Neo motor question

Clark

Member
Quick question on Neo motor - can anyone (maybe Ravi) tell me how many Nm of torque
the Dapu motor puts out? Thanx ahead - can't seem to find that info.

Clark
 

Ravi Kempaiah

Well-Known Member
Hi Clark,

The Dapu motor in Neo line is rated at 40Nm (peak Torque)
There are different Dapu motors that look the same ( 350W, 500W and 750W)
The mass of copper turnings inside the motor decides the power output.

Dapu motors.JPG
 

Ravi Kempaiah

Well-Known Member
That's pretty good considering the E3 Dash's 500w puts out 42Nm

Actually, last week I underwent a biomechanics lab session and measured my own Torque output.
My right leg (knee joint specifically) can put out a maximum of 95Nm during extension and 60 during retraction, left leg 65Nm and 40Nm respectively.

I asked the faculty about torque generated by elite athletes and he said it is ~130Nm or more.

So, compared to human power, 40Nm is really not bad.
 
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Clark

Member
Actually, last week I underwent a biomechanics lab session and measured my own Torque output.
My right leg (knee joint specifically) can put out a maximum of 95Nm during extension and 60 during retraction, left leg 65Nm and 40Nm respectively.

I asked the faculty about torque generated by elite athletes and he said it is ~130Nm or more.

So, compared to human power, 40Nm is really not bad.

Ravi - Thank you for that info!

Again, I'm about to buy my first e-bike for mainly work and errand purposes (see my other posts - pretty wordy sorry!) At most 20 mile round trip - I've pretty much distilled what I need down to two main things - stealth and decent climbing power. Here in NJ as of today 7/10 I've yet to see a ebike, anywhere, home area, down the shore - none! So with my budget, 3k, I figure the neo line is my best bet for stealth. My other need is because I almost lost my left leg in a car accident in college - 27 yrs ago - took 2.5 yrs to heal + ACL on left knee, never had a problem with it since - no limitations (skiing, etc.) EXCEPT I have had an issue a few times riding bikes uphill - not every time - but bad enough that I pretty much stopped riding to avoid dealing with it.

Ebike's are a game changer for that, I was worried about the 350w motor and wanted to know how much torque they put out, and I feel much better now - 40Nm should be fine. Now all I have to do is choose between the Neo City or Neo Cross (is it worth the extra $ to outfit the Cross just like the City- fenders, lights, rear rack?)

Anyway thanx Ravi and BTW, I would expect those results (the difference between Right and Left Leg strength) if I took that test - any reason for the disparity in leg strength? Is it common? Just wondering.

Clark
 

JoePah

Well-Known Member
Actually, last week I underwent a biomechanics lab session and measured my own Torque output.
My right leg (knee joint specifically) can put out a maximum of 95Nm during extension and 60 during retraction, left leg 65Nm and 40Nm respectively.

I asked the faculty about torque generated by elite athletes and he said it is ~130Nm or more.

So, compared to human power, 40Nm is really not bad.

That is some serious torque by humans! Watching those guys pedal furiously after 100 miles on the Tour makes you wonder though...
 

Ravi Kempaiah

Well-Known Member
Ravi - Thank you for that info!

Again, I'm about to buy my first e-bike for mainly work and errand purposes (see my other posts - pretty wordy sorry!) At most 20 mile round trip - I've pretty much distilled what I need down to two main things - stealth and decent climbing power. Here in NJ as of today 7/10 I've yet to see a ebike, anywhere, home area, down the shore - none! So with my budget, 3k, I figure the neo line is my best bet for stealth. My other need is because I almost lost my left leg in a car accident in college - 27 yrs ago - took 2.5 yrs to heal + ACL on left knee, never had a problem with it since - no limitations (skiing, etc.) EXCEPT I have had an issue a few times riding bikes uphill - not every time - but bad enough that I pretty much stopped riding to avoid dealing with it.

Ebike's are a game changer for that, I was worried about the 350w motor and wanted to know how much torque they put out, and I feel much better now - 40Nm should be fine. Now all I have to do is choose between the Neo City or Neo Cross (is it worth the extra $ to outfit the Cross just like the City- fenders, lights, rear rack?)

Anyway thanx Ravi and BTW, I would expect those results (the difference between Right and Left Leg strength) if I took that test - any reason for the disparity in leg strength? Is it common? Just wondering.

Clark

Hi Clark,

Sorry, I couldn't get to your post earlier. Coming back, I use my Neo Jumper 650B for mainly commuting, errands and weekend rides (trails, to DC etc). So, it is very similar to your intended purpose.

I had a sporting injury 2.5 years back and tore my left ACL and meniscus. It put a big limit on my running and biking abilities. Also, I didn't do the physiotherapy as prescribed (laziness, school work etc) so, my left leg is slightly weaker than the right.

For most people, I was told that there will be a difference in the torque output but in my case it is +10 or +20Nm more than others because of my ACL problem. Neo Jumper has changed everything and I am most thrilled about that. Now I can go on 40-50 mile rides, strengthen my leg and have all the fun.

Neo City is only good if you intend to use it for URBAN commuting where you don't go over 20mph (uses V-brake) but if you plan for trail rides or cruising at 20mph, Neo Cross is better. You can always add fenders, racks and pannier to it.

350w geared is perfect for me. Doesn't add too much weight like other direct drive systems and from the non-drive side you couldn't even tell if it's an ebike because the motor is so small. If you have test ridden, you know what I'm talking about.

Best
 

Court

Administrator
Staff member
Hey @Clark, I think Ravi has the right idea about the City vs. the Cross when it comes to riding but the lights, fenders and rack are so sweet on the City and Street that it's a tough call for me. I've been using a full suspension Haibike recently and had to buy all of the accessories separately which cost $200+ for nice ones. I've taken my bike off road but the day to day use is on city streets and I feel like if that is your primary use the basic suspension fork on the City and all of the nice components could work well. Both of those bikes are available in Medium or Large so that's not an issue. I think it just comes down to what type of riding you're really going to be doing most.