American Water Ski Association
New Jump Driving/Timing
Approved By AWSA Rules Committee
Optional Jumping Timing Tolerance Table
(Acrobat Reader -
jump driving rules have always called for a "constant boat
speed" in the jumping event, and so the associated timing tolerance
tables for our two-segment method of jump timing have been developed
from an assumption that the boat speed throughout BOTH segments of the
timing course will average to the EXACT specified nominal speed.
The advent of Speed Control systems in recent years, and the need
to program these to comply with these rules, has shed more insight on
what really goes on with the boat speed during the jump event.
This has led various committees to recommend changing those
OF THE CONSTANT SPEED ASSUMPTION:
evolution of Speed control devices, has become somewhat complex.
This has included the necessity of a device called a "Jump
Switch", which senses towline tension.
This device serves as a trigger to the speed control system to
apply additional throttle, in order to maintain the desired nominal boat
speed whenever the skier is cutting hard and hence putting a load on the
boat. One significant
byproduct of this operation is that, for any given nominal speed, at the
time the jump switch disengages (when the skier leaves the ramp surface
into flight), the boat speed will surge ahead momentarily, before the
added throttle can be rolled back by the control system.
the boat speed at the beginning of the 2nd jump timing segment will always
– unavoidably -- be somewhat higher than the nominal intended
speed. Then given our
traditional jump timing tables, in order for the speed control device to
deliver an "Ideal" average time in the 2nd timing segment,
then it has been necessary to program it to actually reduce
the boat speed, to a level below
the intended nominal speed, through the remainder of the 2nd segment.
While necessary from that traditional rules perspective, this is
otherwise undesirable, and may actually serve to impede the most
aggressive skiers who have been landing far ahead of the boat.
by a proposal by the Athlete's Advisory Committee to the International
Water Ski Federation (IWSF) over this past winter season, several other
AWSA Committees have recently collaborated on refining new optional
rules for Jump driving and timing.
JUMP DRIVING & TIMING OPTIONS
new optional rule will now allow the boat to continue thru the 2nd jump
timing segment, at the elevated speed with which it enters the 2nd
segment. This will be
approximately 3 mph (4.5 kph) faster than the intended nominal speed for
the Men jumping at 35 mph (57 kph), and approximately 2 mph (3 kph)
faster for all other nominal speeds.
is also an alternative option for those skiers who may prefer a less
aggressive pull. Here, the boat
speed for the remainder of the 2nd segment will be programmed to return
to the intended nominal speed, instead of continuing at the elevated
speed. If this 2nd alternative
option is chosen, or if a skier is not sufficiently aggressive to engage
the jump switch, then the "Opt(2)" slow time limit column in
the new timing table will be used instead.
is a new jump timing table (link) which is to be applied when either of
these options are chosen by the skier. This
table includes tolerances to support these options for both Record
Capability and for Class C tournaments.
Additionally, the WSTIMS computer scoring package has been
modified to incorporate these new options and is available at
and Officials should recognize that both of the AWSA - approved Speed
Control Systems currently support these two new options -- see the
manufacturer's materials for details on setup and usage.