Drunkskunk
100 GW
Last year I got one of Jason's $200 deals on the first run of 9C 9X7s, and built a bike of scrap parts around it. It preformed brilliantly, and using it as a back up bike and loaner, I've put 1000 miles on it. Its nearly flawless as an Ebike, but about as interesting to ride as listening to stories of other people's pets.
So this week I grabbed one of the 6X10 motors. Since it's identical, and I had a spare freewheel, tire, and tube, I was able to do some hot swap testing of the 2 motors.
Most of my testing was done for seat of the pants diffrence, but here's the numbers of whats measurable.
9X7 @55.5 Volts, 15s Lipo, 22A controller
700C X 37 semi slick tires.
38mph Unloaded speed
29mph top riding speed after 1/2 mile flat ground, no wind, tucked
38lbs of torque (*based on Ebikes.ca simulater, 52.8V battery)
6X10 @55.5 Volts, 15s Lipo, 22A controller
700C X 37 semi slick tires.
31mph Unloaded speed
24mph top riding speed after 1/2 mile flat ground, no wind, tucked
43lbs of torque? (*Geussing, but there is 5lbs diffrence between the 2805 and 2807, so 5lbs may be conservitive for the 2810)
The 9X7 rides smooth at top speed. It has good torque off the line, and can keep pace with cars going through an intersection. it will do a no-peddle, standing start up a 10% grade.. a wheelchair ramp 10 feet long, with a 1 foot rise. It complains loudly the whole way. Throttle response is imidiatte, but it can be hard to get the motor to go the exact speed you want. The torque curve flattens out above 20mph, and if you're going less than top speed, it takes constant throttle corrections to maintain a constant speed. Rolling up an 6 inch curb is easy enough, but you either need to be rolling when you approach it, or peddle assist the bike over the curb. you can stall the motor on mounting a curb from a standstill
The 6X10 Rides even smoother at it's top speed. It doesn't feel like much more torque than the 9X7, but you feel it pulling for longer. Accelleration feels about the same as the 9X7 but tops out at a lower top speed. It will do the same standing start up a 10% grade ramp, complaining as loudly at the start, but is quiet by the top. Throttle response is good, and it takes fewer throttle corrections to maintain a desired speed. Rolling up the same curb, the 6X10 won't stall out. It will complain very loudly, sounding like its going to chew through the cover and come bite you, but it will push the bike up and over from a standing start. The 6X10 is as loud as the 9X7, but it doesn't growl as much on accelleration
What I noticed most about the 6X10 was how much fun it was. Yes, the bike is 5mph slower, but the throttle response is better, and its ability to hold speed while changing hill grade or turning into a headwind is better. The motor was as loud as the 9X7, but it's quieter under load and climbing hills. it just complains less. After completing the same circuit as I had with the 9X7, I decided to take the bike off road a bit. It has road tires, is a hard tail, and the batteries are unsecured in a temporary seat rack, but it was dark and I had no headlight, so I figured I wasn't going to be too hard on it. The motor handled it well, pulling up hills I wouldn't have tried on the 9X7.
The Bike with the 9X7 was Zen like in it's balance of power and function. it was simply a tool that did its job well, and reliably. Boringly. The 6X10 gives it a kick in the @ss. I think I'll need to build a new bike around this motor, to take fulll advantage of it.
So this week I grabbed one of the 6X10 motors. Since it's identical, and I had a spare freewheel, tire, and tube, I was able to do some hot swap testing of the 2 motors.
Most of my testing was done for seat of the pants diffrence, but here's the numbers of whats measurable.
9X7 @55.5 Volts, 15s Lipo, 22A controller
700C X 37 semi slick tires.
38mph Unloaded speed
29mph top riding speed after 1/2 mile flat ground, no wind, tucked
38lbs of torque (*based on Ebikes.ca simulater, 52.8V battery)
6X10 @55.5 Volts, 15s Lipo, 22A controller
700C X 37 semi slick tires.
31mph Unloaded speed
24mph top riding speed after 1/2 mile flat ground, no wind, tucked
43lbs of torque? (*Geussing, but there is 5lbs diffrence between the 2805 and 2807, so 5lbs may be conservitive for the 2810)
The 9X7 rides smooth at top speed. It has good torque off the line, and can keep pace with cars going through an intersection. it will do a no-peddle, standing start up a 10% grade.. a wheelchair ramp 10 feet long, with a 1 foot rise. It complains loudly the whole way. Throttle response is imidiatte, but it can be hard to get the motor to go the exact speed you want. The torque curve flattens out above 20mph, and if you're going less than top speed, it takes constant throttle corrections to maintain a constant speed. Rolling up an 6 inch curb is easy enough, but you either need to be rolling when you approach it, or peddle assist the bike over the curb. you can stall the motor on mounting a curb from a standstill
The 6X10 Rides even smoother at it's top speed. It doesn't feel like much more torque than the 9X7, but you feel it pulling for longer. Accelleration feels about the same as the 9X7 but tops out at a lower top speed. It will do the same standing start up a 10% grade ramp, complaining as loudly at the start, but is quiet by the top. Throttle response is good, and it takes fewer throttle corrections to maintain a desired speed. Rolling up the same curb, the 6X10 won't stall out. It will complain very loudly, sounding like its going to chew through the cover and come bite you, but it will push the bike up and over from a standing start. The 6X10 is as loud as the 9X7, but it doesn't growl as much on accelleration
What I noticed most about the 6X10 was how much fun it was. Yes, the bike is 5mph slower, but the throttle response is better, and its ability to hold speed while changing hill grade or turning into a headwind is better. The motor was as loud as the 9X7, but it's quieter under load and climbing hills. it just complains less. After completing the same circuit as I had with the 9X7, I decided to take the bike off road a bit. It has road tires, is a hard tail, and the batteries are unsecured in a temporary seat rack, but it was dark and I had no headlight, so I figured I wasn't going to be too hard on it. The motor handled it well, pulling up hills I wouldn't have tried on the 9X7.
The Bike with the 9X7 was Zen like in it's balance of power and function. it was simply a tool that did its job well, and reliably. Boringly. The 6X10 gives it a kick in the @ss. I think I'll need to build a new bike around this motor, to take fulll advantage of it.
