CIRRUS System

AERODYNAMIC DRAG MEASUREMENT

The CIRRUS Aerodynamic Drag Measurement System

The CIRRUS system allows cyclists, coaches, and manufacturers to test their aerodynamics quickly and precisely. Unlike wind tunnels, CIRRUS allows for real-world testing, eliminating the need for travel and expensive hourly rates.

Achieving accurate and consistent results is simplified through our innovative system, which automates the complex process of calibrations and calculations. With our web portal, all necessary calculations are performed automatically, providing the user with reliable, easy-to-understand results.

A simple, intuitive outdoor aerodynamic drag measurement system that automates the testing process, allowing users to focus on what really matters – data-powered performance improvement.

Our simple 3-step process to real world aero testing

1

Set Up

CIRRUS requires a bicycle with a power meter. The system then adds on three extra sensors ALTOSTRATUS (for wind speed, direction and altitude), FORMA (for body position), and our wheel speed sensor.

2

Ride

The cyclist rides along a course with less than 1% gradient, for approx 600m to 1000m. Ideally, the course needs to be relatively straight and free from too many bumps or obstructions - cycle paths and local roads are usually suitable.

3

Result

As they ride, data collected from the sensors is stored on a data logger, and then uploaded to the cloud system. Precise aerodynamic drag measurements from the sensors can then be instantly viewed on the portal.

Results & Data Analysis

CIRRUS Portal

• Performs all calibrations and calculations required for precise aerodynamic drag measurement seamlessly and automatically so that users can focus on improving performance

• Delivers precise and simple data in a clear layout - no need for technical knowledge

• Allows comparison of data between multiple rides

• View if implemented changes are improving or degrading performance quickly

Wind Sensor

ALTOSTRATUS

Our patented four port sensor design measures wind speed with 0.2% accuracy, wind direction with 0.1 degree precision, altitude, and air density. Accurate aerodynamic drag measurement can be taken in almost any wind conditions that are safe to cycle in. In addition, the pressure sensors in the probe are designed to eliminate any water ingress.

Road gradient is measured through matching multiple barometric measurements with GPS locations, providing a precise elevation profile along the course. Undulations and mild gradients are measured and accounted for, allowing for a greater availability of test locations.

Body Position Sensor

FORMA

About 75% of a cyclists drag comes from the rider’s body position. The FORMA body position sensor consists of three infrared lasers which measure a cyclist’s head and chest position on the bicycle, ensuring that any movement that takes place while the rider is testing can be accounted for. Real-time visual feedback from the sensor is fed back via the Streamlines app, which runs on most Garmin bike computers.

The FORMA is also available for purchase separately.

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Speed Sensor

TEMPO

Our proprietary wheel speed sensor measures time to the microsecond level. This greater precision is instrumental to the CIRRUS system drag measurement overall accuracy. The TEMPO is also at least ten times more accurate than other existing speed sensor market options.

Why Choose CIRRUS

Essentially, the CIRRUS system has optimised the entire aerodynamic testing process, from start to finish, so that riders, coaches, fitters and manufacturers can perform multiple end-to-end tests in as little as two hours, even in windy conditions.

The portal interface allows the user to see simple and clear data that highlights performance improvements (or degradations) without needing any understanding of the calculations and automatic calibrations happening behind the scenes.

What's Included:

• ALTOSTRATUS Wind Sensor

• FORMA Body Position Sensor

• TEMPO Speed Sensor

• NIMBUS Data Logger

• Access to CIRRUS Portal

Request Commercial Information

If you are interested in the CIRRUS system and would like to learn about our B2B lease deal, please fill the form bellow and we will get in touch with you. Alternatively you can email us to request a brochure and more information at commercial@streamlines.aero