Did a 58 min full throttle/max pedal input ride today through the hills of Palos Verdes with 3 x 10Ah LiFePO4 batteries carried in a backpack. Something interesting happened while I was traveling down the steep hill on Hawthorne Blvd heading north towards Torrance. I decided to see if I can push the bike past 43 mph with the Schlumpf in high gear and me pedaling like a banana throwing monkey
The resistance going downhill at 43 mph is hard to overcome, but with alot of pedal effort, I broke the barrier and something really strange happened...it was like I hit a turbo boost button when I past 43 mph to 44 mph...the bike quickly lurched to 49 mph (this is the mph indicated on the Bionx consol...with the wheel diameter programmed at 1596 for a 20 inch rim.) During that steep leg of the trip, I was able to do this twice and each time I overcame the resistance from 43 mph to 44 mph, the bike quickly lurched forward to 49 mph and maintained that speed during the entire steep section and the pedaling became effortless. This is achieved with no throttle input, just plain pedaling with the system at 0 assist. In my normal pedal bike, I could only manage 48 mph down that same steep portion of road. I need to do another test tomorrow to see if this can be replicated. I think I need to purchase a separate bike speedo to verify the speed. But from all indications, I was going pretty fast because I was keeping up with the motor traffic... Who said back EMF's are bad ...on second thought...they are badddddd
Stats of the ride from the Watts up meter & Bionx consol:
21.8 mi, 58 mins, Average speed 21.3 mph, starting voltage 40.27V, ending voltage 39.55V, used 7.554 Ah, voltage sag 37.45 Vm, 934.5 Wp, 289.9 Wh, 24.48 Ap...who knows what the motor back emf was doing when it "boosted" the bike from 44 to 49 mph during the steep downhill run
Did a few more hill tests but could not replicate what happened during the last ride...highest speed achieved downhill was 45 mph with vigorous pedaling in high gear...a nice view from the hills...total miles on the Bionx odometer 1122 miles.
more test rides: 01/02/2010 with 2 batteries in the not so back breaky "power" pack. top downhill speed...51 mph sustained, calm, warm, windless conditions are required to sustain these speeds. 26.2 miles, 40.70V start, 39.40V end, used 9.875 Ah, 35.79 Vm, average speed 20.5 mph, 25.93 Ap, 962.2 Wp, 371.1 Wh, ride duration 1 hr 54 mins...my electic bikey can keep up with roadies downhill...never thought it could happen...but with the Schlumpf HS Drive...it's possible with alot of pedal input
01/03/2010 2 batteries, top downhill speed...51 mph sustained, another calm, warm, windless day, slowest uphill speed 14 mph, 16.4 miles averaged 20.3 mph, 41.40 V start, 39.56V end, used 6.67 Ah, 989.1 Wp, 26.51 Ap, 36.49 Vm, 251.5 Wh, 981.9 Wp...ride duration 45 mins.
a few pics:http://s488.photobucket.com/albums/rr24 ... Custom.jpghttp://s488.photobucket.com/albums/rr24 ... Custom.jpghttp://s488.photobucket.com/albums/rr24 ... Custom.jpg