Electric Motorcycle built from scratch.
At 92 lbs without battery, 115 lbs with battery (53 kg) (the specifications of some electric motorcycles and bikes are given without batteries, not very practical) fully dressed with accessories and large tires. It's easy to put it in a peakup box on its own without ramps.
It is therefore the weight of a 50cc mini motorcycle for children, but it is of average adult size.
The balloon tires make it easier to roll on rocky ground and soft ground. Well tested on my gasoline motorcycle.
The 1.9 kW/h battery is made of 18650 Samsung cells, which is much lighter than a Lipofe battery (virtually all motorcycles are Lipofe). But it was very difficult to find in this format, several battery suppliers only take orders for very large customers. Purchased in China but with reputable Korean cells (not Chinese cells which have an advertised capacity 3 times greater than reality)
The Brushless motor with the battery and the controller should give 5kW of power between 1600 and 4200 RPM mechanically at the output of the motor axis. The peak power announced by the sellers of motors and electric vehicles means nothing most of the time, it represents the electrical power that the motor could absorb at start-up (if there were no restrictions) and not the power that is produced...
And 25lbs/ft of torque at 1500rpm.
The KTM Freeryde E electric motorcycle has about double the power, battery capacity, but also double the weight.
Since there is no transmission, the vaunted torque of the electric motor does not provide such a violent start, there is no overdrive ratio of the first gear and the clutch has an X speed. The speed start is 0RPM
It should be roughly equivalent to a 10 hp gasoline motorcycle, but ultra light.
More precision, comparison to the summer. Preliminary tests have shown that its reached (60km/h GPS) very quickly. (speed limited by the ratio of the chain. An electric motor being limited to a speed X, if you want a lot of force and acceleration on rough terrain you have to stick to a lower speed. Precision control is incomparable to that of gasoline at low speed.There will be almost no adjustment and maintenance to do, except that it will still get dirty.
Estimated range
Energy contained in 1 liter of gasoline = 8.9kwh
Approximate average efficiency of an air-cooled 4-stroke engine = 20%
Approximate average efficiency of a brushless electric motor = 90%
Therefore
8.9kwh*20%/90%=1.98kwh
A 1.98kw/h battery with a small brushless motor would give the equivalent in autonomy of 1 liter of gasoline with the small 4-stroke motor. Perhaps more considering the lightness and low friction of the bike, to see. But it can for the weight and price of the battery.
Theoretically the end of useful life of the battery would arrive at the same time as the equivalent in $ of a full tank of gas. As I would use the vehicle (or my girlfriend hence the color) very occasionally, this will never happen.
Front and rear suspension with 6” of air travel.
Almost waterproof battery and controller compartment.
Chest under the seat, removable seat, rear luggage rack.
Large wings to avoid mud in the face and in the back
Hydraulic brakes with battery regeneration during braking
The chain guard allows at the same time to keep the tension of the chain according to the sag of the suspension.
There are not many games, the battery (found after building the frame) just fits, the brake is 1mm from the rims, the motor fits tight, there must not be any looseness
At 92 lbs without battery, 115 lbs with battery (53 kg) (the specifications of some electric motorcycles and bikes are given without batteries, not very practical) fully dressed with accessories and large tires. It's easy to put it in a peakup box on its own without ramps.
It is therefore the weight of a 50cc mini motorcycle for children, but it is of average adult size.
The balloon tires make it easier to roll on rocky ground and soft ground. Well tested on my gasoline motorcycle.
The 1.9 kW/h battery is made of 18650 Samsung cells, which is much lighter than a Lipofe battery (virtually all motorcycles are Lipofe). But it was very difficult to find in this format, several battery suppliers only take orders for very large customers. Purchased in China but with reputable Korean cells (not Chinese cells which have an advertised capacity 3 times greater than reality)
The Brushless motor with the battery and the controller should give 5kW of power between 1600 and 4200 RPM mechanically at the output of the motor axis. The peak power announced by the sellers of motors and electric vehicles means nothing most of the time, it represents the electrical power that the motor could absorb at start-up (if there were no restrictions) and not the power that is produced...
And 25lbs/ft of torque at 1500rpm.
The KTM Freeryde E electric motorcycle has about double the power, battery capacity, but also double the weight.
Since there is no transmission, the vaunted torque of the electric motor does not provide such a violent start, there is no overdrive ratio of the first gear and the clutch has an X speed. The speed start is 0RPM
It should be roughly equivalent to a 10 hp gasoline motorcycle, but ultra light.
More precision, comparison to the summer. Preliminary tests have shown that its reached (60km/h GPS) very quickly. (speed limited by the ratio of the chain. An electric motor being limited to a speed X, if you want a lot of force and acceleration on rough terrain you have to stick to a lower speed. Precision control is incomparable to that of gasoline at low speed.There will be almost no adjustment and maintenance to do, except that it will still get dirty.
Estimated range
Energy contained in 1 liter of gasoline = 8.9kwh
Approximate average efficiency of an air-cooled 4-stroke engine = 20%
Approximate average efficiency of a brushless electric motor = 90%
Therefore
8.9kwh*20%/90%=1.98kwh
A 1.98kw/h battery with a small brushless motor would give the equivalent in autonomy of 1 liter of gasoline with the small 4-stroke motor. Perhaps more considering the lightness and low friction of the bike, to see. But it can for the weight and price of the battery.
Theoretically the end of useful life of the battery would arrive at the same time as the equivalent in $ of a full tank of gas. As I would use the vehicle (or my girlfriend hence the color) very occasionally, this will never happen.
Front and rear suspension with 6” of air travel.
Almost waterproof battery and controller compartment.
Chest under the seat, removable seat, rear luggage rack.
Large wings to avoid mud in the face and in the back
Hydraulic brakes with battery regeneration during braking
The chain guard allows at the same time to keep the tension of the chain according to the sag of the suspension.
There are not many games, the battery (found after building the frame) just fits, the brake is 1mm from the rims, the motor fits tight, there must not be any looseness
