Vessel Operation
5-15
Gathering Headway
As opposed to a boat with a single propeller, when a twin powered
vessel’s engines are put in gear together, the vessel will make headway
without the tendency to pull to the port or starboard. Of course the
throttles must be in the same rpm range as read on the tachometers.
This factor is very basic to this type of vessel having superior handling
and control in tight spaces along with being able to handle wind and
current much more adequately than single screw stern drive boats.
Turning
When maneuvering twin powered boats at slow speeds the steering
wheel is not normally used; the skipper uses the shift and throttle
handles to control the vessels actions.
A vessel’s stern may be pushed to one side or the other by moving
ahead or reversing with just one propeller. A bit of headway or sternway
does accompany the turning motion. You can gain the most turning
effect by energizing one drive in forward and the other drive in reverse.
One advantage of twin powered boats becomes evident when you can
turn the vessel in a circle just larger than the vessel itself. As an example,
to turn to starboard, the wheel can be centered, while the port engine
moves forward and the starboard engine reverses.
Begin this type of turn with the engines at idle or in gear at the same
rpm (revolutions per minute). For a starboard turn, insert the port
shifter in forward and the starboard shifter in reverse. When the vessel
starts to turn, it may begin to make headway. This relates to the boat and
propeller design. As a result, you may have to advance the port throttle
somewhat to increase the rpm of the reversing starboard propeller.
When the port engine speed is increased somewhat, the circle is bigger
and the vessel makes headway. If the port engine speed is decreased,
the circle becomes larger, but the vessel goes sternway as the reversing
starboard propeller pulls it around, stern to port.
https://www.boat-manuals.com/
Summary of Contents for 33 OBX
Page 1: ...INT INT 1 INT 1 OWNER S MANUAL 3300 33 OBX 07 02 18 https www boat manuals com ...
Page 43: ...1 17 Safety On Board NAVIGATION LIGHT RULES https www boat manuals com ...
Page 46: ...1 20 CHAPTER 1 https www boat manuals com ...
Page 68: ...CHAPTER 2 2 4 Signals https www boat manuals com ...
Page 76: ...CHAPTER 2 2 12 Notes https www boat manuals com ...
Page 91: ...Engine Controls 3 15 https www boat manuals com ...
Page 130: ...CHAPTER 4 4 18 Notes https www boat manuals com ...
Page 160: ...CHAPTER 5 5 30 Notes https www boat manuals com ...
Page 222: ...CHAPTER 6 6 62 Notes https www boat manuals com ...
Page 256: ...CHAPTER 9 9 6 Notes CHAPTER 9 https www boat manuals com ...
Page 272: ...11 8 3300 Bow Rider Dimensions 1 of 2 https www boat manuals com ...
Page 273: ...Technical Information 11 9 3300 Bow Rider Dimensions 2 of 2 https www boat manuals com ...
Page 274: ...11 10 3300 Persons Occupancy https www boat manuals com ...
Page 276: ...11 12 3300 Bow Rider Deck Hardware 2 of 5 https www boat manuals com ...
Page 277: ...Technical Information 11 13 3300 Bow Rider Deck Hardware 3 of 5 https www boat manuals com ...
Page 279: ...Technical Information 11 15 3300 Bow Rider Deck Hardware 5 of 5 https www boat manuals com ...
Page 280: ...11 16 3300 Bow Rider Hull Hardware 1 of 3 https www boat manuals com ...
Page 281: ...Technical Information 11 17 3300 Bow Rider Hull Hardware 2 of 3 https www boat manuals com ...
Page 282: ...11 18 3300 Bow Rider Hull Hardware 3 of 3 https www boat manuals com ...
Page 286: ...11 22 3300 Bow Rider Fresh Water System 2 of 2 https www boat manuals com ...
Page 288: ...11 24 3300 Bow Rider Waste Water System 2 of 2 https www boat manuals com ...
Page 289: ...Technical Information 11 25 3300 Bow Rider DC Head Panel https www boat manuals com ...
Page 290: ...11 26 3300 Bow Rider Helm Switch Panel https www boat manuals com ...
Page 291: ...Technical Information 11 27 3300 Bow Rider Helm Breaker Panel https www boat manuals com ...
Page 292: ...11 28 3300 Bow Rider Volvo IGN MERC Analog EVC https www boat manuals com ...
Page 293: ...Technical Information 11 29 3300 Bow Rider IPA Volvo MERC Analog https www boat manuals com ...
Page 294: ...11 30 3300 Bow Rider IPA Volvo MERC Analog w Garmin https www boat manuals com ...
Page 296: ...11 32 3300 Bow Rider Aft Switch Panel https www boat manuals com ...
Page 297: ...Technical Information 11 33 3300 Bow Rider Windlass Panel https www boat manuals com ...
Page 305: ...Technical Information 11 41 33 OBX Persons Occupancy https www boat manuals com ...
Page 306: ...11 42 33 OBX Deck Plan https www boat manuals com ...
Page 307: ...Technical Information 11 43 33 OBX Main Dimensions https www boat manuals com ...
Page 308: ...11 44 33 OBX Hull Hardware 1 of 3 https www boat manuals com ...
Page 309: ...Technical Information 11 45 33 OBX Hull Hardware 2 of 3 https www boat manuals com ...
Page 310: ...11 46 33 OBX Hull Hardware 3 of 3 https www boat manuals com ...
Page 311: ...Technical Information 11 47 33 OBX Strong Point Cleat Installation https www boat manuals com ...
Page 312: ...11 48 33 OBX Deck Hardware 1 of 5 https www boat manuals com ...
Page 313: ...Technical Information 11 49 33 OBX Deck Hardware 2 of 5 https www boat manuals com ...
Page 314: ...11 50 33 OBX Deck Hardware 3 of 5 https www boat manuals com ...
Page 315: ...Technical Information 11 51 33 OBX Deck Hardware 4 of 5 https www boat manuals com ...
Page 316: ...11 52 33 OBX Deck Hardware 5 of 5 https www boat manuals com ...
Page 317: ...Technical Information 11 53 33 OBX Sling Locations https www boat manuals com ...
Page 318: ...11 54 33 OBX Waste Hose Routing 1 of 2 https www boat manuals com ...
Page 319: ...Technical Information 11 55 33 OBX Waste Hose Routing 2 of 2 https www boat manuals com ...
Page 320: ...11 56 33 OBX A C Hose Routing 1 of 2 https www boat manuals com ...
Page 321: ...Technical Information 11 57 33 OBX A C Hose Routing 2 of 2 https www boat manuals com ...
Page 322: ...11 58 33 OBX Water Hose Routing https www boat manuals com ...
Page 323: ...Technical Information 11 59 33 OBX Fuel Tank Installation https www boat manuals com ...
Page 324: ...11 60 33 OBX Block Overview https www boat manuals com ...
Page 325: ...Technical Information 11 61 33 OBX Typical Switch Panel Breakout https www boat manuals com ...
Page 326: ...11 62 33 OBX Typical Dash Chartplotter Breakout https www boat manuals com ...