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The function of the system is to support the trailing edge of the sail at low angles of attack, and thus to provide a nose
up pitching moment. The sprogs are adjusted at the factory to their proper settings.
SPROG MEASUREMENT
The sprog angles are very critical for modern hang gliders and should be checked regularly. The sprog angles can be
checked with any digital electronic angle meter.
1. Set the VG to full tight.
2. Rest the keel tube on a support and using the angle meter as shown on the figure 37 and set the keel tube
horizontal (0 deg. on the angle meter). This angle has to be maintained during further measurements.
Figure 37
Figure 38
3. Fully open the sprog access zipper. Place the worktop of the angle meter under the middle part of the sprog so
that the entire worktop surface of the angle meter touches the sprog.
The scale of the angle meter will show the sprog angle (Fig.38).
Sprog angle
Combat-C 12.7
Combat-C 13.5
Main sprogs, deg
6.2
5.0
Outboard sprogs, deg
7.2
6.5
METHOD OF SPROG ADJUSTMENT
To adjust the outboard sprog height:
1. Fully unzip the access zipper to gain access to the sprog-LE tube connection (Fig.39).
2. Remove the pin from the sprog threaded adjuster at the front of the sprog. To raise the sprog, turn the end of the
sprog threaded adjuster counter clockwise. To lower the sprog, turn it clockwise.
3. Re-install the pin to the sprog threaded adjuster, zip the access zipper and press down firmly on the rear end of the
sprog to seat the cable before checking the measurement again.
Figure 39
Figure 40
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