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Navman Diesel Fuel Flow Sensors Manual

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Diesel fuel flow sensor kit Installation and Operation Manual
NAVMAN
Understanding your slip factor
Now, some slip is always to be expected. This
slip factor varies with different types of hull, and
typical slip factors are -
A propeller encased in an aperture behind
a keel, as in a yacht: 40%.
A hard chine planing hull with a full keel,
or deadwood: 30% to 35%.
·
A hard chine planing hull with little or no
keel: 25% to 30%.
Twin engined planing hulls: 18% to 25%.
If your calculations show you have a slip factor
that is much more than the figure above, then
further investigation is warranted. The propeller
may be the wrong size for the present engine,
or it might have got damaged, or there may be
a fitting on the hull that is disturbing the flow
ahead of the propeller. Propellers like to bite into
undisturbed water, and will not work efficiently
if water is aerated or churned up.
If the propeller is undersize, then it drills a hole
in the water, and the engine’s excess power just
makes frothy water.
If the propeller is oversize for the engine, the
engine will not be able to reach its maximum
operating RPM. The engines speed governor
will still try to achieve that RPM, and will open
up the throttle and pour as much fuel into the
engine as it can. If the engine can’t generate
any more power at that RPM, all that extra fuel
just ends up as heat, and that’s when things get
really expensive if the situation persists for any
length of time. Be warned - over propping an
engine will drastically shorten its life.
An excellent book with lots more information and
analysis of propellers is “Propeller Handbook”
by Dave Gerr (ISBN 0 7136 5751 0).
… 16 …


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Others manual(s) of Navman Diesel Fuel Flow Sensors

Navman Diesel Fuel Flow Sensors User Manual - German - 34 pages

Navman Diesel Fuel Flow Sensors User Manual - Dutch - 32 pages


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