# Calculator EN

parameter value Unit comments
Drive Calculator

transmition / use of energy under consideration of air drag and friction
Parameters
tyre diameter mm tyre diameter (e.g. Trampa stickies 83x52mm)
motor pulley teeth's teeth on motor side
slave wheel teeth's teeth on wheel side
motor value
 Motor KV max cells max current power at max cells (S) battery chosen
 Type KV Cells A W W
Motor selection

battery choise calculator
 Serial cells Parallel cells nominal voltage charge cut-off voltage discharge cut-off voltage max current capacity of battery pack energie of battery pack
 Manufactur Serial Cells (S) Palrallel cells (P) V V V A(Peak) Ah Wh
type of battery, cell count, maximum voltage, peak current
drive power % throttle
adversities
weight setup kg weight of rider + board
pp hill climb % ascent in %

Baldwin Street = 35% (world's steepest street!)
Results
speed Km/h speed calculated
power W power usage from battery
current A current limited by Imax
drive duration minute ride time
distance Km ride distance

additinal energy

for acceleration
 seconds W A
acceleration duration to reach Vmax

additional power needed for acceleration

additional current at acceleration phase
ADVANCED ⇓⇓⇓ ⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓  ⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓ ⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓
Imax A maximum current limited by: battery, balancer, ESC limit, motor limits
Ibase A current used for electronics
n

coeficient of performance
% coefficient of performance including motor, electrical system and mechanical losses
air resistance
p kg/m3 air density at 20°C
cw   air resistance of a human at 45° angle towards direction of travel
surface surface of a human

frictional resistance
cr
frictional resistance (wheel on concrete 0.01) use higher value for other surfaces like sand (0.5) etc.

Calculation     F means force;
F flow resistance N resistance air
F sloping N F climbing
F roll resitance N force wheels
F overall N summ of all forces
P W motor power needed

RPM Motor RPM RPM motor
RPM wheel RPM RPM wheel
gear ratio 1:x gear ratio
torque Nm torque motor
torque Nm torque wheel

losses and voltage sag
 losses motor losses battery voltage sag battery
 W W V