Search found 148 matches

by sleepy_tired
Sep 08 2021 2:15am
Forum: Bike Mechanical & Structural
Topic: CF or Glass Fiber over PVC Pipe
Replies: 27
Views: 848

Re: CF or Glass Fiber over PVC Pipe

For glass fiber there is E-glass and S-glass that are commonly used. E-glass was originally designed for electronic applications (PCB boars, etc), hence the name. It is used because it's cheaper. S-glass is a high grade of fiberglass. Stronger then carbon fiber. The advantage to carbon fiber is that...
by sleepy_tired
Sep 04 2021 3:28am
Forum: EBike General Discussion
Topic: Does this make sense? (no chain or belt, pedal operated generator and wires to the rear hub motor)
Replies: 41
Views: 546

Re: Does this make sense? (no chain or belt, pedal operated generator and wires to the rear hub motor)

The only advantage of this sort of setup is if you want infinitely variable transmission. So you can have your ideal cadence regardless of actual bicycle speed. In a theoretical level this would make up for the drive-train losses by improving human efficiency. On a practical level it is nonsense. I ...
by sleepy_tired
Sep 04 2021 3:07am
Forum: Alternative Energy
Topic: Hydrogen storage.....Solid State ??
Replies: 1
Views: 151

Re: Hydrogen storage.....Solid State ??

Looks like bullshit. Do they have anything other then a 3D render? They mention they have 5 patents, but don't say what they are. Say they were derived from some sort of defense program, but doesn't mention what that was. Tried to find more articles on the subject. The whole thing sounds like somebo...
by sleepy_tired
Aug 22 2021 12:47am
Forum: EBike General Discussion
Topic: 1 kW motor : rear G360, GMAC, 9C RH212, Crystalyte H3540 - or front Grin All Axle ?
Replies: 76
Views: 11325

Re: 1 kW motor : rear G360, GMAC, 9C RH212, Crystalyte H3540 - or front Grin All Axle ?

Or do I have to move to 27.5 or 26 inches frame ? In practical terms difference between 29 and 26 is rather unsubstantial. If things are very marginal with 29er then moving to 26 may work slightly better. But that is about it. Is it worth it to replace my GMAC 8T by a 10T ? A large direct drive mot...
by sleepy_tired
Jul 19 2021 9:49pm
Forum: Large EV General Discussion
Topic: Toyota AWD rear E-drive unit, Q211-2FM
Replies: 3
Views: 394

Re: Toyota AWD rear E-drive unit, Q211-2FM

What sort of controller would you use for something like this?
by sleepy_tired
Jun 21 2021 6:40pm
Forum: EBike General Discussion
Topic: Geared Hub vs Mid-Drive?
Replies: 20
Views: 939

Re: Geared Hub vs Mid-Drive?

The problem with geared hub is overheating. Since it's a motor spinning on the inside of the hub it's essentially running inside of a sealed metal box. That means there is no direct path between the motor and the outside and thus cooling is a problem. Electric motors are capable of generating a mass...
by sleepy_tired
Jun 21 2021 4:41pm
Forum: EBike Technical
Topic: Longtail cargo bike project
Replies: 36
Views: 5794

Re: Longtail cargo bike project

It's beautiful
by sleepy_tired
Jun 21 2021 4:20pm
Forum: EBike Technical
Topic: Rohloff Hub: How Much is Too Much Watt-Wise?
Replies: 11
Views: 276

Re: Rohloff Hub: How Much is Too Much Watt-Wise?

If somebody can afford a Rohloff drive they could afford to put two Grin All-axle motors on the front wheels.

That way you have a AWD Trike. If it's got proper 20 inch front wheels then it would essentially make you unstoppable. Could climb a 25% degree slope at 20mph.
by sleepy_tired
Jun 21 2021 4:14pm
Forum: EBike Technical
Topic: 2wd
Replies: 8
Views: 242

Re: 2wd

I would dump the 2 display idea and use a Cycle Analyst v3 and split the throttle signal from that to the controllers. Plug the PAS and throttle sensors into the CAv3.
by sleepy_tired
Jun 21 2021 12:15am
Forum: EBike General Discussion
Topic: The ideal hubmotor
Replies: 20
Views: 808

Re: The ideal hubmotor

The ideal hub motor is a in runner motor on the outside of the hub driving the hub with a chain or gear. Just something very compact and close to the central hub; off of one side. Something like those old brushed gear reduction motors from 20 years ago. Just something modern. That way weight issue i...
by sleepy_tired
Jun 19 2021 10:11pm
Forum: EBike General Discussion
Topic: How many watts do I need?
Replies: 29
Views: 902

Re: How many watts do I need?

Is 1,000 watts a no-brainer if I am willing to accept the added weight and whatever other penalties high wattage brings? 750 watts is 1hp. That is enough to get 25-30mph on flat ground without pedaling. I like to have a 1-2hp bicycle conversions. which is 750-1500watts. It won't stop you from avoid...
by sleepy_tired
Jun 04 2021 8:50pm
Forum: EBike General Discussion
Topic: Why do I now ride my ebike with light motorcycle gear?
Replies: 59
Views: 1451

Re: Why do I now ride my ebike with light motorcycle gear?

My understanding of the subject is that helmets do reduce the chance of significant head injury during a accident significantly. However they slightly increase the chances of neck and spine injury. The downside is that wearing helmets and safety gear actually increases the likelihood of being in a a...
by sleepy_tired
Jun 04 2021 8:11pm
Forum: Bike Mechanical & Structural
Topic: Recommendation for triple chromed fork for 26" bicycle
Replies: 13
Views: 606

Re: Recommendation for triple chromed fork for 26" bicycle

Yeah the Seatle SS 7sp is very similar, but with disk brakes and derailleur. I was looking at recumbents before and the large tires on these bikes are very appealing. I like large tires for their comfort.

Not sure how I feel about having to be stretched out in a half-superman pose, though.
by sleepy_tired
Jun 04 2021 7:34pm
Forum: Bike Mechanical & Structural
Topic: Gas "Generator" <pumping> Electric fast "Charger" via electric bike
Replies: 8
Views: 511

Re: Gas "Generator" <pumping> Electric fast "Charger" via electric bike

I always really liked the idea of using those Meanwell LED drivers for "gorilla charging" of ebikes. As long as you get one of those CC/CV ones that can be adjusted to the right battery voltage/amperage it should be fine. The advantage to them is that they are waterproof, affordable, and d...
by sleepy_tired
Jun 04 2021 7:16pm
Forum: Bike Mechanical & Structural
Topic: Recommendation for triple chromed fork for 26" bicycle
Replies: 13
Views: 606

Re: Recommendation for triple chromed fork for 26" bicycle

Micargi Bronco bikes If you pick a model that is multi-speed then it can have disk brakes. The only two I am aware of, besides their pre-made ebike, is the "Slugo SS 7sp" and "Seatle SS 7sp". I don't know how nice they are. Never owned a Micargi. Thought about it a couple times....
by sleepy_tired
May 31 2021 3:41am
Forum: Battery Technology
Topic: Building a large capacity battery for bicycle trailer
Replies: 94
Views: 2136

Re: Building a large capacity battery for bicycle trailer

are you lying on purpose to make prsmatic look better then they are? Nope. your math is completly broken. you are comparing crappy chinese used cells thst will NEVER reach their rating or lifespan with brand new cyclindricals wich are way too expensive. No, I wasn't comparing "crappy chinese u...
by sleepy_tired
May 31 2021 2:13am
Forum: Vendor Relations Corner
Topic: EM3ev WARNING - abysmal customer support.
Replies: 55
Views: 2274

Re: EM3ev WARNING - Possible exit scam!

This thread reminds me why I am absolutely and 100% happy that I don't have to deal with the general public in my professional life. If you want somebody to hold your hand and concentrate on providing a enhanced brand experience when buying a product then go out and spend your money on a E-bike made...
by sleepy_tired
May 30 2021 11:16pm
Forum: Battery Technology
Topic: Building a large capacity battery for bicycle trailer
Replies: 94
Views: 2136

Re: Building a large capacity battery for bicycle trailer

I think that for this situation lifepo4 is the way to go. Using this as a example: https://www.aliexpress.com/item/33054219276.html 3.2v 100ah Lifepo4 prismatic = 1.98 kg per cell. 16s1p = 16 cells = 31.68kg versus: https://ru.nkon.nl/rechargeable/li-ion/21700-20700-size/samsung-inr21700-30t-3000mah...
by sleepy_tired
May 30 2021 10:40pm
Forum: Battery Technology
Topic: The case for using Supercapacitors with Lithium-Ion batteries in EV's
Replies: 19
Views: 498

Re: The case for using Supercapacitors with Lithium-Ion batteries in EV's

True, but vehicles in this category/usage profile already include similar requirements: user-selectable launch control requires parameters in range, with limited frequency of launches. In this case, a depleted supercap bank could be selectably charged from the traction battery for a launch. It woul...
by sleepy_tired
May 29 2021 3:08am
Forum: Battery Technology
Topic: The case for using Supercapacitors with Lithium-Ion batteries in EV's
Replies: 19
Views: 498

Re: The case for using Supercapacitors with Lithium-Ion batteries in EV's

The problem with naive approach to using capacitors, that is putting the capacitors in parallel with the battery. is that the capacitors are going to be in constant competition with motor for drawing current from the battery. Any time you accelerate and get a voltage drop from the battery you will g...
by sleepy_tired
May 28 2021 3:25pm
Forum: Bike Mechanical & Structural
Topic: Aluminium Triangle Case build, minimal tools?
Replies: 21
Views: 1001

Re: Aluminium Triangle Case build, minimal tools?

Is that rigid HDPE? Yeah. It's the same stuff they make plastic cutting boards out of. If you have a cheap white plastic cutting board in your kitchen it's probably HDPE. They use it to make 1 gallon milk jugs in the USA (not sure elsewhere). It's very tough stuff. I've tried ABS and a couple of di...
by sleepy_tired
May 28 2021 10:18am
Forum: EBike General Discussion
Topic: Gadgets on your eBike that you couldn't live without
Replies: 88
Views: 5660

Re: Gadgets on your eBike that you couldn't live without

I don't see anything wrong with having a very expensive bike. The problem is constantly trying protect it. I remember riding past a expensive bike someone had left locked to street sign post. Evidently that had a problem and planned to retrieve it. A couple of days later the only thing remaining wa...
by sleepy_tired
May 28 2021 3:44am
Forum: EBike General Discussion
Topic: Gadgets on your eBike that you couldn't live without
Replies: 88
Views: 5660

Re: Gadgets on your eBike that you couldn't live without

I don't see anything wrong with having a very expensive bike. Everybody has different tastes and income levels and there isn't anything wrong with that. However if you have to go into debt for your bicycle then that 100% isn't a good thing. Seems like it's more stress then it's worth to have a expen...
by sleepy_tired
May 27 2021 8:56pm
Forum: Bike Mechanical & Structural
Topic: Aluminium Triangle Case build, minimal tools?
Replies: 21
Views: 1001

Re: Aluminium Triangle Case build, minimal tools?

A plastic welding kit is pretty affordable and doesn't require any exotic gasses or anything weird like that . It's nothing more fancy then a heat gun with a tip to focus the heat. People use them for fixing holes in kayaks and such things. If that doesn't sound appealing then you can probably do so...
by sleepy_tired
May 26 2021 7:37pm
Forum: EScooters/EMotorcycles
Topic: More low end torque for up hill climbing power
Replies: 27
Views: 879

Re: More low end torque for up hill climbing power

If so I would need to go bigger to one of the top 3 choices (270A, 350A, 380A)? I would. Just because you can pump 380A through it doesn't mean that you have to. But if you have small controller you don't get that option. More amps means more torque means more heat. That's the way these things work...