Endless Sphere

Karts are an aerodynamic brick !...anything above 30mph pumps power into the wind.
You could reduce that time, and increase top speed if you just tilted the seat back to a “laydown” position.

john61ct wrote: ↑

May 16 2022 7:42am

Big cargo bike designed for climbing mountain roads with 500+ lb loads, they'd be just fine

Sure , they would work, ....but EV cells would be save a lot of extra weight.

Trade the 308 in and buy a Prius ...!

I hope you aren't trying to say there's anything wrong with Winstons / Thundersky? There is nothing “wrong” with flooded lead acid either,...for some applications ... such as car starter battery. Its a “horses for courses” situation ! But, Winstons or Thundersky in the context of ebikes, .. they ar...

Good news !
How are you dealing with chain play now, without thr excentric adjustment !

I haven't heard why investors are avoiding Rivian right now. Maybe a weak quarterly report? Ford selling off their major shareholding in Rivian , probably did not help ! Several for sale right now... if you have the money. https://www.cars.com/shopping/results/?makes[]=rivian Most reviews I've seen...

.note the wall thickness around the bottom bracket cannot be over 8mm (only an issue on some custom or carbon booms),... From that statement, it looks like you would need a customised excentric sleeve, ( maximum offset, ) to get the Tsdz2 spindle as close as possible ..3mm or less.. to the bb shell...

At last it is alive and taking orders..

https://www.vergemotorcycles.com/

For the people saying 100v DC is still quite dangerous, maybe you're right. Does anyone here think 48v DC would be low enough to be considered safe when accidental contact happens? Of course wiring a house exclusively for 48v would use much more copper than currently, maybe prohibitively so. Some c...

.My Ant bms/battery only charges to 4.158 per cell. Any tips on getting it to charge up to the full 4.20v per cell? 20s2p SPIM08HP battery..... Seriously ?..why ? There will be no noticeable change in performance from that 0.8 volt increase of pack voltage,..but you will likely seriously reduce the...

Most of the stock trolling motors are designed around a “ trolling” spec use. That means they are optimised for low speed use on mono hull fishing boats, often with compromised “weed release” prop designs People do use them for other uses, but to get the best efficiency/ speed for something like a s...

Perhaps you need to see an eye doctor. Could it be that you’re color blind not only to green , but also to red (DDs red-letter comments). You never responded to portions of his post directed to your comment(s). We obviously have a terminology/ language problem here There was nothing in DDs red comm...

AW, Did you watch the video ?
.. that was much more than an electrical/ ancilliary fire !
It went off like a truck full of ammunition !

eMark wrote: ↑

May 04 2022 9:45am

Apparently a lipo pouch cell battery offers no avantage for an e=bike DIY build ?

??.. how many have you built ?
I can think of several advantages of pouch cells for ebikes.

Ahh !... Hamilton Vic. Thats a little outside my morning constitutional !..sorry.
But if you cannot get the battery to function,..can you find an alternative battery/ voltage source , you could hook up to test the controller and motor.?

You need to be realistic and aware of retail pricing for similar cells....<$200/kWh...pre assembled, with warranty.
https://signaturesolar.com/eg4-8-cell-p ... -6v-100ah/

Never mind 7 m wide....how deep was it ? Assume you have removed and dried the battery ? Some electrical fault tracing skills are needed. That should be easy to check with a MMeter etc to see if it is still charging or a fuse is blown. Most likely you have drowned the controller in the base of the b...

.Is my figuring improving ? No ! You are still thinking that cell capacity and voltage have a linear relationship ( straight line graph)... when they dont. And you dont seem to read replies . Why dont you just stick to using the data from Molicel ? Your 14s 9p example would have 1,953 Wh ( 126 cell...

Thanks for the link AW.. Yes there are many ways for an EV fire to start, but Bollore specificly state these cells will not burn and are immune from thermal runaway. I think that video suggests otherwise. Incidentally, 2 more similar buses have also burned in Paris since the one in the video, and th...

Using Molicel’s data from their spec sheet, each cell has a “typical” capacity of 15.5 Wh. So a pack using 196 cells ( of any configuration ) will have ..15.5 x 196 = 3038 Wh (3.038 kWh) BUT, the usable capacity will depend on what charge voltage is used , and what LVC is set . And at $980 cost, is ...

machanic wrote: ↑

May 02 2022 4:13pm

Not stripped, almost non-existent the hole is too large for the tap so threads are shallow. ....

Thats most likely because they are at the bottom of a “blind” tapped hole where the end threads on the tap would be tapered off.

A recent spate of electric bus fires in Paris, Europe, has brought to attention the battery tech used on those vehicles. https://www.lemonde.fr/en/france/article/2022/04/29/paris-suspends-electric-bus-fleet-after-two-fires_5981956_7.html The vehicles are made by “Blue Bus” by the Bollore company and...

....... Shouldn't the nominal (50%) pack voltage for both be the same -- 3.60V .. ....Can we agree on 3.600V as nominal voltage for figuring Wh(and kWh) . No, ..that would only be correct if the voltage to capacity relationship is linear, and the same with different discharge loads.....which it is ...

if only it were true !

calab wrote: ↑

May 01 2022 8:40pm

Opt for fake plants in your front and back gardens.

Or just rock it all

You do know that all plants adsorb CO2 ?
Fake ones generate CO2 during manufacture !