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Search took 0.07 seconds. Search: Posts Made By: bwilson4web
Forum: Aerodynamics 01-05-2024, 10:39 AM
Replies: 37
Views: 2,518
Posted By bwilson4web
This sounds like an excellent experiment using...

This sounds like an excellent experiment using cardboard and duct tape. Benchmark 10 miles each way using A-B-A at say 65 mph between 10 PM and 5 AM.

Then take 5 mph steps up to find out the...
Forum: Off-Topic Tech 01-02-2024, 05:26 AM
Replies: 4
Views: 478
Posted By bwilson4web
I placed my order two days ago: Creality 3D...

I placed my order two days ago:

Creality 3D Printers CR-M4 Largest FDM 3D Printer Fast-Heating Bed Dual Y-axis
Total: $953.15
Item ID: 155875998046
Seller: 3d-printer-online
...
Forum: Aerodynamics 12-31-2023, 08:23 PM
Replies: 37
Views: 2,518
Posted By bwilson4web
Most of the Tesla braking is regenerative, not...

Most of the Tesla braking is regenerative, not friction. There is a 'rubbing' probably there to minimize rust on the disc but not enough to make them hot.

You've reminded me to check for...
Forum: Aerodynamics 12-23-2023, 03:18 AM
Replies: 37
Views: 2,518
Posted By bwilson4web
In one of the recent Cybertruck reviews, the...

In one of the recent Cybertruck reviews, the designer commented the closed covers reduced aerodynamic drag.

Bob Wilson
Forum: Off-Topic Tech 12-12-2023, 11:48 AM
Replies: 4
Views: 478
Posted By bwilson4web
Anyone doing ABS, 3d printing?

Hi,

I want to make ABS wheel covers for my 18", after market wheels. The pizza pan covers are OK but the plastic tie-wraps are a pain.

Based on the Tesla Cyber Truck covers, I believe 3d...
Forum: Aerodynamics 12-07-2023, 09:57 PM
Replies: 37
Views: 2,518
Posted By bwilson4web
I wonder if the Cyber Truck wheel covers are air...

I wonder if the Cyber Truck wheel covers are air tight?

There appears to be a gap around the rim but I can't tell if it is a by-pass or air leak from the interior of the wheel.

Bob Wilson
Forum: Aerodynamics 12-04-2023, 04:36 AM
Replies: 854
Views: 65,157
Posted By bwilson4web
And the front wheels would have compacted the...

And the front wheels would have compacted the snow and ice as well as plowed away what might have otherwise come in contact with the rear wheels.

Bob Wilson
Forum: Aerodynamics 12-02-2023, 11:08 AM
Replies: 22
Views: 1,646
Posted By bwilson4web
I took one frame and visually enhanced to show...

I took one frame and visually enhanced to show the air curtain vent:
https://ecomodder.com/forum/attachment.php?attachmentid=34405&stc=1&d=1701533223
Thanks to @Vekke who made the video that...
Forum: Aerodynamics 11-27-2023, 01:17 PM
Replies: 37
Views: 2,518
Posted By bwilson4web
After market wheel. No vendor wheel covers. ...

After market wheel. No vendor wheel covers.

https://ecomodder.com/forum/attachment.php?attachmentid=34379&stc=1&d=1701106361

Bob Wilson
Forum: Aerodynamics 11-23-2023, 11:07 PM
Replies: 37
Views: 2,518
Posted By bwilson4web
The OEM wheels had aero covers (i.e., hub caps.)...

The OEM wheels had aero covers (i.e., hub caps.) Other reviewers have reported testing with and without the OEM covers and showed they improved range. But my wheel vendor has no aero wheel covers ......
Forum: Aerodynamics 11-23-2023, 03:38 PM
Replies: 37
Views: 2,518
Posted By bwilson4web
Correct, closed vs no covers. I have after...

Correct, closed vs no covers.

I have after market, light weight wheels, seven spokes, and lighter weight than OEM Bridgestone ECOPIA tires. Together they improved efficiency up to 45 mph. Above...
Forum: Aerodynamics 11-20-2023, 12:36 AM
Replies: 37
Views: 2,518
Posted By bwilson4web
Correct. The zip ties are cheap, light weight,...

Correct. The zip ties are cheap, light weight, and uniform so no problem with balance. Strong as heck, four of them held the prototype cover on at 100 mph and went through a car wash without a hitch....
Forum: Aerodynamics 11-19-2023, 06:49 PM
Replies: 37
Views: 2,518
Posted By bwilson4web
No one seemed interested. Here are the unpainted...

No one seemed interested. Here are the unpainted ones:
https://ecomodder.com/forum/attachment.php?attachmentid=34345&stc=1&d=1700435473

I've painted them with flat-black to match the tires. But...
Forum: Fossil Fuel Free 11-19-2023, 04:19 AM
Replies: 45
Views: 2,858
Posted By bwilson4web
13% free miles - for the past year, my 2019 Tesla...

13% free miles - for the past year, my 2019 Tesla Model 3 Std Rng Plus got free charging while shopping, meetings, or meals.
$2.50/100 mi - what it cost to operate the Model 3 using home charging....
Forum: Aerodynamics 11-19-2023, 03:33 AM
Replies: 37
Views: 2,518
Posted By bwilson4web
POST TEST ANALYSIS The best estimate, a 4%...

POST TEST ANALYSIS

The best estimate, a 4% drag energy reduction, is ~40% of my end goal, reversing the ~10% battery capacity degradation. But I need to:

Review the SAE paper for further drag...
Forum: Aerodynamics 11-18-2023, 07:26 AM
Replies: 37
Views: 2,518
Posted By bwilson4web
Pizza pan wheel cover testing

I'm going to call it a modest success:
https://ecomodder.com/forum/attachment.php?attachmentid=34342&d=1700310332


thin green line - suggests the pizza pan wheel covers provide up to ~4% at 70...
Forum: Aerodynamics 10-19-2023, 02:31 PM
Replies: 1
Views: 402
Posted By bwilson4web
I'm going to call it a modest success: ...

I'm going to call it a modest success:
https://ecomodder.com/forum/attachment.php?attachmentid=34341&d=1700307238


thin green line - suggests having the pizza pan wheel covers provides up to...
Forum: Aerodynamics 10-19-2023, 12:52 PM
Replies: 1
Views: 402
Posted By bwilson4web
Pizza pan wheel cover benchmark results

Ran benchmarks last night but during a 20 minute charging session, a front passed through. The temperature dropped 6 F and wind direction changed and blew stronger. This would have significantly...
Forum: Aerodynamics 10-07-2023, 12:45 AM
Replies: 111
Views: 6,032
Posted By bwilson4web
One mechanism is energy loss from mechanical...

One mechanism is energy loss from mechanical flex. At higher speeds, the tires suffer increased flexing that steals energy and increases the energy loss.

Heinz Heisler MSc., BSc., F.I.M.I.,...
Forum: Aerodynamics 10-06-2023, 01:04 AM
Replies: 11
Views: 1,665
Posted By bwilson4web
My prototype in test: car wash - no problem...

My prototype in test:

car wash - no problem
100 mph (160 kph) - no problem
standing water (not done, yet)

https://ecomodder.com/forum/attachment.php?attachmentid=34224&d=1696568699
...
Forum: Off-Topic Tech 09-28-2023, 01:09 PM
Replies: 16
Views: 714
Posted By bwilson4web
Fall means falling tire pressure

Just a gentle reminder:


Cooler temperatures reduces tire pressure
Check alignment and tread depth
Snow tires as needed
Good time to replace filters, cabin, and optional engine
Engine...
Forum: General Efficiency Discussion 09-21-2023, 12:57 AM
Replies: 4
Views: 344
Posted By bwilson4web
Evaluate EV battery capacity

Used EVs will become more available and a buyer needs to evaluate the full charge capacity within a couple of hours:

100% SOC kWh ~= charge_kWh / (% SOC_1 - % SOC_2)
% SOC_1 - beginning SOC...
Forum: Introductions 09-16-2023, 05:58 PM
Replies: 5
Views: 983
Posted By bwilson4web
The 2” receiver hitch and 4x8 trailer makes both...

The 2” receiver hitch and 4x8 trailer makes both an ad hoc pickup with a huge bed.

Bob Wilson
Forum: Introductions 09-16-2023, 07:30 AM
Replies: 5
Views: 983
Posted By bwilson4web
Re-introduction Tesla + BMW

Hi,

A former Prius owner, I gained a lot of insights back then. But now I'm EV and PHEV:

2019 Tesla Model 3 Standard Range Plus - bought new, now 115,000 mi with Autopilot+Full Self Driving.
...
Forum: Fossil Fuel Free 03-01-2022, 07:03 AM
Replies: 97
Views: 7,391
Posted By bwilson4web
We have a 2019 Tesla Model 3 Standard Range Plus:...

We have a 2019 Tesla Model 3 Standard Range Plus:

$2.75/100 mi - when I charge at home
~1/3d of local chargers are free while shopping or eating
$3.00/100 miles when staying overnight at a...
Showing results 1 to 25 of 156
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