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8.Technical
Specifications
IMPELLERTRANSMISSION
The impellers, mounted on synthetic sapphire
bearings, are equipped with powerful magnets that
generate magnetic impulses. These impulses are
collected by coils (also called "Sensor") and treated
electronically to be displayed speeds on a LCD, as
speeds. The magnetic impulses can go through any
materials:fiberglass,carbonfiber,aramidfiber,wood,
plastic, aluminium, stainless steel, etc... This is why
youdonotneedtopierceyourhull.Thisverysensitive
system may display a value near an electric engine, a
computer or an electric light, even if the impeller is
not turning. This is normal and does not affect the
readings when the impeller is turning. This original
and patented transmission process is the property of
JDCELECTRONICS.A.
TRANSMITTERRANGE
The SPEEDWATCH transmitter operates on a low
frequency(8Khz)wireless transmissiontothedisplay.
Multipledisplaysmaybeusedononetransmitter.The
range is tuned to provide maximum distance in a
watercraft, yet not cause any interference with other
nearbysystems.
ACCURACY
TestsweremadeattheBremenUniversity(Germany)
in hydraulic canals. Results clearly showed that the
SPEEDWATCH is in the L.D.A. (Laser Doppler
Anemometry)accuracyrangeof3%.
SPINOUT
All water tests were made in real situation with high
speed windsurfs (more than 30 knots) showed that
therewasnoturbulenceduetotheTattachmentthat
would take down the fin. Information transmitted by
majorEuropeanwindsurfmanufacturers
TRAIL
The impeller trail is 40 grams at 10 knots.
Measurements were made in hydraulic canals under
the care of the Bremen University in Germany.
15


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