32
Test flight
If the sprogs are set too low, it may cause 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 reduc-
tion 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, and adverse yaw. 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. In particular, do not assume that adequate stability is only contingent on
positive pitch pressure during flight testing. However, in the case of the Fusion, excessive top steady
state speed with pilot full forward is a significant indicator that the sprogs may be set too low. If you
can maintain a steady state speed of more than 60 mph indicated in a normal pilot full forward body
position, you should check and re-adjust your sprogs as necessary.
We have found that due to the high loads imposed on the sprog cables and hardware, the
sprogs will tend to lower themselves significantly over time. It is therefore very important,
in order to maintain pitch stability compliance, that sprog adjustment should be monitored
and adjusted throughout the life of the glider using the procedures described above.
Summary of Contents for Fusion 141
Page 1: ...Fusion 141 and 150 Owner Service Manual October 15 1998 Third Edition ...
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Page 68: ...Wills Wing 500 West Blueridge Orange CA 92865 Page A 16 Fusion Assembly Diagrams October 1998 ...
