MAIN The lightweight F115 is a good match for alloy hulls up
to around 1500kg.
TOP The colour of reliability and efficiencyO
n the power and
performance
side, the
latest Yamaha
F115XB is the
maximum horsepower
rating for the 575 and it’s the
ideal marriage of power to
weight and hull design. Four
cylinders of 1.8L fuel injected
four stroke grunt is what you
get out of this motor.
The Yamaha 115 was fitted
with a standard 13 ¼ x 17”
Yamaha ally prop and being
a relatively lightweight hull
at approximately 1500kg,
the combination produces a
nippy hole-shot, comfortable
midrange speed of 20 knots
at 4000rpm, and decent top
end of around 35 knots at
6000rpm.
One aspect of this motor
and hull combination that’sreally impressive is the
economy throughout the rev
ranges. At low troll speeds
around 5 knots the 115 sits
at 1500rpm and sips away
at 3.5LPH–and that’s many
hours of trolling off the 100L
fuel tank.
In the mid-range the
optimum and comfortable
cruise speed is around the
20-knot mark, with revs
sitting at 4000rpm and again
a very impressive fuel burn
of 15.3LPH.
Knock the hammer
down to WOT the fuel burn
then jumps to 40.7LPH at
6000rpm. Considering the
speed, it’s actually a decent
economy considering
the hull size. Let’s face it,
wringing a motors neck at
max revs is not ideal on any
motor, and who really travelstradeboats.com.au 67