Final Guess of Drag Coefficient (CD) value of the CT (No 'Price Is Right' Welcomed LOL)

[Macgyverfever]

Chatgpt estimates 296 miles of EPA range for a truck with a CD of 0.39 (initial) and a 123kwh battery pack weighing a total of 6670lb. Changing the CD to 0.30 (something Elon has stated would be hard) estimates the range to then be 353 miles. Also assuming a 175kwh battery pack (which was a recent rumor) with a CD of 0.39 and 0.30 and a tri-motor weight of 6,890lb estimates 417 and 496 miles of range, respectively. Interesting. I believe they've had to lower the CD <= 0.30 ; quite a bit from initial.





Edit: I did some estimates myself - here's my work shown in a special CAD program:

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[anionic1]

Very interesting.

 

[JBee]

I think it should be under 0.33 Cd.

But don't forget that front Al section area is the other half of the drag equation, so keeping that smaller than say a F150 etc also reduces drag. If it 10% less frontal area it also that much less drag.

 

[Macgyverfever]

I think it should be under 0.33 Cd.

But don't forget that front Al section area is the other half of the drag equation, so keeping that smaller than say a F150 etc also reduces drag. If it 10% less frontal area it also that much less drag.

Assuming 10% less frontal drag than an f150 yields for tri-motor 0.39 @ 470mi and 0.30 @ 553mi. More interesting.

 

[Diehard]

If you are worried about drag and efficiency get a model 3 or Aptera. If you are getting a truck, drive fast and supercharge more often or slow and save a few bucks. A truck with a Cd of 3.0 doing 80 mph consume the same energy as a truck with Cd of 3.9 doing 70 mph.

p.s. Rivian is claiming 3.0 so CT should be close.

 

[Macgyverfever]

If you are worried about drag and efficiency get a model 3 or Aptera. If you are getting a truck, drive fast and supercharge more often or slow and save a few bucks. A truck with a Cd of 3.0 doing 80 mph consume the same energy as a truck with Cd of 3.9 doing 70 mph.

p.s. Rivian is claiming 3.0 so CT should be close.

I think 500 mile range should be obtainable - I'll leave her there lol.

 

[Diehard]

I think 500 mile range should be obtainable - I'll leave her there lol.

I agree with your general point of view which I assume is until battery density improves significantly, efficiency is all we have to work with. I think I am just projecting my own issues here a bit. I use truckiness of my truck may be 5% of the time at most and 95% of the time, I am dragging this big ass inefficient thing around. The internal fight between utility and efficiency sometimes manifest itself on the forum in a wrong way. Until my multiple personality disorder is fixed, I will have to label my posts. Previous comment was posted by Aptera side of me.

 

[Macgyverfever]

I agree with your general point of view which I assume is until battery density improves significantly, efficiency is all we have to work with. I think I am just projecting my own issues here a bit. I use truckiness of my truck may be 5% of the time at most and 95% of the time, I am dragging this big ass inefficient thing around. The internal fight between utility and efficiency sometimes manifest itself on the forum in a wrong way. Until my multiple personality disorder is fixed, I will have to label my posts. Previous comment was posted by Aptera side of me.

Yea I too think the cybertruck should come with a free Aptera with every purchase. Thank god for my wife's M3RWD! I be carpooling...

 

[PilotPete]

If you are worried about drag and efficiency get a model 3 or Aptera. If you are getting a truck, drive fast and supercharge more often or slow and save a few bucks. A truck with a Cd of 3.0 doing 80 mph consume the same energy as a truck with Cd of 3.9 doing 70 mph.

p.s. Rivian is claiming 3.0 so CT should be close.

We did the calculations on another thread. 0.30 v 0.39 is 80mph v 65 mph as I recall.

EDIT: I didn’t recall correctly! See below.

 

[Diehard]

We did the calculations on another thread. 0.30 v 0.39 is 80mph v 65 mph as I recall.

Are you messing with me again? That was 0.46 not 0.39
https://www.cybertruckownersclub.com/forum/threads/gm-vs-cybertruck-battery-size.9343/post-180895

 

[scottf200]

Chatgpt estimates 296 miles of EPA range for a truck with a CD of 0.39 (initial) and a 123kwh battery pack weighing a total of 6670lb. Changing the CD to 0.30 (something Elon has stated would be hard) estimates the range to then be 353 miles. Also assuming a 175kwh battery pack (which was a recent rumor) with a CD of 0.39 and 0.30 and a tri-motor weight of 6,890lb estimates 417 and 496 miles of range, respectively. Interesting. I believe they've had to lower the CD <= 0.30 ; quite a bit from initial.

Edit: I did some estimates myself - here's my work shown in a special CAD program:

0.39 / 0.44
Links in the below tweet.

 

[Macgyverfever]

0.39 / 0.44
Links in the below tweet.

First off, awesome thanks for sharing!

Second, do you think 0.30 is possible?

 

[scottf200]

First off, awesome thanks for sharing!

Second, do you think 0.30 is possible?

Not sure but there are various tricks that Rivian did on a 'regular' looking truck to do it (Cd 0.30)

See this video:

 

[PilotPete]

Are you messing with me again? That was 0.46 not 0.39
https://www.cybertruckownersclub.com/forum/threads/gm-vs-cybertruck-battery-size.9343/post-180895

Oops, I sit corrected. It was 0.46. Although I did say “as I recall”, and I just sucked at my recall. There were SO many new posts, I didn’t take the time to look at the previous conversation. My bad.

I ain’t messin’ with you D. You’re keeping me true!

 

[scottyah]

.335!

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