benthomsen
1 mW
Hi all,
I have been searching and browsing these forms for all sorts of info over the last 6 months or so gathering info for a design/build I am currently working on. Some awesome info and tips on here as well as some sweet builds.
As for my project the title basically sums it up. I'm pretty sure it still counts as a bike, hopefully ive come to the right place. I'm just looking for a bit of input really, general comments and ideas if anyone's interested. The design is well underway and almost complete, I have a full 3D CAD model and have built and tested a range of the components. Main construction is Carbon Fibre Tube and Aluminium.
I just need to nail down the electric side of things really and make sure the motors can push this thing along. Needs to be a bit of a torque beast, not looking for more than 50km/h on the flat. Just want to be able to handle grass, dirt, mud, sand, and snow with ease.
Total Weight - 90-100kg MAX (excl rider) includes chassis, swing arms, drive gear, suspension, wheels, motors, batteries, controllers etc (this has been calculated and will be close to final weight)
Rider weight ~80kg
4x 28' Custom Airless Tires/Wheels - Weighing 6.5kg each MAX, plus motor weight of 7-8kg each. Will probably require a bit of torque, looking to reduce weight as much as possible (mostly for torque and unsprung-weight reasons). Wheels are off-road with thin rubber tread at 500mm wide, plenty of grip and a decent footprint with low ground pressure.
Pedal Assist - "electric chain" type, reduces complex mechanical links in the 4 wheel system and still get "pedal-assist" bike, eventually also use as a throttle with various "assist" power levels, basically a range extender. Crank with Gates belt drive to a motor for regen (possible 3 speed hub to spin motor at ideal rpm). Generator motor undecided.
4x Crystalyte Motors - Single Side Axles. Running 48-60V, guessing 1000-2000W each. Currently deciding between HS4080, HS3540 or HT3525. All depending on weight, torque, power etc.
2x Roboteq HBL2360 Dual Channel Controllers - 60V, 2x 75A Max (50A cont), regen, reverse and also looking at programming/scripting a form of electronic diff-lock or traction control across each pair of motors.
Batteries - 48-60V Undecided, haven't really got that far.
Any ideas which Crystalyte motor to go for? am I going to have enough power for a decent launch to get out of holes, over bumps, up hills etc? battery size and power? or any experience with the controllers would be great. I have plenty of space on the chassis for batteries. Hope that's enough info for now, I've got a pretty clear picture in my head anyway. Happy to answer any questions!
Thanks! Ben
I have been searching and browsing these forms for all sorts of info over the last 6 months or so gathering info for a design/build I am currently working on. Some awesome info and tips on here as well as some sweet builds.
As for my project the title basically sums it up. I'm pretty sure it still counts as a bike, hopefully ive come to the right place. I'm just looking for a bit of input really, general comments and ideas if anyone's interested. The design is well underway and almost complete, I have a full 3D CAD model and have built and tested a range of the components. Main construction is Carbon Fibre Tube and Aluminium.
I just need to nail down the electric side of things really and make sure the motors can push this thing along. Needs to be a bit of a torque beast, not looking for more than 50km/h on the flat. Just want to be able to handle grass, dirt, mud, sand, and snow with ease.
Total Weight - 90-100kg MAX (excl rider) includes chassis, swing arms, drive gear, suspension, wheels, motors, batteries, controllers etc (this has been calculated and will be close to final weight)
Rider weight ~80kg
4x 28' Custom Airless Tires/Wheels - Weighing 6.5kg each MAX, plus motor weight of 7-8kg each. Will probably require a bit of torque, looking to reduce weight as much as possible (mostly for torque and unsprung-weight reasons). Wheels are off-road with thin rubber tread at 500mm wide, plenty of grip and a decent footprint with low ground pressure.
Pedal Assist - "electric chain" type, reduces complex mechanical links in the 4 wheel system and still get "pedal-assist" bike, eventually also use as a throttle with various "assist" power levels, basically a range extender. Crank with Gates belt drive to a motor for regen (possible 3 speed hub to spin motor at ideal rpm). Generator motor undecided.
4x Crystalyte Motors - Single Side Axles. Running 48-60V, guessing 1000-2000W each. Currently deciding between HS4080, HS3540 or HT3525. All depending on weight, torque, power etc.
2x Roboteq HBL2360 Dual Channel Controllers - 60V, 2x 75A Max (50A cont), regen, reverse and also looking at programming/scripting a form of electronic diff-lock or traction control across each pair of motors.
Batteries - 48-60V Undecided, haven't really got that far.
Any ideas which Crystalyte motor to go for? am I going to have enough power for a decent launch to get out of holes, over bumps, up hills etc? battery size and power? or any experience with the controllers would be great. I have plenty of space on the chassis for batteries. Hope that's enough info for now, I've got a pretty clear picture in my head anyway. Happy to answer any questions!
Thanks! Ben