1. https://wattwagons.com/blogs/news/archon-x1-controller - a couple of torque curves for the new controller.1) Isn't battery voltage a factor to counteract the back emf of the motor? I'd love to see a torque versus RPM curve for the ultra. 40mph feels like a good speed target for me, and I guess the human RPM matters too... That's a good point. I feel like my Juggernaut is running out of steam at around 30mph. I can comfortably get to 35mph when the battery is full and my top speed was 40mph on level ground, but I was at the limit of my leg speed. Definitely not sustainable.
2. 40mph on a bike is FAST! I would highly recommend recommend riding with better body protection gear, full face helmet etc. I have topsided on my motorcycle at 40 mph and it hurts like hell even with body armor and a full face helmet.
3. Using 52V pack versus 48V pack will allow you to get more assist for a longer time.
1. https://www.cyclingabout.com/belt-drivetrain-efficiency-lab-testing/ (belt versus chain)2) Isn't belt drive lower efficiency than a chain though? Are you saying the Rohloff is more efficient than the Shimano 3 speed IGH? That would surprise me since there are more gears in the Rohloff...
2. http://www.cyclingabout.com/speed-difference-testing-gearbox-systems/ (hub efficiency comparison)
That is correct ....the pivot point for rear suspension is almost always offset from the bottom bracket. So you need some form of tensioner for the drive train - for both chain and belt.3) Is there a reason suspension bikes can't put the suspension pivot point concentric with the crank bearing? This would get rid of the need for a tensioner altogether.... I've never understood that limitation.
That is well within the design spec for the UC Pro. No problem.4) Fully loaded I've been around 300lbs on the bike. I'm typically in assist level 5 doing 30mph on level streets. However, I'm pounding through curbs and launching off speed bumps at that speed. Max weight would be 250lbs'ish. These distances are only around 10 miles. My long distance riding is eco 3 averaging 20mph for 60 miles. I usually need to charge for a bit at the halfway point using a 48V 21Ah battery. There are many spurts of throttle on this trip, and there's a lot of starting and stopping. Terrain is half asphalt half gravel. I lose about 2mph for the same human effort in the gravel.
Belt slipping? You need to tension it better - try around 43-44lbs. I ride with 2500/3000W all the time and have had no issues with slipping, even on inclines.On my Luna Stealth, there is a parking garage at work with a steep incline. I can get the belt to slip with the 500W peak of the motor and 250lbs from the rider standing on the pedal to get started from a stop (gotta stop and swipe a badge to get out). I find myself riding that limit of the belt slipping to get started. That's why I'm worried about 4000W going through the belt (although really it's the low speed torque that is more concerning).
It is pre-tuned for every motor. We have addressed the "torque coming on slowly" part with Archon.5) How configurable will the tuning be on the new controller? I wouldn't mind a bit less torque down low, and coming on more slowly than both of my bikes. There should be tuning tables for time domain and inclination levels and gearing? Could also compensate for total weight too.
We are working on adding ride profiles, and configuring assist per PAS level - will be a firmware upgrade available later in the year. May need a new display, but we are working on it.
Regen occurs when the motor is spinning with the wheel. This way we capture the power when rolling freely downhill (or coasting).6) For urban city riding, the ability for regen would be very cool too. I know on long rides it matters less but it would increase my urban distance by at least 30% and dramatically reduce the wear on brakes. I replace my pads every 500 miles because I'm always accelerating and stopping hard...
Mid drive and regen dont mix (if at all). On a mid drive, when you coast, or are rolling downhill, the motor stops spinning...so there is no regen !
If you want regen, you probably want some form of hub motor.