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by neptronix
May 20 2020 2:43pm
Forum: E-Bike General Discussion
Topic: eZee vs MAC? Your thoughts?
Replies: 16
Views: 345

Re: eZee vs MAC? Your thoughts?

I'd absolutely never use a rear rack again. Poor weight distribution, makes you more wheelie prone, induces a countersteering effect.... just no!

There's very good reasons why a motorcycle carries the majority of it's weight in it's center. Emulate that design at any opportunity you have.
by neptronix
May 19 2020 10:37am
Forum: E-Bike General Discussion
Topic: eZee vs MAC? Your thoughts?
Replies: 16
Views: 345

Re: eZee vs MAC? Your thoughts?

i've owned both.. get the mac!
ezee is not worth it for the small weight loss!
by neptronix
May 14 2020 5:39pm
Forum: Forum Rules and Features
Topic: The future of our forum - facebook versus web forums
Replies: 105
Views: 29727

Re: The future of our forum - facebook versus web forums

I'm still currently waiting on the next version of some forum software in order to solidify anything resembling a plan. But this is the year we need to make a big move. I'm glad that starting fresh sounds appealing. I think starting over again would be important not only for keeping things clean, re...
by neptronix
Apr 14 2020 2:10pm
Forum: E-Bike Build Threads / Photos & Video
Topic: Lightweight efficiency oriented BikeE conversion
Replies: 48
Views: 5322

Re: Lightweight efficiency oriented BikeE conversion

How do you find the handling of the BikeE versus the Cannondale? When I tried the BikeE (non-suspended version) many years ago, I found it bothersomely unstable. I haven’t tried the Cannondale. The bikeE with it's stock handlebars is super skittish at lower speeds. I replaced them with some cruiser...
by neptronix
Apr 10 2020 10:35pm
Forum: E-Bike Build Threads / Photos & Video
Topic: Lightweight efficiency oriented BikeE conversion
Replies: 48
Views: 5322

Re: Lightweight efficiency oriented BikeE conversion

Since my leg has almost fully recovered from the tibia fracture, i've been using the whipper snapper as a rehab bike... and pulling 20-30 mile rides nearly every day lately. The bike is very fun.. i adjusted the gearing so i could top out at 30mph... the only time a guy on a roadbike passes me is wh...
by neptronix
Mar 17 2020 10:24pm
Forum: E-Bike Non-hub Motor Drives
Topic: PaulD's lightweight mid drive development
Replies: 153
Views: 24277

Re: PaulD's lightweight mid drive development

A 3mm offset can be easily overcome with a pedal washer on one side, but yes, a 6" (152mm) q factor is hard to find outside of a pure road bike. My non-e mountain bike has a 178mm q-factor which is pretty normal. I just measured my bikes and it looks like your q factor is only +5mm of my widest set...
by neptronix
Mar 17 2020 1:34pm
Forum: E-Bike Non-hub Motor Drives
Topic: PaulD's lightweight mid drive development
Replies: 153
Views: 24277

Re: PaulD's lightweight mid drive development

Is it the q-factor or the offset that's an issue for you? Probably both. A BBS02 with it's 10-15mm offset on one side caused me to develop patellafemoral syndrome on the opposite leg, which was disabling until i did physical therapy. This happened within 100 miles of riding it over the course of 2 ...
by neptronix
Mar 17 2020 12:41am
Forum: E-Bike General Discussion
Topic: Efficiency test Geared vs Direct Drive Hub motors
Replies: 43
Views: 2127

Re: Efficiency test Geared vs Direct Drive Hub motors

okay that's interesting! coincidentally, that company is located in my area, aka goathead hell :thumb:
by neptronix
Mar 16 2020 7:51pm
Forum: E-Bike Non-hub Motor Drives
Topic: PaulD's lightweight mid drive development
Replies: 153
Views: 24277

Re: PaulD's lightweight mid drive development

With the new torque sensor, Q-factor is about 180mm for a 73mm BB. I measure about 90mm each side +/- a few mm. I switched from Miranda 4mm offset cranks to 0mm since the Erider BB spindle is longer than the Sempu. Q-factor for a 68mm BB is about 175mm. edit: I noticed the Erider datasheet says dri...
by neptronix
Mar 16 2020 1:55pm
Forum: E-Bike General Discussion
Topic: Efficiency test Geared vs Direct Drive Hub motors
Replies: 43
Views: 2127

Re: Efficiency test Geared vs Direct Drive Hub motors

If you're wanting to prevent flat tires on city streets, moped/motorcycle tires are still the best way to go. The thickest bike tire i have ever measured has only 7-8mm of rubber, whereas 11mm ( beyond the average length of a goathead ) of rubber is pretty common for MC tires. MC/moped tires also te...
by neptronix
Mar 16 2020 1:11am
Forum: E-Bike Non-hub Motor Drives
Topic: PaulD's lightweight mid drive development
Replies: 153
Views: 24277

Re: PaulD's lightweight mid drive development

quick question, does one pedal have more outward offset than the other? if so, how much?

wanna know if th q factor is even.
by neptronix
Mar 14 2020 10:37pm
Forum: E-Bike General Discussion
Topic: Efficiency test Geared vs Direct Drive Hub motors
Replies: 43
Views: 2127

Re: Efficiency test Geared vs Direct Drive Hub motors

The aotema motor is pretty inefficient as far as DDs go and the bafang is a newer higher efficiency design. Your result isn't a big surprise ;) ebikes.ca motor simulator shows us that geared motors generally lag well behind modern DDs in efficiency in a majority of situations.. https://www.ebikes.ca...
by neptronix
Mar 13 2020 11:18pm
Forum: E-Bike Non-hub Motor Drives
Topic: PaulD's lightweight mid drive development
Replies: 153
Views: 24277

Re: PaulD's lightweight mid drive development

i'm interested in one sans battery still.
by neptronix
Mar 11 2020 9:54am
Forum: Battery Technology
Topic: Thread for new battery breakthrough PR releases
Replies: 1649
Views: 236034

Re: Thread for new battery breakthrough PR releases

Hot off the presses.. John Goodenough, inventor of the original lithium battery, has a buyer and a plan to commercialize his glass based batteries.. https://www.theregister.co.uk/2020/03/02/canadian_firm_to_develop_goodenoughs_new_glass_battery/ The test cell had almost the capacity of an 18650 but ...
by neptronix
Mar 09 2020 6:26pm
Forum: E-Bike Build Threads / Photos & Video
Topic: small wheel efficiency
Replies: 12
Views: 1638

Re: small wheel efficiency

with double suspension it gets better, I'm not young and I use the chains to turn symbolically, and for emergencies. Yeah a 20" wheel with a moto tire and air/oil rear suspension will ride like a luxury car with the right tune... you'll only notice the small diameter of the wheel when you ride over...
by neptronix
Mar 09 2020 6:23pm
Forum: E-Bike Technical
Topic: New build, Bafang G310, phantom voltage loss???
Replies: 4
Views: 846

Re: New build, Bafang G310, phantom voltage loss???

geared motors freewheel in one direction, but not the other.. a dual reduction motor like a g310 will also have more drag than a single reduction one.. but should freewheel pretty well in the right direction. You just need to worry if it's got a lot of resistance both ways. That means your clutch is...
by neptronix
Mar 09 2020 6:11pm
Forum: E-Bike Build Threads / Photos & Video
Topic: small wheel efficiency
Replies: 12
Views: 1638

Re: small wheel efficiency

Range 20 wheel 92 km at 45.8kph, Batt Power 640W. Range 26 wheel 69 km at 54.3kph 974W. Not a good comparison, because aerodynamics affect the wattage per mph quite a bit at those higher speeds. You have to compare at the same speed, sadly. Running a smaller wheel often gives you a small hit in eff...
by neptronix
Mar 07 2020 12:34pm
Forum: General Discussion
Topic: Commission wars- E Trade and others drop to $0 and stocks DROP- hornets in the garage!
Replies: 21
Views: 3075

Re: Commission wars- E Trade and others drop to $0 and stocks DROP

$0 commissions have been a thing for a while with companies like robinhood.

How they make money is still a mystery to me. AFAIK they collect some kind of interest on cash you have sitting in your reserve when it's not dedicated to stocks.
by neptronix
Mar 05 2020 6:09pm
Forum: Motor Technology
Topic: Leaf / leafmotor / leafbike high efficiency 1500w motor
Replies: 1589
Views: 223419

Re: Leaf / leafmotor / leafbike high efficiency 1500w motor

I was told at Interbike that it costs less than $10 per motor, so I am shocked and saddened that more hubs aren't the thinnest lams by default, without some special order and a huge MOQ Yeah, i heard MAC pays another $20 for their 0.27mm geared hub lams vs the 0.35mm. The few % of efficiency gain a...
by neptronix
Mar 04 2020 8:39pm
Forum: E-Bike General Discussion
Topic: The end of BionX?
Replies: 195
Views: 39311

Re: The end of BionX?

spinningmagnets wrote:
Mar 04 2020 6:06pm
Pic is a BionX D-series in a 20-inch rim

Image
ooh with that diameter of stator, that thing would be a little beast off the line in a 20".. yummy!
by neptronix
Mar 04 2020 1:38am
Forum: E-Bike General Discussion
Topic: Used Ebike from Craigslist - worth it?
Replies: 9
Views: 665

Re: Used Ebike from Craigslist - worth it?

you could build something for $1500 that doesn't weigh 100lbs; i recommend you do it :)

nice battery on that thang tho.
by neptronix
Mar 03 2020 12:10pm
Forum: Motor Technology
Topic: Leaf / leafmotor / leafbike high efficiency 1500w motor
Replies: 1589
Views: 223419

Re: Leaf / leafmotor / leafbike high efficiency 1500w motor

Also, does anyone have figures for the hysteresis drag torque and eddy current drag torque for the Leafbike motors? I could not find these figures published anywhere, but it would be nice to calculate how much wattage I'll need to overcome the cogging losses when riding with the drive system turned...
by neptronix
Feb 28 2020 12:55pm
Forum: E-Bike Technical
Topic: E bike shivers before the ride
Replies: 11
Views: 816

Re: E bike shivers before the ride

Likely bad hall sensors or hall sensor wiring.. Another possible problem is that the battery voltage is dropping too low on startup.. IE you have a wiring or connector problem.. or the battery is not sufficiently rated for the load the motor wants to draw at startup. You'd need some equipment to ful...
by neptronix
Feb 20 2020 2:53pm
Forum: Food and Drink
Topic: Cured my wife's anxiety and my depression with nutritional supplements.
Replies: 27
Views: 1984

Re: Cured my wife's anxiety and my depression with nutritional supplements.

These days I try to mix in carbs in the form of berries and even potatoes sometimes but I always feel way better without them. Wish it weren't true because pizza is awesome, but it's not worth my life. Same. I've gradually worked up to handling ~150g of carbs in a meal with zero ill effect. 7 years...