Search found 98 matches

by sleepy_tired
Aug 05 2019 7:42pm
Forum: Large EV General Discussion
Topic: bottom line?
Replies: 7
Views: 1846

Re: bottom line?

Samurai has a divorced transfer case. Meaning there is a drive shaft between the transmission and transfer case. Could probably just plumb a big DC motor directly into that. That'll give you a high range and low range. They have a wide selection of rear end ratios to choose from as well as different...
by sleepy_tired
Aug 05 2019 5:04pm
Forum: E-Bike General Discussion
Topic: Hub motor industry dying?
Replies: 270
Views: 17031

Re: Hub motor industry dying?

mines and quarries roads are also graded to the degree possible.. not usually comparable to steep mtn bike and motorcycle off-road trail and trials terrain imo.. You have it backwards. Nothing ebikes do compare to anything the quarry trucks must handle. I suspect the main reason we see companies li...
by sleepy_tired
Aug 05 2019 4:01pm
Forum: E-Bike General Discussion
Topic: Hub motor industry dying?
Replies: 270
Views: 17031

Re: Hub motor industry dying?

trains run on well graded tracks, not usually very steep terrain where gears can have more benefits.. They also pull trains measured that can be measured in miles and can travel in excess of 75mph. The main limitation on the size and speed of trains is braking, not motor power. What about those mon...
by sleepy_tired
Aug 05 2019 3:47pm
Forum: E-Bike General Discussion
Topic: Hub motor industry dying?
Replies: 270
Views: 17031

Re: Hub motor industry dying?

Hubs are still a fantastic option, but it seems like we're close to reaching the limits of how much better they can get without the cost approaching that of a mid drive. A big selling point is still less moving parts = less things to break, and low cost. hub motors aren't going anywhere. From a eng...
by sleepy_tired
Aug 04 2019 10:44am
Forum: E-Bike General Discussion
Topic: Hub motor industry dying?
Replies: 270
Views: 17031

Re: Hub motor industry dying?

Hub motors are not going anywhere. What is needed really boils down to geared hub motors that don't suffer from overheating issues at higher power. This way you get your single speed reduction gear to keep the motor lightweight while still being able to package it nicely into a bicycle form factor. ...
by sleepy_tired
Jul 26 2019 1:07am
Forum: Motor Technology
Topic: Magnax - 98% peak efficient 16kg 200kw peak yokeless axial flux motor
Replies: 13
Views: 1321

Re: Magnax - 98% peak efficient 16kg 200kw peak yokeless axial flux motor

What i think would be the ultimate drive for our ebikes would be a CSIRO pancake motor in a hub wheel, but i hear those things cost tens of thousands of dollars :lol: Absolutely. The wheel itself would be the hub motor. It would end up looking something like those Zipp disc wheels. if you manage to...
by sleepy_tired
Jul 25 2019 9:04pm
Forum: Motor Technology
Topic: Magnax - 98% peak efficient 16kg 200kw peak yokeless axial flux motor
Replies: 13
Views: 1321

Re: Magnax - 98% peak efficient 16kg 200kw peak yokeless axial flux motor

Where are the good, compact reduction units?? Hiding inside of geared hub motors as dual stage planetary reduction gearsets. Kinda sucks when you have fantastically efficient, lightweight, and powerful motor only to double the price and lose all your efficiency gains through a transmission. Single ...
by sleepy_tired
Jul 25 2019 1:54pm
Forum: Motor Technology
Topic: Magnax - 98% peak efficient 16kg 200kw peak yokeless axial flux motor
Replies: 13
Views: 1321

Re: Magnax - 98% peak efficient 16kg 200kw peak yokeless axial flux motor

Am I missing something? I don't think so. The only thing I can think of is that efficiency advantages probably has more to do with power density then range. Since power is related to how much heat the motor can shed. So, ignoring other factors, If a motor type 'X' has a efficiency of 92% and peak o...
by sleepy_tired
Jul 25 2019 12:16pm
Forum: E-Bike General Discussion
Topic: How good are the BikeE recumbent bikes at high power / high speed?
Replies: 30
Views: 1991

Re: How good are the BikeE recumbent bikes at high power / high speed?

I'd imagine the end result would be 50lbs, but the portlyness is forgivable with it being a machine you built yourself.. ! And when you hook up a 1500w++ motor to it the weight probably will be desirable anyways. :) I've looked into doing this stuff before. I've found that if you want disk brakes o...
by sleepy_tired
Jul 25 2019 10:16am
Forum: E-Bike General Discussion
Topic: Do you prefer freewheel or cassettte for your hub motor?
Replies: 22
Views: 1548

Re: Do you prefer freewheel or cassettte for your hub motor?

If you have a bicycle you plan on pedaling then cassettes win hands-down. Just better selection of gearing. Since most people can go faster on a ebike then having a wide range gearing is a big advantage. Sunrace has a wide-range 8 speed that would be very inexpensive to use, 11-40 tooth, for example...
by sleepy_tired
Jul 25 2019 1:56am
Forum: E-Bike General Discussion
Topic: How good are the BikeE recumbent bikes at high power / high speed?
Replies: 30
Views: 1991

Re: How good are the BikeE recumbent bikes at high power / high speed?

Atomic Zombie has a lot of interesting looking kits. I was looking at that one as well, but in the video it seems to bounce like a pogo stick over bumps. I am not sure if that is a actual problem and if it is how to fix it. The nice thing about it is that if you are the type of guy who has a older b...
by sleepy_tired
Jul 24 2019 3:00pm
Forum: E-Bike General Discussion
Topic: How good are the BikeE recumbent bikes at high power / high speed?
Replies: 30
Views: 1991

Re: How good are the BikeE recumbent bikes at high power / high speed?

I figure it's tough to beat upright bicycles for practicality in the city. That limo probably isn't as bad as it seems due to the steep head angle. Most LWB are going to have a very slack head angle due to having to angle the handle bar step towards the rider, which means their frames look shorter d...
by sleepy_tired
Jul 24 2019 2:42pm
Forum: Battery Technology
Topic: best fireproof case/ system or DIY to store/charge lipo liion safest way
Replies: 42
Views: 2121

Re: best fireproof case/ system or DIY to store/charge lipo liion safest way

I really don't see any possibility to eliminate smoke damage. Not unless you are using something that is sealed completely or is vented to the outdoors. If I was running a business I would want to invest in a heavy steel cabinets, but for home gamer I don't see that being likely. The best you can ho...
by sleepy_tired
Jul 24 2019 9:51am
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 5810
Views: 320285

Re: Wind and Solar vs Coal, Gasoline, Nuclear

You are correct that many people don't like paying extra for something they perceive to be no better. I wouldn't count on the free market getting the planet out the mess it got us into. If you destroy the economy you destroy any ability to save the environment. Nuclear is one of the most expensive ...
by sleepy_tired
Jul 24 2019 12:46am
Forum: E-Bike General Discussion
Topic: How good are the BikeE recumbent bikes at high power / high speed?
Replies: 30
Views: 1991

Re: How good are the BikeE recumbent bikes at high power / high speed?

To bad LWB isn't going to work for you. Seems like a good match for the heavy use of regenerative braking. There are Linear-brand LWB bikes that do fold. They have been made by a few different companies that have been bought and sold for a while now. So you can find used ones pretty easily. https://...
by sleepy_tired
Jul 23 2019 11:11am
Forum: Battery Technology
Topic: best fireproof case/ system or DIY to store/charge lipo liion safest way
Replies: 42
Views: 2121

Re: best fireproof case/ system or DIY to store/charge lipo liion safest way

Cell fusing is not a solution , Of course it's a solution to something. What you think it's not a solution to is a bit of a mystery to me. It disconnects a cell when it becomes internally shorted. That way the pack doesn't try to discharge through the bad cell. The Ligo battery is just 100 Wh..most...
by sleepy_tired
Jul 23 2019 5:24am
Forum: Battery Technology
Topic: best fireproof case/ system or DIY to store/charge lipo liion safest way
Replies: 42
Views: 2121

Re: best fireproof case/ system or DIY to store/charge lipo liion safest way

Probably the safest bet, besides just charging outside, would be to buy a battery potted in epoxy with a fiberglass reinforced case. https://www.youtube.com/watch?v=oBlac5gWLfI https://www.ebikes.ca/product-info/ligo-batteries.html Or maybe this guy: https://lunacycle.com/luna-wolf-v2-52v-battery-pa...
by sleepy_tired
Jul 23 2019 12:56am
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 5810
Views: 320285

Re: Wind and Solar vs Coal, Gasoline, Nuclear

For solar and/or nuclear and/or other alternatives to replace petroleum products they are going to need to complete on price. They are just going to need to put coal/petroleum industry out of business just because they are better. When did "better" exclusively mean "cheaper"? In a properly operatin...
by sleepy_tired
Jul 22 2019 11:59am
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 5810
Views: 320285

Re: Wind and Solar vs Coal, Gasoline, Nuclear

And liquid fuel, on which all the big projects and food production of current civilization that has grown to 7.6 billion, will be leaving us soon. 'Soon' in terms of geological sense of time, but chances are we have another 200 years at the current growing rate before we really start to hit a decli...
by sleepy_tired
Jul 22 2019 2:59am
Forum: Battery Technology
Topic: amunition case fire case bags
Replies: 14
Views: 850

Re: amunition case fire case bags

Proper military-style ammo cases are sealed, but I don't know about the generic ones you might pick up in a store. They are intended to preserve ammunition and it's important to keep moisture out for that to happen. There will be a rubber seal at the top that gets compressed down tightly by the hand...
by sleepy_tired
Jul 10 2019 1:59pm
Forum: Battery Technology
Topic: which battery type is best?
Replies: 16
Views: 1060

Re: which battery type is best?

When comparing to 18650 you have to take into account that 18650 comes in lots of different chemistries. Some come in just regular Lithium-Colbalt like Lipos, but others come in different chemistries with different properties. So you have to look at specific cells, the ratings, and what chemistry th...
by sleepy_tired
Jul 02 2019 12:01pm
Forum: Large EV General Discussion
Topic: 300hp single seat off road buggy project
Replies: 49
Views: 9353

Re: 300hp single seat off road buggy project

I've looked at this sort of thing before and I ran into the 'powerglide solution'. Powerglide can be ran without a torque converter. You can use a pump to provide the hydraulic pressure necessary to operate the internal clutch packs. I don't know the details on how to do this, though. No real clue. ...