Aeros Combat-12.4-GT, Owner'S Service Manual

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Sprog angle Combat 13.5 GT Combat 12.7 GT Combat 12.4 GT
(BHPA)
Main sprogs, deg 2.8 (DHV), 4.2 3.8 (DHV), 5.0 4.3, 5.0
Outboard sprogs, deg 4.0 DHV), 4.7 5.8 (DHV), 6.0 5.2, 6.0
METHOD OF SPROG ADJUSTMENT
Figure 40
To adjust the outboard sprog height:
1. Fully unzip the access zipper to gain access to the
sprog-LE tube connection. (
Fig. 40)
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 41
To adjust the main sprog height:
1. Fully unzip the access zipper to gain access to the
Crossbar - LE junction (
Fig. 41).
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 on 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.
TEST FLIGHT
If the sprogs are set too low, it may cause a significant increase in trim speed and a reduction in pitch pressures at
tighter VG settings, and there will be a reduction in pitch stability at angles of attack below normal flight. This stability
reduction could increase the probability of a turbulence-induced tumble or other in-flight stability related loss of
control. If the sprogs are set too high, it may cause excessive pitch bar pressure at high speeds, and excessive roll
control pressures, lag in roll response.
Please be aware that flight-testing encompasses a very limited angle of attack range and that there is no correlation
between pitch stability in the flight test envelope and pitch stability in the extended angle of attack range that is
investigated on a test vehicle.
WARNING
This test is best performed by a qualified test pilot, and, in any case, should be performed only in
smooth air and with caution.
TURN CORRECTION
Turns are caused by an asymmetry in the glider. If you have a turn, first try to make the glider symmetrical in
every way. If a turn appears only at VG settings of 3/4 to full tight, it may be an indication that the sprogs are set
asymmetrically.