Current list of Aerodynamic based calculators:

-Drag Force and HP Losses

Current list of Transmission based calculators:

-Gear Ratio Table

Current list of Suspension based calculators:

-Damper Graphing Tool

-Step Response Calculator

-Weight Transfer Calculator

Current list of Wheels & Tires based calculators:

-Information on Tire Sizing

-Overall Diameter Calculator

Current list of Unit Coversions:

-inches <==> mm

-lbs <==> kg

-lbs <==> N

-lbs/in <==> N/m

-mph <==> kph

-hp <==> kW

motomathics

Select a subsystem below to get started!


AERODYNAMICS

wind_tunnel

Drag Calculator:

-Enter values below. An example vehicle model is in place as a starting point.
-Coefficient of Drag and Reference Area are vehicle specific.
-Air density and speed are case specific. The current air density value is that of sea level at 15° C.
-Be sure to watch your units!

Drag Force(N):

Drag Force(lbs):

Power Loss(kW):

Power Loss(hp):

TRANSMISSION

trans

Gearing Calculator:

-Enter values below. An example vehicle model is in place as a starting point.
-Be sure to check out the "Wheels/Tires" page to get the correct tire diameter!
-Also, power losses from drag can be calculated on the "Aerodynamics" page at the speeds calculated below!
-RPM inputs can be minimum and maximum engine RPMs or "Power-Band" RPMs.
-Explore different shift points by altering the "Power-Band" and watching for speed overlap between gears.
-Gear ratios entered are the output to input ratio with input as "1". For example, first entry ratio is "4.1:1".
-If a gear doesn't exist, enter "0" and that gear's line will appear on the RPM axis only.
-Be sure to watch your units!
RPM = Revolutions per Minute
KPH = Kilometers per Hour
Min. = Minimum
Max. = Maximum
Prim. Red. = Primary Reduction
Tire Dia. = Tire Diameter(m)

Damper graphing tool for known low and high speed coeffficient goals, as well as a knee speed (transition point).

Step response analysis of either a quarter model (car) or half model (motorcycle).

Weight transfer calculation tool for accelerating, braking, or cornering inputs.

SUSPENSION

suspension_parts

Suspension Calculations:

SUSPENSION: Damper Graphing Tool

Damper Graphing:

-Enter values below. An example vehicle model is in place as a starting point.
-Be sure to check out the "Step Response Calculator" to sync front and rear!
-Be sure to watch your units!
Comp. = Compression
Reb. = Rebound
HS = High Speed
LS = Low Speed
KS = Knee Speed
Damp. C. = Damping Coefficient

Notes about Suspension Step Response:

-A step response analysis is a transient, or time dependent, one.
-Traditionally, the goal is to analyze the front and rear reactions to sync the front and rear response for vehicle ride feedback and control.
-With different speeds and inputs, or different track conditions, the ideal setup varies. Multiple conditions should be analyzed for a balanced setup.
-At an excessively low % of critical damping, with split compression and rebound values, error propagates into the solver towards the end of a relatively long time span in the form of an unbound response. Make sure to match compression and rebound values if this is an issue. Analyses within typical ranges of suspension setup do not have this issue.
-A relatively long timespan reduces the resolution of the calculations, leading to error propogation. Analyses within typical timespans do not have this issue.
-Use the link below the graph to see the raw data. This data can be copied and pasted outside of the app for further analysis or reporting.

Time Step:

Front Data:

Rear Initial Time:

Rear Data:

SUSPENSION: Step Response

Suspension Step Response:

-Enter values below. An example vehicle model is in place as a starting point.
-This calc is used to analyze the step response of either a 4 wheeled vehicle (front and rear quarter models), or a 2 wheeled vehicle (front and rear half models).
-Be sure to watch your units!
F = Front
R = Rear
Comp. = Compression
Reb. = Rebound
Damp = Damping
More Info Here

Front Natural Freq.(Hz):

Rear Natural Freq.(Hz):

Front Critical Damp(N*s/m):

Rear Critical Damp(N*s/m):

Raw Data Here (for external reports and analysis!)

SUSPENSION: Weight Transfer

Weight Transfer:

-Enter values below. An example vehicle model is in place as a starting point.
-"Weight" units are in kilograms(kg).
-Be sure to watch your units!
WB = Wheelbase
FTW = Front Track Width
RTW = Rear Track Width
CGH = Center of Gravity Height
Lat. G = Lateral G's of Accleration (left +, right -)
Long. G = Longitudinal G's of Acceleration (brake +, accel -)
SW = Static Weight
IW = Instantaneous Weight
LF = Left Front Corner
RF = Right Front Corner
LR = Left Rear Corner
RR = Right Rear Corner

LF IW(kg):

RF IW(kg):

LR IW(kg):

RR IW(kg):

WHEELS/TIRES

Typical Tire Information:

[CLASS] [WIDTH] / [ASPECT RATIO] [CONSTRUCTION] [WHEEL DIAMETER]

[LOAD INDEX] [SPEED RATING]

Example: "P225/40R18 92Y"
P = Passenger Vehicle Class
225 = 225mm Width
40 = Sidewall is 90mm (40% of 225mm)
R = Radial Ply Construction
18 = 18" Wheel Diameter
92 = Capable Load of 630kg
Y = Capable Speed of 300km/hr

Tire Diameter Calculator:

Tire Diameter(mm):

Tire Diameter(in):

ABOUT

-App Version: 1.0
-Follow us on social media for news, upcoming additions, and community discussions!
-Tip: Have your number row to "always show" on your keyboard to speed up inputs!

UNIT CONVERTERS

Select Unit Converter Below:

IMPERIAL TO METRIC

Convert Inches to Millimeters

millimeters:

Convert Pounds to Kilograms

Kilograms:

Convert Pounds to Newtons

Netwons:

Convert Pounds/Inch to Newtons/Meter

Netwons/Meter:

Convert Miles/Hour to Kilometers/Hour

Kilometers/Hour:

Convert Horsepower to Kilowatts

Kilowatts:

METRIC TO IMPERIAL

Convert Millimeters to Inches

inches:

Convert Kilograms to Pounds

Pounds:

Convert Newtons to Pounds

Pounds:

Convert Newtons/Meter to Pounds/Inch

Pounds/Inch:

Convert Kilometers/Hour to Miles/Hour

Miles/Hour:

Convert Kilowatts to Horsepower

Horsepower: