Regenerative braking efficiency versus speed (Part TWO)

In the previous post (“Regenerative braking efficiency versus speed (Part ONE) “) I have published the results of the tests performed with my Low Racer Tilting Trike (‘LRTT’)

To push furher the analysis I have collected here a new complete set of tests.

Here are the 2 changes I have introduced:

  • FAIRING: The bike is ‘partially faired‘ (last time there was no fairing on the bike)
  • RANGES OF SPEED:I have extended the range of reference ‘max speed’ as follows:
    • 20 km/h
    • 25 km/h
    • 30 km/h
    • 35 km/h
    • 40 km/h

This is the ‘partial fairing’ version of the LRTT I have used for this set of tests.

completed rear fairing 2

This is the visual summary of this set of tests: here below are the main conclusions we can derive from these data.

regenerative braking graphic


  1. The speed at which the regenerative braking produces more electricity is 25 km/h with 0,51 A/h [best case in this test set] : this is slightly more than with 20 km/h max speed (0,50 Ah)
  2. With higher speed by using regenerative braking we recuperate less energy: at 40 km/h we have produced ‘only’ 0,26 Ah [worst case in this test set]
  3. Increasing speed from 25 km/h to 40 km/h represents a “regen loss” of 50%!
  4. Similarly if we increase speed from 25 km/h to 30 km/h, this represents a “regen loss” of 17%, while from 25 km/h to 35 km/h we have a “regen loss” of 27%
  5. When we compare the results from previous set of tests (performed WITHOUT any fairing) we can see significant improvements :
    1. At 25 km/h from 0,43 Ah to 0,51 Ah
    2. At 30 km/h from 0,39 Ah to 0,42 Ah
    3. At 35 km/h from 0,3 Ah to 0,37 Ah

Here are the data as displayed on the Cycle Analyst for each of the tests at the end of the descente:

  • At 20 km/h
Regen 20 km/h
  • At 25 km/h
  • At 30 km/h
Regen 25kmh
Regen 30 kmh
  • At 35 km/h
  • At 40 km/h
Regen 35 kmh
Regen 40 kmh

This Post Has 2 Comments

  1. Philippe Valdenaire

    Merci pour votre accueil de samedi

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