Search found 13834 matches

by liveforphysics
Sep 25 2022 3:42am
Forum: EScooters/EMotorcycles
Topic: Sur-Ron - New Mid drive Bike
Replies: 5771
Views: 734429

Re: Sur-Ron - New Mid drive Bike

Been a while since I’ve posted here, I bought my SurRon in 2018 after the initial rave reviews I read about here on ES and have never stopped mod’ing it, the only things I’ve left stock are some covers and trim, belt tensioner and the frame. 4ED99FAC-C69C-45C0-AECD-8BC8642C6F6E.jpeg 000AB8E4-50EA-4...
by liveforphysics
Sep 25 2022 1:37am
Forum: Items for Sale - New
Topic: 160 KW 72v Cntroller QS/Yuma 15KW 300A BMS
Replies: 72
Views: 5176

Re: 160 KW 72v Cntroller QS/Yuma 15KW 300A BMS

Site, twitter, and facebook for this guy is still all gone, over three weeks after I checked above. Am guessing at this point anybody that paid for stuff they didn't get yet probably isn't going to. Why, who knows? Probably we'll never find out. :( I bought the 2400Amp fardriver controller and paid...
by liveforphysics
Sep 23 2022 1:35pm
Forum: Battery Technology
Topic: Why the BMS Doesn't Work as You Believe
Replies: 9
Views: 165

Re: Why the BMS Doesn't Work as You Believe

Cheeze- I'm afraid you're badly confused. The purpose of a BMS is to permit the pack to fail gracefully by preventing recharging in the event of an issue arising over the vehicle's lifespan.

Without that functionality, it would be a non-starter to ship products with rechargeable lithium packs.
by liveforphysics
Sep 19 2022 6:38pm
Forum: EBike Technical
Topic: Which end terminal battery solder is better?
Replies: 6
Views: 160

Re: Which end terminal battery solder is better?

Whatever thermal damage that may have occurred has already happened. Watch for abnormal self-discharge behavior from that cell group for a few days with no BMS attached.
by liveforphysics
Sep 18 2022 12:03pm
Forum: EScooter/EMotorcycle Build Threads
Topic: Yamaha YZ250F
Replies: 462
Views: 39379

Re: Yamaha YZ250F

I would be shocked if he wasn't pre-heating his pack before the drag race. It helps too much not to do it.

Somehow he really ran a blazing ET and trap speed, and not possible to do that without making a LOT of mechanical shaft power.
by liveforphysics
Sep 16 2022 7:28pm
Forum: EScooter/EMotorcycle Build Threads
Topic: Yamaha YZ250F
Replies: 462
Views: 39379

Re: Yamaha YZ250F

That drag bike looks legit to me. 125mph trap speed and 10.4 1/4mile takes real horsepower to do, that's faster than my 180hp GSXR-1000's fastest ET.
by liveforphysics
Sep 16 2022 1:33pm
Forum: EBike General Discussion
Topic: King of the e-Mountain bike throwdown!
Replies: 9
Views: 318

Re: King of the e-Mountain bike throwdown!

I twice blacked out on my pedal road bike and woke up scratched up on the ground attempting to get the KOM for the long steep hill I once lived near the top of. I was still >30seconds off the time. A competitive cyclist stopped by to visit and borrowed my own pedal road bike without clipping in (my ...
by liveforphysics
Sep 16 2022 1:22pm
Forum: EBike General Discussion
Topic: King of the e-Mountain bike throwdown!
Replies: 9
Views: 318

Re: King of the e-Mountain bike throwdown!

Most runs seem to have under 5-10sec where the rider is intentionally adding power to the bicycle. The great majority of time is hugging the brakes while trying to ride the big terrain obstacles like a pump track with your body and the bicycle in a weight transfer dance to not be bucked off. This is...
by liveforphysics
Sep 16 2022 12:45pm
Forum: EBike General Discussion
Topic: King of the e-Mountain bike throwdown!
Replies: 9
Views: 318

Re: King of the e-Mountain bike throwdown!

For the off road trails I like to ride, having a light weight and well balanced and tuned suspension ebike is definitely your fastest option through them, regardless of the power level the vehicle has. Even on an asphalt smooth and flat kart track, I was beaten by PaulD riding an ebike with 2-3kW pe...
by liveforphysics
Sep 16 2022 11:53am
Forum: Battery Technology
Topic: Thread for new battery breakthrough PR releases
Replies: 1857
Views: 298775

Re: Thread for new battery breakthrough PR releases

Some news from ADDEN on the "solid state" proto - (fund raising?) claims. 82% @ 20,000 cycles and 10C charge ! :shock: 110.6 kW/kg, with an energy density up to 631.1 Wh/kg. capacities. Interesting times. :) https://www.autoevolution.com/news/harvard-engineers-invent-a-solid-state-battery...
by liveforphysics
Sep 12 2022 12:42am
Forum: Battery Technology
Topic: Thread for new battery breakthrough PR releases
Replies: 1857
Views: 298775

Re: Thread for new battery breakthrough PR releases

They don't get Adam Savage, because they hire me instead to find out for them with precise temperature control fixtures and 7.5digit instrumentation and up to +-2,000Amp cycling. After checking electrical performance, you must access safety performance behavior. For this we load them into the therm...
by liveforphysics
Sep 05 2022 11:50pm
Forum: EScooter/EMotorcycle Build Threads
Topic: Yamaha YZ250F
Replies: 462
Views: 39379

Re: Yamaha YZ250F

Fantastic racing! Great job at making your own bike and kicking ass with it!!! Woot!!!

What a terrific accomplishment to build and race your own powertrain!

-Luke
by liveforphysics
Aug 29 2022 6:57pm
Forum: Items for Sale - New
Topic: 2022 Sur Ron Storm Bee (US)
Replies: 2
Views: 704

Re: 2022 Sur Ron Storm Bee (US)

On that topic, I'm seeing 46hp as being more than 30hp, but having dyno'd many sur Ron's, they are not making over about 26hp out no matter what they feed it.
by liveforphysics
Aug 27 2022 12:01am
Forum: EScooters/EMotorcycles
Topic: 170mph EV Land Speed Motorcycle
Replies: 70
Views: 3514

Re: 170mph EV Land Speed Motorcycle

Luke, one of the problems is availability of good pouch cells. At least I've been unable to find them (other than drag race cells which have very high specific power but limited energy). If you have any leads I'd much rather run those but when I started searching a year ago there wasn't a whole lot...
by liveforphysics
Aug 20 2022 1:54pm
Forum: EScooters/EMotorcycles
Topic: 170mph EV Land Speed Motorcycle
Replies: 70
Views: 3514

Re: 170mph EV Land Speed Motorcycle

If you're after horsepower for a just a couple minutes, using a cylinder cell over a pouch means you're going to either make less than half the HP of the same weight in pouches, or you carry more than 2x the cell mass to have similar HP (but then you have more than double the riding range.)
by liveforphysics
Aug 19 2022 4:22pm
Forum: EScooters/EMotorcycles
Topic: 170mph EV Land Speed Motorcycle
Replies: 70
Views: 3514

Re: 170mph EV Land Speed Motorcycle

Thanks guys. That was a 96S4P pack and the bike now has a 50S pack of Enerdels in it. I'm building a 60S pack of 21700's for it as the Enerdels are getting a bit long in the tooth. Actually, there's only one module getting weak but the 2170's are lighter and will have more capacity (the bike is str...
by liveforphysics
Aug 18 2022 5:10pm
Forum: EScooters/EMotorcycles
Topic: 170mph EV Land Speed Motorcycle
Replies: 70
Views: 3514

Re: 170mph EV Land Speed Motorcycle

Awesome bike Frank! Congratulations on your work!
by liveforphysics
Aug 16 2022 11:50am
Forum: EScooter/EMotorcycle Build Threads
Topic: Suzuki GSX-R e899 K2
Replies: 529
Views: 99449

Re: Suzuki GSX-R e899 K2

The images of your hobby packs looks like it experienced an electrical arc discharge, but didn't experience cell thermal runaway.

That was a fortunate blessing to get one without the other.
by liveforphysics
Aug 15 2022 3:12pm
Forum: EScooters/EMotorcycles
Topic: 170mph EV Land Speed Motorcycle
Replies: 70
Views: 3514

Re: 170mph EV Land Speed Motorcycle

https://insideevs.com/news/595497/tesla ... d-216-mph/

It says a lucid did 235mph in 2017.

But it wasn't done on the extremely difficult surface of salt.
by liveforphysics
Aug 11 2022 2:14am
Forum: EScooter/EMotorcycle Build Threads
Topic: Suzuki GSX-R e899 K2
Replies: 529
Views: 99449

Re: Suzuki GSX-R e899 K2

If your motor isn't overheating, run more than 35% field weakening. I haven't ran less than 50% on anything I've done in the last decade. It hurts nothing on your low speed torque, but gives a massive top end boost. More packs in series of course also gets the same things done, and gives you higher ...
by liveforphysics
Aug 10 2022 8:42pm
Forum: Motor Technology
Topic: 20Kw motor and 300A ESC (ultralight aircraft propulsion system)
Replies: 126
Views: 8870

Re: 20Kw motor and 300A ESC (ultralight aircraft propulsion system)

Absolutely beautiful! I am in awe of your skills and admire your bravery flying a home built motor and controller. Did you build the plane too? :bigthumb: :bigthumb: Please be careful when in the air. We've recently lost one of our forum geniuses here due to an electric powered ultralight crash. Ju...
by liveforphysics
Aug 07 2022 2:41pm
Forum: EBike General Discussion
Topic: Science of cycling still largely mysterious. No one knows why bikes stay upright
Replies: 20
Views: 1054

Re: Science of cycling still largely mysterious. No one knows why bikes stay upright

Training an algorythm is a working knowledge, which is undiminished by having 0% understanding of how it works. I've seen enough videos of bears and primates riding bicycles or motorcycles with effective control. I doubt the guy teaching them starts with equations about gyroscopes and center of grav...
by liveforphysics
Aug 06 2022 10:49pm
Forum: Motor Technology
Topic: Iron Nitride magnets, maybe better than neo's
Replies: 24
Views: 1056

Re: Iron Nitride magnets, maybe better than neo's

I agree Spinning, it would let some very low mass high performance drivers to be made.
Blessings for stronger magnets.
by liveforphysics
Aug 05 2022 6:29pm
Forum: Motor Technology
Topic: Iron Nitride magnets, maybe better than neo's
Replies: 24
Views: 1056

Re: Iron Nitride magnets, maybe better than neo's

He isn't hassling me any, I love him and his awesome memory.

Switched reluctance is great for many uses.

No replacement for PMs when torque density matters most though.
by liveforphysics
Aug 05 2022 4:58pm
Forum: Motor Technology
Topic: Iron Nitride magnets, maybe better than neo's
Replies: 24
Views: 1056

Re: Iron Nitride magnets, maybe better than neo's

Switched reluctance, even in the clever horse-shoe short path flux linking designs are awesome, but a rotor weight penalty. They are also super inconvenient to the point of not making sense to do in outrunner configurations. Any PM material that gives you more rotor surface flux is going to let outr...