Light Electro Bobber (short version)

Joined
Feb 1, 2016
Messages
100
New project Bobber version 2 short
Previous version - https://endless-sphere.com/forums/viewtopic.php?f=6&t=82251&p=1213984#p1213984
Max speed- 110-120km\h
Frame-Aluminum magnesium alloy
Sizes-1950mm x 940mm x 500mm
Weight - 60kg
Wheels- rims 24 x 100mm cicle classic,hubs 135 axis 15mm, crazy bob tires
Motor - Lti 2.7kw(nom)12kW (max) 48v 5500rpm, 5kg(converted, rewind, added hall sensors.)
Battery - CATL 3.7v52ach 13S2P + smart bms
Controller-Kelly kls60350
Motor+controller test
https://www.youtube.com/watch?v=lfq1kAV0E-g
The continuation follows ....
 

Attachments

  • Безымянный77.jpg
    Безымянный77.jpg
    61 KB · Views: 3,430
  • Безымянный7777.png
    Безымянный7777.png
    34.8 KB · Views: 3,430
  • 20181028_151619_Film1[1].jpg
    20181028_151619_Film1[1].jpg
    147.3 KB · Views: 3,430
  • 20181026_141115_HDR_Film1[1].jpg
    20181026_141115_HDR_Film1[1].jpg
    109.4 KB · Views: 3,430
  • 20190205_200115_Film1.jpg
    20190205_200115_Film1.jpg
    90.4 KB · Views: 3,430
  • 20190308_082419_Film1[1].jpg
    20190308_082419_Film1[1].jpg
    206.3 KB · Views: 3,430
  • 20190305_161426_Film1[1].jpg
    20190305_161426_Film1[1].jpg
    153.4 KB · Views: 3,430
  • 20190312_181743_Film1[1].jpg
    20190312_181743_Film1[1].jpg
    190.8 KB · Views: 3,430
Assembled the frame with the battery and broke the smart bms (Accidentally cut SMD components) (
 

Attachments

  • 20190317_215110_Film1[1].jpg
    20190317_215110_Film1[1].jpg
    138.8 KB · Views: 3,320
  • 20190317_215119_Film1[1].jpg
    20190317_215119_Film1[1].jpg
    76.7 KB · Views: 3,320
I like that you're going for a totally different look from a common motorcycle. I want to go for a lot more aero when I try a design that's out there, but that's a big reason I haven't done one yet. Is that a Hossack front end with rectangular wishbones or is it called something else?
 
John in CR said:
I like that you're going for a totally different look from a common motorcycle. I want to go for a lot more aero when I try a design that's out there, but that's a big reason I haven't done one yet. Is that a Hossack front end with rectangular wishbones or is it called something else?
Hi.
It is not Hossack .This front fork entirely my development is executed according to the scheme parallerogramm.
 
John in CR said:
I like that you're going for a totally different look from a common motorcycle. I want to go for a lot more aero when I try a design that's out there, but that's a big reason I haven't done one yet. Is that a Hossack front end with rectangular wishbones or is it called something else?
https://www.youtube.com/watch?v=vbOxo2vMkXk&feature=youtu.be
 
John in CR said:
I like that you're going for a totally different look from a common motorcycle. I want to go for a lot more aero when I try a design that's out there, but that's a big reason I haven't done one yet. Is that a Hossack front end with rectangular wishbones or is it called something else?
Do you have sketches of what you want to do?
 
Alexander1971 said:
Do you have sketches of what you want to do?

If I had a shape in mind I'd already be building. Yours is interesting, but I'm more practical and view a lot of that empty space between the tires as lost. It just drives me crazy that emoto manufacturers are trying to make their bikes look so much like existing gassers. I want to see stuff that both looks and is sleek, and since we don't have all that heat to dissipate it should be easy.

Even though yours isn't my particular cup of tea, I can and do appreciate it as a form of engineering art. I absolutely agree with your monocoque structure. With space at such a premium until batteries take a big jump forward, so much of our componentry requiring protection from the elements, and low cooling requirements, tubular frames make absolutely no sense to me.
 
John in CR said:
Alexander1971 said:
Do you have sketches of what you want to do?

If I had a shape in mind I'd already be building. Yours is interesting, but I'm more practical and view a lot of that empty space between the tires as lost. It just drives me crazy that emoto manufacturers are trying to make their bikes look so much like existing gassers. I want to see stuff that both looks and is sleek, and since we don't have all that heat to dissipate it should be easy.

Even though yours isn't my particular cup of tea, I can and do appreciate it as a form of engineering art. I absolutely agree with your monocoque structure. With space at such a premium until batteries take a big jump forward, so much of our componentry requiring protection from the elements, and low cooling requirements, tubular frames make absolutely no sense to me.

I totally agree with you.
I wanted to get away from the standards and do something original, but I also do neo-classic bikes(frame purchased on a cycle classic).
 

Attachments

  • 4735303509.jpg
    4735303509.jpg
    177.4 KB · Views: 3,252
John in CR said:
tubular frames make absolutely no sense to me.

I guess your engineering chops could use honing. No goofy curved nonsense is ever going to touch an intelligently designed frame made from straight round tubes in terms of structural efficiency. Maybe you can only appreciate maximal efficiency in motors?
 
Chalo said:
John in CR said:
tubular frames make absolutely no sense to me.

I guess your engineering chops could use honing. No goofy curved nonsense is ever going to touch an intelligently designed frame made from straight round tubes in terms of structural efficiency. Maybe you can only appreciate maximal efficiency in motors?

Right Chalo,
Since batteries require protection and covering, no tubular frame could ever come close to the weight/performance ratio in terms of structural integrity of a properly executed monocoque construction. I guess you didn't see the video of the NYX frame being rolled over by a Hummer without a scratch. Hollow tubes waste what is the biggest premium on our bikes...space. Get your head out of the limited distance, limited speed, limited usefulness as practical transportation, bicycle cloud.
 
John in CR said:
Chalo said:
John in CR said:
tubular frames make absolutely no sense to me.

I guess your engineering chops could use honing. No goofy curved nonsense is ever going to touch an intelligently designed frame made from straight round tubes in terms of structural efficiency. Maybe you can only appreciate maximal efficiency in motors?

Right Chalo,
Since batteries require protection and covering, no tubular frame could ever come close to the weight/performance ratio in terms of structural integrity of a properly executed monocoque construction.

My battery pack's covering and protection is nylon fabric lined with closed-cell foam. I wouldn't want to try to ride a bike frame made of these things, though they are weight-efficient for their particular job. No, I don't think a monocoque the size and stiffness of my bike would be as strong while weighing less than my straight-tubed frame plus cushioned battery bag. Not unless the "monocoque" approximated a single straight round tube, anyway.
 
That looks like an awesome charger. Do you really plan on charging at 56A regularly? For opportunity charging where quick charge is important, yeah sure, but in 11 years of ebiking I can count the times I've wanted more than the 6A charger I use on one hand. Just over 1C charging seems stressful to me.
 
John in CR said:
That looks like an awesome charger. Do you really plan on charging at 56A regularly? For opportunity charging where quick charge is important, yeah sure, but in 11 years of ebiking I can count the times I've wanted more than the 6A charger I use on one hand. Just over 1C charging seems stressful to me.
Yes, I will constantly charge 56 amps this is 0.5C of my battery (48v104ah). I still have such charging and I think make a quick charge 48v112ab or 48v168a!)
 
I must have misread. Wow 104ah...that's some long distance cruising. I can get 100km without a deep discharge at traffic speeds with my 45ah pack on my most recent scooter, so probably 150km or more riding to conserve. Until a build a big heavy hog, I think 100ah would be too much saddle time for me.

Sure, that's a great charger for your pack. What kind of price? I tried poking around for prices of Eaton chargers and came up empty.

With so much weight so high, how are you going going to handle the kick stand? I've opted to keep batteries low after experimenting with high. Up high always makes the bike feel heavier to me, and I prefer as light and nimble a feel as possible.
 
John in CR said:
I must have misread. Wow 104ah...that's some long distance cruising. I can get 100km without a deep discharge at traffic speeds with my 45ah pack on my most recent scooter, so probably 150km or more riding to conserve. Until a build a big heavy hog, I think 100ah would be too much saddle time for me.

Sure, that's a great charger for your pack. What kind of price? I tried poking around for prices of Eaton chargers and came up empty.

With so much weight so high, how are you going going to handle the kick stand? I've opted to keep batteries low after experimenting with high. Up high always makes the bike feel heavier to me, and I prefer as light and nimble a feel as possible.
This project(3kw battery) run over 130km(city cycle)-https://endless-sphere.com/forums/viewtopic.php?f=6&t=82251&p=1213984#p1213984
New project(5kw battery) will run over 200-250km(due to the high efficiency of the motor at low, medium and high speeds)!
Charger Eaton 3000w 13S 54.6V 56A I buy in China in the domestic market (100-150$).
If you need this charger(13S 54.6v 56ah), I can sell as I have a few.
I have a universal charger for sale-https://endless-sphere.com/forums/viewtopic.php?f=31&t=99264
In my project, the weight is distributed and the maximum weight in the area of the motor at the bottom and on the front wheel is a small load.
 
John in CR said:
I must have misread. Wow 104ah...that's some long distance cruising. I can get 100km without a deep discharge at traffic speeds with my 45ah pack on my most recent scooter, so probably 150km or more riding to conserve. Until a build a big heavy hog, I think 100ah would be too much saddle time for me.

Sure, that's a great charger for your pack. What kind of price? I tried poking around for prices of Eaton chargers and came up empty.

With so much weight so high, how are you going going to handle the kick stand? I've opted to keep batteries low after experimenting with high. Up high always makes the bike feel heavier to me, and I prefer as light and nimble a feel as possible.
I forgot to say that the weight of my battery is only 23 kg and the weight of the electrobike is 60-62 kg!
 
handlebar
 

Attachments

  • 20190326_132533_Film1[1].jpg
    20190326_132533_Film1[1].jpg
    139.9 KB · Views: 3,046
  • 20190326_132640_Film1[1].jpg
    20190326_132640_Film1[1].jpg
    59.5 KB · Views: 3,046
Very interesting design and cool build up story :bigthumb:
 
Back
Top