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Note: The inner bridles can be slightly tight without having an adverse affect on glider han-
dling. It is acceptable especially on the 154, for the inner bridles to be snug or even tight
even at VG loose setting, if there is no adverse affect on handling and if the glider meets the
pitch bar pressure criteria as explained.
While it is normal on the 154 for the inner bridles to come tight at some point in the VG
range, the middle and outer bridles should never become tight. If either the middle or outer
bridles come tight at any point in the VG range, there will be a sudden and dramatic in-
crease in pitch pressures and a sudden and dramatic reduction in trim speed at all VG
settings tighter than this, along with a severe increase in roll control bar pressures and a
severe slowing of the roll rate. A gradual and progressive slowing of the trim speed, and
reduction of roll control as the VG is tightened is normal.
If the bridles are set too loose, in addition to reduced pitch pressures in the normal flight
range, 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.
Other factors of glider geometry which affect bridle adjustment and
effectiveness:
The effective adjustment of the bridles is also affected by other aspects of the glider geom-
etry. For example, if the bottom side wires are too long, it will allow the wings to rise and
slacken the bridles in normal flight. If they are too short, it will pull the wings down, and
tighten the bridles in normal flight. Improper attachment or routing of the bottom side wires
at the leading edge crossbar junction (bolts overtightened and tangs not aligned with the
direction of wire pull) can effectively shorten the bottom side wires and tighten the bridles.
If the top side wires are too short, it will reduce the amount the wings can “fold” downwards
as the glider unloads at low angles of attack, thereby reducing the effectiveness of the
bridles.
Changes from proper length to the top or bottom side wires will also change the relative
adjustment of the inner, middle, and outer bridles to each other, and change the way they
operate.
Changing The Upper Compensator Wire
In order to correct an improper bridle adjustment at the VG tight setting on the RamAir 154,
it is necessary to change the upper compensator wire with one having a different pigtail
length, as described above. Use the following procedure:
1) Position the glider flat on the ground with the wings
completely
spread but with the
crossbar sweep wire
not
attached.
2) Dismount the nylon pulley from the rear of the crossbar sweep wire keyhole bracket, thus
detaching the keyhole bracket from the accessory cord / bungee return system.
3) Remove the kingpost top cap, and disengage all of the cable balls from the kingpost top
insert.
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