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Calculating permissible tractor mass and permissible trailer mass on the basis of the D value
EC-approved, dynamically tested trailers are always provided with a D value. This is calculated as follows:
D =
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G * A * B
A + B |
, where
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| D = |
D value of trailer |
| G = |
Gravitational constant 9.81 m/s2 |
| A = |
Tractor mass |
B =
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Trailer mass
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To calculate trailer mass for a given D value and a given tractor mass, and to calculate tractor mass for a given D value and a given trailer mass, use the following formulas:
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Tractor mass
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A =
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D * B
(G * B) - D |
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Trailer mass
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B =
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D * A
(G * A) - D
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Example of how to calculate permissible trailer mass:
| Given that: |
D value, D = 55 kN = 55000 N |
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Traktormasse A = 7000 kg
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B =
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55000 N * 7000 kg
(9.81 m/s2 * 7000 kg) - 55000 N
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= 28163 kg
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Pay close attention to permissible towed mass and tractor mass!
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