"@LT-1, @Athos - Actually, straight cut gears are not stronger than helical cut gears. They are slightly more efficient at transferring power. But the main reason they are used in race cars is that they don't produce any axial loads (thrust loads). You can easily build strong gears that are either straight cut or helical, so that's not the problem. The problem is when you start putting a lot of torque through helical gears, the axial loads become so high that you need a very strong…"
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