Hooyer Flashcards
The position of the __________ plays a crucial role in explaining ship behavior.
Pivot point
True / False
We can not move a ship sideways without rotational motion.
True
pg 8
The moment of a force about a point is the product of that force and ____________________.
The perpendicular on its line of action.
Momentum is the quantity of motion measured by the product of mass and __________.
Velocity
Pg 8
True / False
Frictional drag has relatively less retarding effect on bigger ships.
True
Big ships sustain speed because of the relatively small wetted area and lower frictional drag.
Pg 9
When ship’s momentum acts as a force the ___________ is the pt of impact of that force.
Center of gravity
The magnitude of longitudinal and lateral resistance depends on what?
(Two things)
Ships speed and shape
Pg. 11
They are directly proportionate to ship’s prop force at a constant speed.
Force exerted a ship will result in motion only after _______ has been overcome.
Inertia
Pg 11
True / False
A beam wind meets lateral resistance where a beam current does not.
True
Pg. 11
When birthing big tankers the sim is to obtain a singular ___________ motion and prevent __________ motion the moment of making contact on the dock.
Lateral motion
Rotational motion
Pg. 12
Easier to check lateral motion.
Rudder and propeller produces a combination of ______ motions. A. 1 B.2
C.3 D. 4
C. 3
Pg.12
What are the three motions a propeller and rudder produce?
Lateral, longitudinal and rotational
Pg. 12
The direction of ________ motion of the ship determines to a very large extent the position of the pivot pt.
Longitudinal
Pg. 13
1 ton of bollard pull = ________ HP
100 HP
Longitudinal resistance = _____ % of propulsion force under constant speed.
25 %
Transverse force of propeller working astern = _____ % of applied stern power.
5 - 10 % applied stern power.
Rotational motion is about a ____________ axis and is influenced by ship’s shape, motion, magnitude and point of impact of various forces.
Vertical the top of the vertical axis can be considered the pivot pt spot.
True / False
Frictional drag has no effect on the position of the pivot point.
True
Pg. 17