Specifications and Weight Saving - Electric Motorcycle : Design : Engineering : Manufacture : Assembly
The calculations for a drag racing bike show three things.
1] as velocity and acceleration forces increase, the force neede to overcome drag rises rapidly.
2] aerodynamics and frontal area are critical to reducing the forces required
3] excess weight carries a huge penalty.
I can't change the first item - the speeds and velocities are what I'm aiming for so I can't reduce them. With the second one in mind I'm hoping the aero package will smooth it out as far as I can. For the third one I'm saving as much weight as possible, including finding a lightweight rider!
With regard to the performance, we are using the following:
Motors: Twin 72v Agni 95R motors: nominally 26Kw and 55Nm torque @ 400Amps each motor running at 92V = 68Kw (90Hp) and 110Nm
Batteries: 40 x 5Ah 18.5v 20-30C LiPo cells in 8P5S package = 40Ah (800A at 20C) at 92.5v UPDATE! New Turnigy Nano-Cells being investigated
The table below shows how we're doing with weight saving as I remove standard parts and replace (if needed) with lighter bits.
| Weight loss (kg) | Weight gain (kg) |
|---|
| Wiring loom | 3.0 | |
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| Instruments | 1.5 | |
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| Carburettors | 3.5 | |
|---|
| Starter motor | 2.0 | |
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| Exhaust | 5.5 | |
|---|
| Engine | 65.0 | |
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| Petrol tank | 5.0 | 1.0 |
|---|
| Fairing | 2.0 | 1.5 |
|---|
| Headlight | 0.5 | |
|---|
| Handlebars | 2.5 | 1.0 |
|---|
| Rear light/mudguard | 2.5 | |
|---|
| Seat unit | 3.5 | 1.5 |
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| Footrests/brackets | 2.5 | |
|---|
| Sundry brackets | 2.0 | |
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| Electric motors | | 22.5 |
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| Batter Pack | | |
|---|
| Motor Controller | | |
|---|
| Battery Management System | | |
|---|
| Wiring | | |
|---|
| Motor Mount plates | | 4.0 |
|---|
| Totals | 101.0 | 31.5 |
|---|
Saving... | 69.5kg (33%) |
|---|