180 Degree Turn
| Rule Book
180 DEGREE TURN The plane
starts in straight and level flight, pulls up
into a vertical climb, rolls 90 degrees,
performs half of an outside loop, rolls 90
degrees in the opposite direction to the first
quarter roll and pulls out at the same altitude
but with a 180 degree heading change.
Downgrades:
Entry not
straight and level
Pull up is not to exact vertical climb
Roll is more or less than 90 degrees
Path of roll is not straight vertical line
Half outside loop deviates left or right
Half hoop is not smooth and round
Second 90 degree roll path is not straight
vertical line
Pull out to level flight is sudden or jerky
Pull out is not to same altitude and 180 degrees
opposite heading
Plane fails to perform straight and level flight
at end to entry of maneuver |
This
description was approved by the SPA Board
March 23, 2009
Entry
and exit lines should be on heading and level until the
maneuver is called complete.
Down
grades will be 1 point for each 15 degrees the line is
off. If it were going up 15 degrees and 15 degrees away
from being horizontal with the flight line, it would be
a 2 point down grade.
The
picture is not quite correct. The bottom radii shown are
not the same size as the one across the top. The radius
of the three areas marked (Z) should be the same.
For example, if you pull up sharply the 1/2 outside loop
and the exit radius should be the same.
Down
grades for the radius:
You have three radii to fly, the entry, the 1/2 loop and
the exit. Depending on the severity of the difference
between the three. the down grades should be from 1/2
point to 2 points per incident.
If the first one is a smooth 1/4 loop taking 100 feet,
the 1/2 outside loop takes 200 feet and is smooth, these
two would be pretty much identical so no down grade
here. if the exit 1/4 loop is squared off, and only
takes say, 40 feet, the down grade would be 2 points, it
were such that it took 75 feet then the down grade would
be 1/2 point. This is a judgment call as you view the
maneuver.
Please note
on the vertical
1/4 roll in the two areas
marked (Y), there is
NO vertical straight line.
The roll starts as soon as the plane is vertical and the
1/2 outside loop starts as soon as the 1/4 roll is
complete. Likewise the down line 1/4 roll starts as soon
as the plane is vertical
The
center of the maneuver is located where the model starts
the first ¼ loop. See the picture.
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information.
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