Contents

1. CIRRUS Hardware
   1. Hardware User Guides
2. Aero Testing Overview
3. Portal Set Up
   1. Intro
   2. Riders
   3. Calibrations
4. Test Creation
   1. Sessions
   2. Configs
   3. Configs & Runs During Test
5. NIMBUS App
6. Courses and Gates
7. Performing Tests
8. Important Safety Information

CIRRUS Hardware

Hardware User Guides

For more information on the CIRRUS hardware, please refer to the following user guides:

• ALTOSTRATUS User Guide
• FORMA User Guide
• TEMPO User Guide

Aero Testing Overview

The purpose of aerodynamic testing is to assess and compare aerodynamic characteristics and performance. Whether in a windtunnel, velodrome, or on the road, organisation and precision are of the utmost importance. The CIRRUS portal uses a test structure with a basic hierarchy:

• Session
• Configs
• Run
• Traverse

This structure simplifies the organisation of the test, and ensures that the equipment and underlying performance calculations are applied in the appropriate manner.

Until one establishes a certain level of expertise and understanding, we strongly recommend that all tests use this session structure. It will result in a vastly more coherent and rewarding user experience.

Portal Set Up

Intro

Login into the portal using the credential you received via email.

Rider and default calibration are only needed when adding a new rider

If the rider already exists in the system, skip to 'Sessions'

Riders

Create new or select existing rider

1. To create a new rider select the 'Riders' tab, then press '+' on the upper right
2. Nickname is mandatory and must be unique within the team, display name will be created automatically
   
3. Input the approximate mass of the rider without the bicycle (+/- 3 kg)
   
   The precise combined mass of rider and bicycle for the calculation will be entered later
4. Save

Calibrations

This calibration will be the starting template for all future test sessions with this rider, all parameters can be update at any time (even after a test is complete).

1. To create a default calibration for this rider go to the 'Calibrations' tab, then press '+' on upper right
2. Write '[Rider Name - Default Calibration]' on the 'Description' field
3. Leave 'Tags' field blank for now
4. Select 'Default Calibration Values' from the 'Select Calibration' drop down menu
5. Save & Exit

Test Creation

Sessions

1. To create a session select 'Session' tab, then press '+' on upper right
2. Input date and rider name
3. Alter description if needed elect
4. Select 'Default [Rider Name] Calibration' from drop down menu
5. Save

Configs

Add configurations to the sessions

1. Highlight the desired session then click on the ellipsis on the right side and select 'Edit Details'
2. Add configs using the 'New Config' button
3. Add the number of runs for each configuration using '+' and '-' buttons

Configs and runs can be added while testing or afterwards. However, testing is easier if a basic test plan is created beforehand.

Configs & Runs During Test

1. Baseline configuration will be automatically selected for the first run
2. The server will always automatically populate the next available run in sequential order. The symbol denotes the next run to be populated.
   
   
   
   For example, if the first 2 out of your 3 runs on configuration 'A' have been populated and you now select configuration 'B', the next run to be populated will be the first run on configuration 'B'. This run will be automatically assigned run number '3'.


3. Other configs can be selected by pressing the symbol to the right of the config. This can be done easily on a mobile phone during testing.
4. To edit a run, press the symbol on the right.

NIMBUS App

The NIMBUS App will come installed in the data logger device.

1. Turn on the data logger phone supplied. Ensure data connection is enabled.


2. Start the NIMBUS app


3. On the start up screen, go to Setup
   
   
   
   
   
4. Expand the Sensors section





5. Select Connections





6. To connect the power meter and speed sensors, press ANT+

After devices appear, select each one and press Connect






7. To connect the wind and body position sensors, press SL Scan

After devices appear, select each sensor and press Connect





8. All sensors should now show as 'TRACKING'





9. If all the sensors have been successfully connected, the Setup screen should now show a next to Sensors

Courses and Gates

Course layout should be similar to the one on the diagram below.

Mark the Gates

1. Find suitable spot for gate 'A'
2. On the NIMBUS app start screen, select Setup
3. In the next screen, expand the Gates section, then select Set Gates




4. 'Set A' while at gate 'A'




5. Repeat process for gate 'B'

Please note that the order in which you mark the gates is not important. Rider can start course at gate 'B' if desired.

Zeroing the Sensors

1. Zero the power meter using a suitable head unit
2. Zero the wind sensor using the NIMBUS app
1. Display Main Menu> Other Displays> Wind Sensor
2. Shield, but do not block, sensor ports with hand or body (if outside)
3. Press Measure
4. Press Apply
5. Diff1, Diff2 & Diff3 pressure readings on right-hand column should read between 0 and 1

Performing Tests

1. Start NUMBUS app (see NIMBUS app section)
Ensure sensors are connected and zeroed
2. On the start screen go to Test, then press Start Log to start logging your test




3. Ride at constant power through gates 'A' to 'B' and return 'B' to 'A'.
4. You can press the Lock Screen button to ensure you don't accidentally press any buttons during testing. To unlock the screen, press the Lock Screen button 3 times in quick succession.

Important Safety Information

WARNINGS:

• Pay attention to your surroundings and use your best judgement to ensure you always operate the bicycle safely.
• Before turning around after completing a traverse, we strongly recommend that the rider comes to a complete stop and ensures that no vehicles are behind them.
• Your bicycle and hardware should be properly installed and maintained at all times.
• The use of LED lights is always recommended during testing.

STREAMLINES AERO LTD.

© 2025 Streamlines Aero Ltd. All rights reserved.

The Streamlines logo, CIRRUS, and the CIRRUS logo are trademarks of Streamlines Aero Ltd.

Streamlines Aero Limited

62 Temple Road, OX4 2HB

Oxford - United Kingdom

www.streamlines.aero

Other company and product names mentioned herein may be trademarks of their respective companies.

Every effort has been made to ensure that the information in this manual is accurate.