Search found 13706 matches

by liveforphysics
May 22 2022 8:48pm
Forum: General Discussion
Topic: gas price thread
Replies: 1266
Views: 88999

Re: gas price thread

I've bought gas 3 times in the last 8 years or so, with luck that number might never rise.
Two for other folks who were kind enough to give me rides, and once for a rented RV.
by liveforphysics
May 22 2022 2:45pm
Forum: General Discussion
Topic: gas price thread
Replies: 1266
Views: 88999

Re: gas price thread

I'm seeing $7/gal for premium in SoCal.

Blessings for the quality of the precious air we all share being fiscally discouraged from needless fouling.
by liveforphysics
May 21 2022 10:20pm
Forum: EBike Non-hub Motor Drives
Topic: Bizarre, yet reliable and robust CVT transmission design.
Replies: 14
Views: 2730

Re: Bizarre, yet reliable and robust CVT transmission design.

Even the best CVT just takes motor shaft power and wastes some of it as heat. It's easy enough to size the motor to give you the desired torque across the desired RPM range. Everything you need to add in series after your motor just means you need to re-choose a motor better suited for the applicati...
by liveforphysics
May 21 2022 8:56pm
Forum: Electric Watercraft
Topic: Electric standup jetski build
Replies: 16
Views: 376

Re: Electric standup jetski build

Worked with the ElectroBrapp guys yesterday and got the controller settings dialed in. 6500 rpms, instant power, (in the video it had soft start) and will hit the motors full power of 33ft\lbs of torque. If the motor can reach 6500rpms the impeller will be spinning around 9100rpms. First video I ha...
by liveforphysics
May 20 2022 1:52pm
Forum: EBike Non-hub Motor Drives
Topic: Bizarre, yet reliable and robust CVT transmission design.
Replies: 14
Views: 2730

Re: Bizarre, yet reliable and robust CVT transmission design.

The thing is, I've now done enough days of dyno testing EVs to realize, any/all mass given towards a multi-speed transmission is instead re-applied towards making the motor stator iron and copper and magnets larger, the end result is higher continous power delivery and efficiency, simplicity, longev...
by liveforphysics
May 19 2022 8:21pm
Forum: EBike General Discussion
Topic: Rip out my value stem and crashed
Replies: 12
Views: 245

Re: Rip out my value stem and crashed

I miss Mr Thud too! What a heck of a guy, racer, and great builder.
Character of a guy, I hope to race with him again someday.
by liveforphysics
May 19 2022 7:03pm
Forum: EBike General Discussion
Topic: Rip out my value stem and crashed
Replies: 12
Views: 245

Re: Rip out my value stem and crashed

Wow my friend! That's some first class bruising! Excellent rainbow of skin colors and bruise area.
You're a fun guy, try to keep those wheels rubber-side down for me. :-)
by liveforphysics
May 19 2022 2:10am
Forum: EScooter/EMotorcycle Build Threads
Topic: Electric Roadster
Replies: 167
Views: 14577

Re: Electric Roadster

Beautiful moto builds. Glad you're not hurt from the wreck, bet you're glad you had that scratched up full face on. Great use of the printer to make your molds for CF parts.
by liveforphysics
May 18 2022 5:26pm
Forum: Battery Technology
Topic: Bench Test Results: Molicel P45B - 50A 4500mAh 21700…an extraordinary cell!
Replies: 13
Views: 400

Re: Bench Test Results: Molicel P45B - 50A 4500mAh 21700…an extraordinary cell!

May I ask...what method do you use to discharge cells, measure discharge, and measure shell temperature? For some tests, a pair of BK Precision 8601 Electronic Loads and the temperature sensing described below. For these tests…calibrated West Mountain Radio CBA Pro IV Battery Analyzer modified for ...
by liveforphysics
May 17 2022 11:28pm
Forum: Battery Technology
Topic: Bench Test Results: Molicel P45B - 50A 4500mAh 21700…an extraordinary cell!
Replies: 13
Views: 400

Re: Bench Test Results: Molicel P45B - 50A 4500mAh 21700…an extraordinary cell!

Fantastic impedance, thanks for sharing Mooch. I've always appreciated your work.
by liveforphysics
May 17 2022 12:44am
Forum: Battery Technology
Topic: 107mph go kart on 28S/18P pack of Molicel P26A
Replies: 16
Views: 383

Re: 107mph go kart on 28S/18P pack of Molicel P26A

Nice kart! I see a lot of ET to be dropped in shorter gearing my friend.
by liveforphysics
May 15 2022 6:07pm
Forum: Battery Technology
Topic: 107mph go kart on 28S/18P pack of Molicel P26A
Replies: 16
Views: 383

Re: 107mph go kart on 28S/18P pack of Molicel P26A

Can you share the 60ft, 330ft, and 1/8th?
by liveforphysics
May 14 2022 11:23pm
Forum: Battery Technology
Topic: 107mph go kart on 28S/18P pack of Molicel P26A
Replies: 16
Views: 383

Re: 107mph go kart on 28S/18P pack of Molicel P26A

Possible to show a vid that is visible to non-facebookers?
by liveforphysics
May 14 2022 5:38pm
Forum: EBike Technical
Topic: Vent Hole to let Moisture escape
Replies: 17
Views: 402

Re: Vent Hole to let Moisture escape

I have also sealed the phase cable ends with silicone to avoid that moisture comes inside that way. The sidecovers are sealed with high temp silicone and also the wire channel through the axle is sealed with silicone from both sides. I run the motor quite hot. Thermal foldback is not applied before...
by liveforphysics
May 13 2022 7:49pm
Forum: EBike General Discussion
Topic: new eZip motor
Replies: 8605
Views: 613888

Re: new eZip motor

Not to be nitpicking, but LTO, LFP, are just variations or Lion (lithium ion) batts. LTO can and often does use the same NCM/NCA cathodes, replaces the lithiated graphite of the anode with lithiated titante (TiO2). LFP is it's own cathode replacing NCA/NCM from being in a cell, but uses the same lit...
by liveforphysics
May 13 2022 11:44am
Forum: EBike Technical
Topic: Vent Hole to let Moisture escape
Replies: 17
Views: 402

Re: Vent Hole to let Moisture escape

One more aspect. Gore vents do stop condensed liquid and liquid droplets, but they pass (in or out) humidity preferentially to air (N2 O2), because H2O is a smaller lighter, faster moving and polar vapor molecule. I don't see any risk of the humotor not having plenty of gas exchange no matter the ef...
by liveforphysics
May 13 2022 11:33am
Forum: EBike Technical
Topic: Vent Hole to let Moisture escape
Replies: 17
Views: 402

Re: Vent Hole to let Moisture escape

When I think again about it, I am not sure if it really makes sense. Wouldn't a (sealed) hub motor only suck air+moisture inside when the inside temperature is lower than the outside temperature? Normally the inside temperature would almost always be higher than the ambient temperature. Everything ...
by liveforphysics
May 12 2022 9:55pm
Forum: EBike General Discussion
Topic: new eZip motor
Replies: 8605
Views: 613888

Re: new eZip motor

I was just thinking of how many grins you leave on the table not being able to ride far with such low wh, but since you can now ride 20 miles its probably night and day for you. There are many grins :mrgreen: coming your way Curtis If he stabilizes chaffing from cell relative motion in the assembly...
by liveforphysics
May 11 2022 9:11pm
Forum: EV Business World
Topic: Rivian's hot lunch
Replies: 9
Views: 279

Re: Rivian's hot lunch

When I go to the Rivian site and do the vehicle build, it generally comes out around $86k. If people really get deliveries for that price, I don't think its fair to call it a $100+k vehicle just because people with early deliveries are choosing to resale in attempts to make 150-200% easy profit to a...
by liveforphysics
May 11 2022 5:55pm
Forum: EBike General Discussion
Topic: new eZip motor
Replies: 8605
Views: 613888

Re: new eZip motor

I took some pictures in Paris of a guy on an ebike pulling a custom trailer that had extra ebike packs onboard powering a set of scooter chargers. I love the idea. I like scooter/ebike charge docks too.
by liveforphysics
May 11 2022 2:19pm
Forum: EV Business World
Topic: Rivian's hot lunch
Replies: 9
Views: 279

Re: Rivian's hot lunch

I see a Rivian pickup at least once a day in SoCal. I do see at least a hundred Teslas for each Rivian, but they must have delivered quite a lot of them to see as many as I do.
by liveforphysics
May 11 2022 2:17pm
Forum: Resources & EV Related Parts and Services
Topic: Laser battery processing
Replies: 2
Views: 131

Re: Laser battery processing

I've been really impressed with that style of interconnect for prismatics. Great joint strength that tears the bus bar metal apart trying to remove it (unless you hole-saw from above right on the weld nugget area). :bolt:

That prismatic looks like its got both terminals aluminum, very convenient.
by liveforphysics
May 10 2022 3:52pm
Forum: Electric Watercraft
Topic: Electric standup jetski build
Replies: 16
Views: 376

Re: Electric standup jetski build

Ive made this mistake, its only fixed by making both sides sprockets larger in diameter is the way to make your chain more quiet. The link below shows the effect of tooth count vs chain vibration. It looks like you have room to package 2x the number of teeth at least, doing that will knock out most ...
by liveforphysics
May 09 2022 6:03pm
Forum: General Discussion
Topic: Long time no see!
Replies: 11
Views: 617

Re: Long time no see!

Glad to see you back, sir! I'm glad to report that I've yet to have a single wheel build come back for repair in all these years. Amazing. I have seen a few with my name on the rim tape, but they were pedicab wheels that had been flogged without mercy. Sure would be nice if someone decided to pick ...