it useful in stormy weather when I have to check for downed lines and branches (how would a geofence know the road needs to be or is closed?) or for camping.

-Crissa

 

[Bill837]

It’s all very complex. ‍ Tesla engineers know what they’re doing though.

Exactly. Like crumple zones, I'm amazed that people honestly think that this thing can't pass crash tests. That level of stupidity blows my mind.

 

[JWass]

Yeah, the BAW will do the job just fine. The CT has a front windshield that is as tall as it is wide. Typical windshields are half the height or less than the width. So one large wiper will get it done

 

[happy intruder]

An extra light over the windscreen means more bugs on the windscreen to as they flu towards the light.

Better off having proper lights lower down, plus that's less parts and wiring.

An external light bar mounted on the roof apex will upset aerodynamics and reduce range.

not to mention there could be increased drag

 

[FutureBoy]

Amazing. This thread about the wiper is 65% about overhead lights. What a hijack.

 

[Bill837]

Amazing. This thread about the wiper is 65% about overhead lights. What a hijack.

Well, give that light was supposed to be behind that glass, its not a huge diversion. I as the OP certainly don't mind. You want more wiper action, lets go.

I'm hoping for a good clean shot of the passenger side of the wiper. I thinks its plumbed for washer fluid, but all the shots so far show only the drivers side face of it. And I think logically, it sort of has to be on the side so the fluid can lead the wiper for "dry" clearing wipes like you during pollen season. .

 

[JBee]

I don’t know about the bugs, if they flew towards the light bar, I think the airflow might be enough at that point to push all but the biggest bugs over the top of the CT. Theoretically, given that there are a limited number of bugs in a given area, this might divide the ones that do exist into a higher and lower group, thereby flipping half of them over and so reducing the number that you have to scrape off by somewhere around half!

It's possible some will miss it and go over the top. In my experience here though most are buzzing around under 3ft, especially hoppers etc, and them seeing you early means more of them are airborne by the time you get to them, so more of them end up getting hit. Things like mozzies actually want to fly into the light as well. My experience with the tractor/truck with overhead cab worklights is they go for them and end up on your windscreen too.

I'm thinking it comes down to how much airflow is going over the windscreen, which depends on how fast you are going, and how much mass the insects have and if they can change direction in time, or if they are carried over in compressed airflow. Then there's the question what percentage of insects are attracted to the light and would fly towards it.

The angle of attack of the windscreen also plays a critical role in that bugs with small mass also have small inertia and can change direction within the compressed airflow near the windscreen. This is fairly self evident when you get them spread in aerodynamic bug splatter lines around the vehicle. Like mirrors, where the side closer to the vehicle has a higher density of bug splatter than the outside of the mirror where the angle tappers off.

The flattest angle windscreens I own are my two Priuses, which are probably pretty close to a CT windscreen angle. There I have often observed that the nose of the vehicle is covered in small bugs, but the windscreen is fairly clear, with only slight streaks. However with large bugs, like grasshoppers, that like to sit on the warm road in the evenings, they tend to hit everywhere, and also make very long streaks on the angled windscreen which nearly makes it worse, because they block even more visibility that way, from just a few impacts. Without more imperial evidence than that, I think a high percentage of large insects actually impact the vehicle and are unaffected by airflow across the windscreen. Just like small birds etc, there simply isn't enough airflow mass over the windscreen to change their direction in time.

So the question is how many larger insects are attracted to light, and how the overcab lights would increase the amount of insects at the altitude of the windscreen and increase splatter.
I think overall, the more insects you can get to impact around the height of the lower headlights the better, and that a higher and lower light will distribute them between the lower and higher lights, making more windscreen impacts likely.

 

[JBee]

Amazing. This thread about the wiper is 65% about overhead lights. What a hijack.

Lol.

But as my post above demonstrates, for those of you that read my posts very carefully, they are both interrelated subjects. The wiper function is impacted by the position of the lights, in that lights attract bugs for the wipers to wipe....and... in turn the wiper could actually be wiping the top bar lights, at least on one side, to keep them clean, so they can attract more bugs to wipe, and so on.

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