Endless Sphere

Hi Sascha, When you say "Bending swingarm" do you mean that the tubing of the swingarm bends because of the chain tension, or do you mean that the swing arm is "pulled upwards" by the chain tension? In my case, the motor is bolted to the swingarm itself and moves with it, so chai...

Hi Sraff, BHT packed the motor reasonably well... not great, but not bad. It arrived with the ends of 2 or 3 cooling fins slightly bent, which were easy to straighten out (I used a small Crescent spanner). I couldn't see any matching damage on the box, and wondered if the fins were bent before shipp...

For those of you who haven't seen it, This web page http://detail.1688.com/offer/1012215126.html includes test report tables and motor curve graphs for the motor that is the topic of this thread. The web page is in Chinese but the graphs and tables have enough English words and numbers to be useful....

Hi Sraff, Before buying my motor, I e-mailed YK Success directly trying to buy direct from them. I did not get a reply. If you were willing to take the risk, you could try using a Taobao agent to purchase direct from YK Success and ship it to you.. it would undoubtedly be the cheapest way. I conside...

Hi Matt, Having built an ocean-capable cruising yacht and lived / traveled on it for several years, I know about making every cubic millimetre count. I also for many years earned my living as a one-man-band mechanical engineer working out of a modest sized workshop. I can therefore understand and ap...

John, Here's a simple way to measure slopes (in degrees): Buy a spirit level with a rotatable element, put the level on the slope and rotate the dial until the bubble indicates level, then read the angle off the side. Cheap Chinese levels with this feature are cheap, and good enough for the purpose,...

With the high centre of gravity of the bike / rider and the short wheelbase of an electric bibycle, I would be extremely surprised if you could ride up a 100% (45 degree) slope at a steady speed regardless of torque or gearing. I think you would wheelstand if you had traction, wheelspin if you didn'...

Hi John, I agree that if you have room and do not mind the extra weight, buying a motor that is rated for the power you want makes sense, but the extra 60mm diameter and 5.6kg of weight are unacceptable for an off-road bike, especially when you are trying to fit it within an existing frame and suspe...

I like it Matt, Those aluminium extrusions allow rapid construction of rigid structures without the warping that can occur with welded structures, and allow great adjustability. As you say, there is good access for virtually all the welds needed on a frame, and no problem adjusting angles and positi...

Hi Dunkenb, Looked at images for the Mongoose ECD.. very interesting! lots of room under the frame triangle for the motor / gearbox. I would think you will be putting MUCH more torque through the clutch / gearbox than the original motor.. hope it stands up ok. Looking forward to the build... I think...

Hi Stielz, Thanks for the comments and ideas. I am doing quite a bit of research on the fuse / circuit breaker situation. I think I am heading towards fuses in the battery pack and circuit breaker as the main switch as well. I have discovered "Noark" brand high voltage DC circuit breakers ...

Hi Matt, I imagine you will get many different answers, as each person has different riding terrain in their neighbourhood, different skill levels, experience and expectations. So let's kick off my reply with a bit of background: I have 4 grandchildren (so far) and I have discovered that I bruise ea...

HiDirkdiggler, Regarding your suggested motor position: As well as raising the centre of gravity of the motor and moving it rearwards (both of which are bad effects on a high power bike), it would almost certainly increase the "effective unsprung weight" by positioning the motor where it m...

When I posted this morning I was a bit pushed for time, and I hadn't looked at the photos of the original shape of the hub. Now I have done that, I agree with Matt.. the hub was almost certainly not strong enough to start with, and (unless the spokes were loose) side force was probably more of an is...

Hi Eco, these high power beasts are definitely overloading standard bicycle components, even full-on downhill ones. I think the torque that can be transmitted to the rear hub under acceleration is MUCH higher than the braking torque because of weight transfer: When you are braking, weight is effecti...

Another question on the battery packs: 1) I hope never to have a battery fire, but if I do, I do not want an explosion caused by pressure building up inside a very strong battery box! Therefore I am guessing that I need to provide some form of venting,that would suppress flames as much as possible b...

Ok, Being a mechanical engineer, things so far have been within my comfort zone, but I am now getting into new fields.. the battery packs. I have enough electrical knowledge to fully understand the basics: Amps, Amp.hours, Volts, resistance, series, parallel etc, but I am new to LiPo and EV batterie...

Quite right Warren.. Obviously I hadn't been awake very long when I posted this morning!! :oops: Yes, just run the chain over one and under the other. Will still need freewheels to allow pedaling without having to turn the motors, but allow the motors to drive the chain when powered up, if that isn'...

Hi Robo. Using two small geared hub motors with freewheels to drive the chains in the Stokemonkey arrangement sounds like a good option. If you wanted the installation to be symmetrical you would need one left-hand and one right-hand freewheel and the motors would rotate in "opposite directions...

Hi Ksi, Looking really good. not much force needed to shift, so more options on gearchange mechanisms. I hope your wife feels good that she has contributed to the project.. It's good when whole families share a project! Agreed.. very important that neutral always happens between first and second.. l...

Hi Hennez, I know almost nothing about the Cyclone motors or kits, but if I am right they use brushless motors. If so, and if they have Hall Effect sensors, it is possible that you have an incorrect wiring combination on your hall sensors. That can allow the motor to run but with incorrect timing in...

Hi Askor,
if you had the time, and wanted to come up & see the bike one evening, you'd be welcome. pm me..
Where is home?
Dave

Hi Rodgah, I guessed the problem with the pictures was to do with their pixel count, as it started when I bought a new cellphone with a higher resolution camera. I "shrunk" the photos by e-mailing them to myself and ticking the "make smaller for e-mail" option, but obviously that...

Can anyone tell me why my photos are not displaying in my posts anymore? The only thing I can see different is that the photos less than 60 kiB display and the photos larger than 60kiB do not.. is that it? If so, I will have to figure out how to shrink them even more.

Real progress the last 2 evenings and today... The bike has brakes (borrowed off a freeride bike my son has outgrown), and I made a bracket to mount the rear brake to my swingarm back end. A bit more work to do in that department but I now have the basic shape of the bracket sorted and the brake is ...