Search found 186 matches

by Bullfrog
Mar 28 2020 6:48pm
Forum: E-Bike Technical
Topic: 12T MAC motor and high current
Replies: 30
Views: 5530

Re: 12T MAC motor and high current

My experience...running a 12T MAC, 14s5p battery, 40A Infineon 12 FET 3077 controller in a 29" wheel with a Maxxis Hookworm tire. Most hills are not a problem and the top speed is about 25 mph. I weigh 200 lbs and the bike weighs 65 lbs for a total of 265 lbs. You can go to a smaller wheel/tire and ...
by Bullfrog
Mar 27 2020 7:01pm
Forum: E-Bike General Discussion
Topic: Ebike kit advice.
Replies: 10
Views: 382

Re: Ebike kit advice.

IMO Markz has the best ideas. Buy everything from one vendor. I have had great results with everything I have bought from EM3ev. Customer service is a little slow to respond but reliable and they stand behind everything. Best batteries around IMO. I personally would go with a 10T MAC, a 12 FET 3077 ...
by Bullfrog
Mar 27 2020 10:53am
Forum: Items for Sale - New
Topic: Sur-Ron - Belt upgrade KIT
Replies: 106
Views: 14836

Re: Sur-Ron - Belt upgrade KIT

No clue what the squeal is but I don't think it is drivetrain related because the tone doesn't change with the speed.

Wild guess...I'd say it is something electrical/electronic that is resonating.
by Bullfrog
Mar 25 2020 11:15am
Forum: E-Bike General Discussion
Topic: Recommend a motor superior to the..
Replies: 20
Views: 1253

Re: Recommend a motor superior to the..

john61ct wrote:
Mar 25 2020 10:09am
French thread is 1.366" x 25.4tpi (34.7 x 1mm)

https://www.sheldonbrown.com/freewheels.html
That is it...Thanks john61ct :D .
by Bullfrog
Mar 24 2020 1:02pm
Forum: E-Bike General Discussion
Topic: Set a World Record
Replies: 22
Views: 802

Re: Set a World Record

I doubt light weight is important as an absolute HP per kg as a relative measure, yes Given infinite distance to accelerate, weight would not be a consideration as far as the power required to accelerate it. Like everything it depends...for the East Coast Timing Association runs are one mile in len...
by Bullfrog
Mar 24 2020 10:54am
Forum: E-Bike General Discussion
Topic: Recommend a motor superior to the..
Replies: 20
Views: 1253

Re: Recommend a motor superior to the..

I don't have one so I can't measure it. Just read about it on one of the threads here on Endless Sphere. Getting old so I can't remember exact diameter/pitch but it is not 1.375x24 tpi which is the "most" common for currently available freewheels. You can probably find freewheels to fit the 5KW MXUS...
by Bullfrog
Mar 24 2020 10:46am
Forum: E-Bike General Discussion
Topic: Set a World Record
Replies: 22
Views: 802

Re: Set a World Record

What if you repurposed a hub motor as a mid-drive? I've seen pics of this but that would give you some gearing flexibility. Excellent idea and one I may attempt if I continue. I am looking at all the options at this point...I have an old motorcycle with no motor that I may use for the concept :D .
by Bullfrog
Mar 24 2020 10:16am
Forum: E-Bike General Discussion
Topic: Set a World Record
Replies: 22
Views: 802

Re: Set a World Record

Yes but the classes are based on the voltage. The lowest voltage class is currently 0-52.8v so with 52.8v and a Kv of about 19 which is roughly the highest you can get and a 750 mm OD tire which is way bigger than most motorcycle tires that are speed rated (another consideration) you can't go over a...
by Bullfrog
Mar 24 2020 8:59am
Forum: E-Bike General Discussion
Topic: Recommend a motor superior to the..
Replies: 20
Views: 1253

Re: Recommend a motor superior to the..

I realize this is an older thread...just posting to help those that might read it in the future. Warning...the 5KW 55H MXUS motor looks real good at first glance BUT I have read they use an obscure French thread on the cover so finding a freewheel that will work may be challenging. I sent MXUS a mes...
by Bullfrog
Mar 24 2020 8:26am
Forum: E-Bike General Discussion
Topic: Set a World Record
Replies: 22
Views: 802

Re: Set a World Record

Wow...this Land Speed thing has turned out to be quite a fiasco. I am a little slow but I finally realized that a hub motor will limit my top speed because I'll be limited by the gearing...available Kv and the rear tire diameter...regardless of how much amperage I can supply. So if I really want to ...
by Bullfrog
Mar 22 2020 7:25pm
Forum: E-Bike Technical
Topic: EM3EV Bluetooth BMS App
Replies: 12
Views: 2722

Re: EM3EV Bluetooth BMS App

Sweet....Thank You!
by Bullfrog
Mar 22 2020 2:52pm
Forum: E-Bike Technical
Topic: EM3EV Bluetooth BMS App
Replies: 12
Views: 2722

Re: EM3EV Bluetooth BMS App

I do not have the confirmation email...any chance somebody could send it to me via private message or post it here...Thanks.
by Bullfrog
Mar 22 2020 1:42pm
Forum: E-Bike Technical
Topic: EM3EV Bluetooth BMS App
Replies: 12
Views: 2722

Re: EM3EV Bluetooth BMS App

Need a little help please...where can I get the app for an android phone for my EM3ev battery? I am an old fart with a flip phone and my wife is the one with the android phone...this should be real fun :lol: . My battery is turning itself off when I hit 50.1 volts. It is a 14s5p battery with HG2 cel...
by Bullfrog
Mar 22 2020 9:29am
Forum: Items Wanted
Topic: A little off the subject but I keep harassing EM3ev to produce a 72v battery with around 5s or 6s...so it will be a little s
Replies: 0
Views: 191

A little off the subject but I keep harassing EM3ev to produce a 72v battery with around 5s or 6s...so it will be a little s

A little off the subject but I keep harassing EM3ev to produce a 72v battery with around 5s or 6s...so it will be a little smaller and lighter than their only 72v battery which is 20s10p. Been using their batteries for a good while and they perform great plus EM3ev stands behind them if you ever hav...
by Bullfrog
Mar 20 2020 9:38pm
Forum: E-Bike Reviews & Testing
Topic: My experience with "leafbike" electric bike kit
Replies: 32
Views: 17262

Re: My experience with "leafbike" electric bike kit

Front was a 27.5x2.8" Maxxis DHF I belive and the rear was a 20x4.00" Vee Mission Command.

I would not recommend it...steering was pretty slow and ground clearance was not that great.

It did help keep the MAC cooler :lol: .
by Bullfrog
Mar 19 2020 4:18pm
Forum: E-Bike General Discussion
Topic: QS 205
Replies: 18
Views: 1167

Re: QS 205

Awesome....Thanks markz.
by Bullfrog
Mar 19 2020 1:50pm
Forum: E-Bike General Discussion
Topic: QS 205
Replies: 18
Views: 1167

Re: QS 205

Just saw where MXUS offers a 5000W motor with a 55H stator and 150 OLD (dropout width). I sent them a message to see if they would tell me the Kv...but haven't heard back yet. Does anybody have any info on the MXUS 5000W motor? All these 5000W", 8000W, etc. claims are sort of meaningless. You have t...
by Bullfrog
Mar 19 2020 6:35am
Forum: Items for Sale - New
Topic: Assembled Hi-Power LiPo battery packs - any interest?
Replies: 570
Views: 117595

Re: Assembled Hi-Power LiPo battery packs - any interest?

jonescg...just finished reading through everything posted to date. Sure is nice to see somebody with a good technical understanding doing good work. It just reassures my faith in humanity for the future. Keep up the great work and never let your imagination be a limitation :D .
by Bullfrog
Mar 19 2020 5:47am
Forum: Motor Technology
Topic: Calculating QS205 motor torque vs. speed curves
Replies: 13
Views: 1760

Re: Calculating QS205 motor torque vs. speed curves

I have asked QS for the parameters required in the Grin Tech Motor Simulator to build a "Custom Motor" so I can vary the voltage/amperage supplied and compare the performance of a QS205/273 V3 motors. it's pretty unlikely that they will give you the info, even if they have it. they either prefer to...
by Bullfrog
Mar 18 2020 10:38am
Forum: Battery Technology
Topic: Building a high Amp output battery question
Replies: 38
Views: 2134

Re: Building a high Amp output battery question

maarkmohamed....so you plan to build a 26s1p battery using 18650 cells? It can be done BUT you are not going to have much capacity at your high amperage. Lets assume you use HG2 cells which are capable rated at 20A and 3 Ah. That means you will have 520A and 3 Ah...you will be able to go really fast...
by Bullfrog
Mar 17 2020 10:03am
Forum: Motor Technology
Topic: Calculating QS205 motor torque vs. speed curves
Replies: 13
Views: 1760

Re: Calculating QS205 motor torque vs. speed curves

I have been trying to decide what version of the QS 4000W 205 V3 motor would be best for my EV application. Are you looking for the projected top speed on a bike or motorcycle? My application is a multi-axle electric vehicle, to be specific. I have a good handle on the top speed. My question was mo...
by Bullfrog
Mar 17 2020 9:55am
Forum: Motor Technology
Topic: Calculating QS205 motor torque vs. speed curves
Replies: 13
Views: 1760

Re: Calculating QS205 motor torque vs. speed curves

Gentlemen (and ladies if there are any :)), This is a little off topic but I am trying to understand the QS205 and QS273 motors better so I can make an intelligent decision on my motor selection/winding. My overall objective is top speed in a straight line while running a 52.8 volt battery or 79.2 v...
by Bullfrog
Mar 15 2020 1:14pm
Forum: E-Bike Reviews & Testing
Topic: My experience with "leafbike" electric bike kit
Replies: 32
Views: 17262

Re: My experience with "leafbike" electric bike kit

Wow, you have a lot of decisions to make :lol: . My thoughts...go with a 14s/52v battery. You'll have more capacity and power available...even if you don't use it. Motor...lots of options. I like the MAC/GMAC. Use the Grin Tech Motor Simulator or the Trip Simulator (a little more complicated but giv...
by Bullfrog
Mar 14 2020 12:51pm
Forum: E-Bike Technical
Topic: Mxus 3k vs Qs205
Replies: 27
Views: 1590

Re: Mxus 3k vs Qs205

eCruiser3k...where did you find your numbers?

QS 205:
5t kv9,03
4t kv11,39
3t kv16,32

Thanks
by Bullfrog
Mar 14 2020 12:47pm
Forum: E-Bike Technical
Topic: Mxus 3k vs Qs205
Replies: 27
Views: 1590

Re: Mxus 3k vs Qs205

DogDipstick...you are correct. Forgot to mention I select "Thrust" as opposed to "Torque". Torque is constandt throughout a system where Thrust changes depending on gearing and wheel diameter. I mainly use the blue lines (thrust) for a relative comparison so I can quickly see how two motors compare ...