Search found 380 matches

by thunderstorm80
Nov 16 2018 5:38pm
Forum: E-Bike Technical
Topic: A portable gasoline generator for long range
Replies: 50
Views: 4150

Re: A portable gasoline generator for long range

I'm not suggesting that a push trailer is the solution for this project, but they do exist: https://endless-sphere.com/forums/viewtopic.php?f=3&t=9855 A hub-motor like this will have a hard time pushing a fully loaded touring bike on it's own due to lack of traction, but if it's an additional motor...
by thunderstorm80
Nov 16 2018 5:29pm
Forum: E-Bike Technical
Topic: A portable gasoline generator for long range
Replies: 50
Views: 4150

Re: A portable gasoline generator for long range

Do you know of a small generator (that can produce about 700W) so that it won't be so heavy? For that you don't want a generator. You want a direct drive gas engine, geared for cruising speed (i.e. 25mph.) If you have a DD hub motor you already have a generator. You might consider a pusher trailer ...
by thunderstorm80
Nov 16 2018 5:23pm
Forum: E-Bike Technical
Topic: Why do Fat-tires have higher rolling resistance?
Replies: 27
Views: 2251

Re: Why do Fat-tires have higher rolling resistance?

Tire shock attenuation is too complex for easy analysis. Suffice it to say that in the same way a 1.9" tire at 65 psi can be an overall harder ride, but still better when bad stuff happens compared to say, a 1" tire at 100 psi; a big ole fat 3-4" tire when "overinflated" to 20-35 psi can be uncompl...
by thunderstorm80
Nov 16 2018 7:06am
Forum: E-Bike Technical
Topic: A portable gasoline generator for long range
Replies: 50
Views: 4150

A portable gasoline generator for long range

Hi, For short rides without pedaling, or long ones where you do most of the pedal work at slow speeds - the current Lithium batteries are enough. But for very long ranges, or if you want to be able to cover a huge distance as a commuting route and do it fast (like 40-50kph), batteries are not enough...
by thunderstorm80
Nov 12 2018 2:56pm
Forum: E-Bike Technical
Topic: Why do Fat-tires have higher rolling resistance?
Replies: 27
Views: 2251

Re: Why do Fat-tires have higher rolling resistance?

Wow... must say I learned a lot from this thread! I still think, and correct me if I am wrong, that fatty tires are the only reliable option for "full" suspension (albeit without the damper) when you tour with a heavy loaded bike - both front panniers and rear. Full suspension bikes just can't handl...
by thunderstorm80
Nov 08 2018 7:41am
Forum: E-Bike Technical
Topic: What's the best E-bike bicycle type for touring+camping?
Replies: 2
Views: 478

Re: What's the best E-bike bicycle type for touring+camping?

What do you think? Would you go with the Fat-Bike, or the Touring-Bike? Touring frames generally are longer wheelbase, for heavy-loaded stability and pannier/heal clearance, plus they have all the braze-on mounts for racks, bottles, mudguards. You want all these things if you're touring. Lots of to...
by thunderstorm80
Nov 08 2018 7:34am
Forum: E-Bike Technical
Topic: Why do Fat-tires have higher rolling resistance?
Replies: 27
Views: 2251

Re: Why do Fat-tires have higher rolling resistance?

Scrub within the contact patch is another source of rolling resistance, and fatbike tires have lots of it. When you take a toroidal tire and make it conform to a flat surface, different locations within the contact patch must move around to reconcile the differences. You can hear it happening with ...
by thunderstorm80
Nov 08 2018 7:26am
Forum: E-Bike Technical
Topic: Why do Fat-tires have higher rolling resistance?
Replies: 27
Views: 2251

Re: Why do Fat-tires have higher rolling resistance?

Steady state?? Are we talking scientific lab tests, or reality? Steady state, you want a track bike, on the velodrome, wearing lycr... I said that so we can neglect the rotational mass differences: I wanted to focus on the differences when you ride at constant speed. When you also talk about accele...
by thunderstorm80
Nov 08 2018 3:02am
Forum: E-Bike Technical
Topic: Why do Fat-tires have higher rolling resistance?
Replies: 27
Views: 2251

Why do Fat-tires have higher rolling resistance?

Let's compare two tires - one 28x2inch wide and the second 26x4inch wide. (so both would have more or less same circumference and so we can take the circumference out of the discussion) Let's also assume that both tires are made from the same compounds and have the same thread pattern for road. The ...
by thunderstorm80
Nov 07 2018 6:19am
Forum: E-Bike Technical
Topic: What's the best E-bike bicycle type for touring+camping?
Replies: 2
Views: 478

What's the best E-bike bicycle type for touring+camping?

Hi, I have two ready E-bikes and I wonder which one should be better for long distance touring trip. I want to discuss it from several points of view: Mechanical longevity (mostly from vibrations and road shocks to the motor, battery, and the cargo), how easy it is to source parts, frame geometry, a...
by thunderstorm80
Jun 24 2018 7:26am
Forum: E-Bike Technical
Topic: Using bicycle's frame as heatsink for the Phaserunner
Replies: 45
Views: 5717

Re: Using bicycle's frame as heatsink for the Phaserunner

What is your opinion about this? Something I'd resort to if other options ... like a wind-facing heat sink augmented with a thermostatically controlled fan ... wouldn't work. If you consider the water you need to carry, I'm not sure you could call this light weight. This looks improvised, and it is...
by thunderstorm80
Jun 23 2018 8:29am
Forum: Battery Technology
Topic: My theory of how to max-out the lifecycle of Li-Ion batteries
Replies: 14
Views: 1101

Re: My theory of how to max-out the lifecycle of Li-Ion batteries

spinningmagnets wrote:
Jun 22 2018 12:12pm
Here's some more information along these lines of study...https://www.electricbike.com/how-to-mak ... tery-last/
The link you sent to, is broken... :?
by thunderstorm80
Jun 23 2018 8:28am
Forum: Battery Technology
Topic: My theory of how to max-out the lifecycle of Li-Ion batteries
Replies: 14
Views: 1101

Re: My theory of how to max-out the lifecycle of Li-Ion batteries

For example, at the very beginning of charging an empty battery, the IR (Internal Resistance) for charging should be lower than the spec's IR, and so even huge surge of continuous regen currents wouldn't harm it. At the very beginning of charging an empty battery it will tend to be cold, and theref...
by thunderstorm80
Jun 23 2018 5:59am
Forum: General Discussion
Topic: Adding pictures?
Replies: 189
Views: 383844

Re: Adding pictures?

Dunno if this has been asked before: I understand the 512KB limit for saving resources, but, almost all sites nowadays (even apps like Whatspp/Facebook) automatically reduce the file size to what they need before uploading. The CPU need for that is almost nothing compared with the CPU's of today, ev...
by thunderstorm80
Jun 21 2018 11:34am
Forum: Items for Sale - Used
Topic: Israel - Rear geared motor laced with rim and tire (27.5in)- eZee (ezee250rc) with modern cassette hub - 550$
Replies: 0
Views: 331

Israel - Rear geared motor laced with rim and tire (27.5in)- eZee (ezee250rc) with modern cassette hub - 550$

I bought it from Grin. This is the motor: http://www.ebikes.ca/shop/electric-bicycle-parts/motors/mezee250rc.html Laced with Velocity Cliffhanger rim (80$ high quality rim) which has 25mm internal width and 27.5inch diameter. (ETRTO 25-584) It comes with a 180mm disc rotor and a torque arm. (the tor...
by thunderstorm80
Jun 21 2018 9:14am
Forum: Battery Technology
Topic: My theory of how to max-out the lifecycle of Li-Ion batteries
Replies: 14
Views: 1101

My theory of how to max-out the lifecycle of Li-Ion batteries

Hi, Now that I start working with mortal Li-Ion batteries (non A123's - My 7 year old A123 has lost only 20% of it's capacity, but sadly they are not available anymore genuinely), I have learned a lot about them and how you can greatly increase your life-cycle. (not just the known rule to top-up to ...
by thunderstorm80
Jun 21 2018 8:57am
Forum: E-Bike Technical
Topic: Using bicycle's frame as heatsink for the Phaserunner
Replies: 45
Views: 5717

Re: Using bicycle's frame as heatsink for the Phaserunner

I finally came up with a brillinat yet simple coolding method. It involves cooling the PR (Phaserunner) using simple water evaporative cooling, by using wrapped wet cloth. You can see some pictures at the bottom of this message. First, the PR is not directly secured to the top-tube but has about 1cm...
by thunderstorm80
May 23 2018 2:33am
Forum: Battery Technology
Topic: Before paying 2000$ to Osnpower - Can I ask your opinion?
Replies: 15
Views: 1444

Re: Before paying 2000$ to Osnpower - Can I ask your opinion?

Why don't you just buy a couple of cells, ask them to send via express and check for yourself? Sure it is an added cost, but I think it's quite nothing compared to 2000 USD. Based on the info they provided you it seems legit. For some reason I don't know, those batteries seems to be easy to find he...
by thunderstorm80
May 21 2018 11:46pm
Forum: E-Bike General Discussion
Topic: Any suggestions for reliable battery supplier?
Replies: 14
Views: 1270

Re: Any suggestions for reliable battery supplier?

So far and from what I know, I would 100% trust the 2 following stores:
www.ebikes.ca

https://em3ev.com/

Good luck :)
by thunderstorm80
May 21 2018 2:42pm
Forum: Battery Technology
Topic: Before paying 2000$ to Osnpower - Can I ask your opinion?
Replies: 15
Views: 1444

Re: Before paying 2000$ to Osnpower - Can I ask your opinion?

Well, now I am even more confused.
Are you telling me that on the latest pics I've uploaded, where they show what they have in stock now (with the A1) - are authentic but 7 year old cells?
And why do they have to weld the tabs? What is the other (and better) option for assembling the tabs?
by thunderstorm80
May 21 2018 11:25am
Forum: Battery Technology
Topic: Before paying 2000$ to Osnpower - Can I ask your opinion?
Replies: 15
Views: 1444

Re: Before paying 2000$ to Osnpower - Can I ask your opinion?

I got another response from OSN, after requesting a modern picture. This is what I got: A123 20AH.jpg 26650.png The 20Ah seems legit pic, but what about the product? Why does it says A1 on the pouch's body? (seems like partly printed "A123") Does anyone can vouch for those cells? The second picture ...
by thunderstorm80
May 20 2018 10:58am
Forum: Battery Technology
Topic: Before paying 2000$ to Osnpower - Can I ask your opinion?
Replies: 15
Views: 1444

Re: Before paying 2000$ to Osnpower - Can I ask your opinion?

Hey. Following your recommendations I have asked for pictures. They said they can't send pictures of the 26650 pack because they build it for me once I make an order. (they have the individual cells). For the 20Ah I got this picture: IMG_1770.jpg It looks legit, but then I noticed that this is a pic...
by thunderstorm80
May 18 2018 8:13am
Forum: Battery Technology
Topic: Before paying 2000$ to Osnpower - Can I ask your opinion?
Replies: 15
Views: 1444

Before paying 2000$ to Osnpower - Can I ask your opinion?

Hi, After being very happy with my 26650 A123 cells (lost only 20% in 7 years and still goes under heavy usage) and my A123 20Ah prismatic cell's performance, I am about to buy some more cells for my future builds. My current A123 20Ah cells are C grade cells - with 18Ah capacity and short tabs. I'v...
by thunderstorm80
May 03 2018 6:08am
Forum: E-Bike General Discussion
Topic: Where to get -FULL- Fat-Bike fenders?
Replies: 3
Views: 466

Re: Where to get -FULL- Fat-Bike fenders?

They don't seem to have any holes/hangers for mounting them to the standard eyelets on the frame, or am I wrong?
by thunderstorm80
May 03 2018 2:43am
Forum: E-Bike General Discussion
Topic: Where to get -FULL- Fat-Bike fenders?
Replies: 3
Views: 466

Where to get -FULL- Fat-Bike fenders?

Hi, I am looking for full cover fenders, not short one which are just "boards" or "wings" and doesn't actually prevent water from being splashed towards your legs and into the triangle area of the frame. Something like this: https://classic-cycle.com/all/488/fat-bike-plastic-fender-set-26-x-4.0-4.8-...