Blades-on Scale Factor Calibration
These directions require that you have already assembled, charged, and configured your power meter shaft. All necessary steps are covered in the Getting Started section.
1. Place the paddle onto the calibration jig
Place the paddle onto the calibration jig, note if the left or right shaft is being calibrated.
The blade should be supported near its centre.
The shaft support should be approximately at the top hand position.
2. Measure distances and weights for calibration
We recommend all lengths are recorded using millimetres, and weights using kilograms.
tipToDatum: The distance from the blade tip to the datum of the shaft being calibrated.
weight1, weight2: The weight is measured in kilograms. Weight one will be lighter than weight 2. For reference, when we calibrate in the workshop we use 13kg for weight 1, and 26kg for weight 2.
datumToDatum: The distance between both datum points.
tipToBlade: The distance between the blade tip and the blade support.
tipToShaft: The distance between the blade tip and the shaft support.
tipToCalWeight: The distance between the blade tip and the location of the calibration weight hook.
3. Enter measurements into the calibration URL
We'll need to take those measurements you just recorded and plug them into our calibration API via a special URL. The URL will look similar to this when we are done.
https://app.onegiantleap.co.nz/calibration?shaft=right&tipToDatum=0.9&weight1=10.6&weight2=15.9&datumToDatum=0.3&tipToBlade=0.2&tipToShaft=1.4&tipToCalWeight=0.7
The URL will always begin with : https://app.onegiantleap.co.nz/calibration?
The rest of the URL will need to be modified with your measurements from the previous step. The URL is sectioned into 'Key:Value' pairs, we have supplied the keys, you just need to enter your measurements as the values. Follow the table below if you need help.
All lengths are entered as metres, all weights are entered as kilograms
Key | Value |
shaft= | left, right |
&tipToDatum= | your tipToDatum length |
&weight1= | your weight1 weight |
&weight2= | your weight2 weight |
&datumToDatum= | your datumToDatum length |
&tipToBlade= | your tipToBlade length |
&tipToShaft= | your tipToShaft length |
&tipToCalWeight= | your tipToCalWeight weight |
All together your specific URL will look similar to the one below, all the value locations with your measurements are bold.
https://app.onegiantleap.co.nz/calibration?shaft=right&tipToDatum=0.9&weight1=10.6&weight2=15.9&datumToDatum=0.3&tipToBlade=0.2&tipToShaft=1.4&tipToCalWeight=0.7
4. Connect using your specific URL
Connect to your power meter to our Web App via Bluetooth.
Enter your modified URL into the browser address bar and refresh.
5. Record the Zero weight values
Now we are all set to start recording our calibration data. First, we have to record a zero weight calibration. Before attaching any weight, click the 0 on the left-side of the fourth row from the top, shown below in the yellow box. This should update the fourth row with values in the A, B, and C columns, shown below in the purple box.
6. Record the weight 1 values
Attach the first set of weights (weight1) at the location designated in your earlier measurements. The first thing you should notice is a slight increase in the Output row values. To record these values we just click the weight1 value on the left side of the fifth row from the top(yellow). In the screenshot below, the weight1 value is 12.69. After a successful click, the weight1 values for the A, B, and C columns should all be updated(purple).
7. Record the weight 2 values
Attach the second set of weights (weight2) at the same location as weight1. Check there is a slight increase in the Output row values. Click the weight2 value on the left side of the sixth row from the top(yellow). In the screenshot below, the weight2 value is 25.37. After a successful click, the weight2 values for the A, B, and C (purple) columns should all be updated.
8. Check the values and remove the weights
Double check that all the weight values have been stored properly in the Zero weight, weight1, and weight2 rows. Then go ahead and remove any weights that are still attached.
9. Update the Scale Factor values
Now that you have all the values necessary for calibration, you'll need to update the scale factor. First, last check all the numbers look right. The R² row, fourth from the bottom (orange), should show the value of 1 for the A, B, and C columns. If everything looks good, click the Scale F. (yellow) text on the left side of the fifth row from the bottom. This will update your current scale factor values (purple) and ensure your power meter is calibrated and accurate for use.
If your R² values don't display properly, or if there are any other issues encountered during the calibration, please contact us at support@onegiantleap.co.nz . Be sure to include a screenshot of your calibration and a brief explanation.
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