Propulsion

Discuss marine engines, drives, and propulsion systems.

Props

Propeller selection, performance comparison, prediction, experience, and modification.
Threads
545
Messages
6,499
Threads
545
Messages
6,499
C
Prop Selection for Production Boat

Surface Drives

Surface Drives. Arneson, BPM, Seafury, PSI, Levi, Etc.
Threads
187
Messages
2,880
Threads
187
Messages
2,880
G
Levi Surface Drive Sea Rider Customization
  • Gio

Jet Drives

Jet Drives (pumps, impellers, etc.)
Threads
464
Messages
4,478
Threads
464
Messages
4,478
L
help castoldi 238

Outboards

2-stroke and 4-stroke outboard motors.
Threads
1,054
Messages
10,278
Threads
1,054
Messages
10,278
HelmutSheina
Mysterious shifting problem with Suzuki DF 20

Sterndrives

Stern drive lower and upper units, transom and gimbal assemblies, steering, and trim pumps. Mercruiser (Alpha One, Alpha One Generation II, Alpha SS, Bravo One, Bravo Two, Bravo Three, Bravo XR Sportmaster, TRS, Speed Master), IMCO, ILMOR, Konrad, OMC, Volvo Penta
Threads
552
Messages
3,882
Sub-forums:
  1. Gas Engines (link)
  2. Diesel Engines (link)
Threads
552
Messages
3,882
gonzo
Mercruiser Alpha 1 gen 2

Pod Drives

Volvo IPS, ZF, CMD Zeus, and other pod-drive systems
Threads
29
Messages
302
Sub-forums:
  1. Gas Engines (link)
  2. Diesel Engines (link)
Threads
29
Messages
302
brian eiland
hydraulic pod drive 30' displacement hull

Inboards

Inboard and Vee-drive hardware: struts, stuffing boxes, transmissions, coolers
Threads
541
Messages
5,052
Sub-forums:
  1. Gas Engines (link)
  2. Diesel Engines (link)
Threads
541
Messages
5,052
R
Simple thrust bearing systems still available?

Diesel Engines

Diesel Engines
Threads
696
Messages
8,741
Threads
696
Messages
8,741
M
Diesel outboards

Gas Engines

Gasoline Engines
Threads
424
Messages
4,656
Threads
424
Messages
4,656
gonzo
How to Measure the Timing Chain-VOLVO engine 5.7GXI

Electric Propulsion

Electric propulsion systems
Threads
117
Messages
2,247
Threads
117
Messages
2,247
G
coupler from VP 120S sail drive to 10 KW Golden Motor

Hybrid

Hybrid propulsion such as diesel electric, hydraulic.
Threads
212
Messages
5,294
Threads
212
Messages
5,294
fallguy
Real Hybrid

DIY Marinizing

A forum to discuss "do it yourself" marinizing of engines / conversion of automotive engines to marine use.
Threads
276
Messages
5,578
Threads
276
Messages
5,578
R
VW/AUDI 3.0TDI marinising
V
Mercruiser coupling tolerance
2
Replies
15
Views
1,816
HelmutSheina
HelmutSheina
E
"Powerfin" perpendicular(?) rowing method/system
Replies
2
Views
1,370
Eurosnob
E
DogCavalry
The Vinegar Cure
Replies
5
Views
1,846
Dave G 9N
D
yabert
Thrust bearing for propeller shaft
2 3 4
Replies
48
Views
10,348
Laurence Bellamy
L
brian eiland
Exciting New EPS Thruster (& Propulsion)
4 5 6
Replies
88
Views
115,220
brian eiland
brian eiland
A
BRP Jet Ski TPS Reset
Replies
2
Views
969
AprilSky
A
Goranskoog
Hybrid Wave-and-Current Through-Channel Propulsion Concept – Engineering Feedback Requested
Replies
6
Views
1,106
Goranskoog
Goranskoog
Capt. Flint
Keel Cooling Yanmar
2
Replies
18
Views
2,378
DogCavalry
DogCavalry
B
propeller between catamaran
2
Replies
15
Views
3,675
baeckmo
B
K
Engine-Propeller Matching for an Ambulance Boat
Replies
4
Views
1,443
gonzo
gonzo
P
Additional electric motor while leaving original in place and using original ax
2
Replies
20
Views
4,672
philSweet
philSweet
S
Sodium Borohydride as a Source of Maritime Fuel
Replies
4
Views
1,850
philSweet
philSweet
E
How can I setup my fuel system for my Single outboard Catamaran with dual tanks?
Replies
6
Views
2,667
fallguy
fallguy
S
Hydraulic start
Replies
4
Views
2,380
gonzo
gonzo
W
Kick-up propeller shaft for shallow draft
2
Replies
18
Views
4,070
gonzo
gonzo
J
Unequal size exhaust hose and thru hull connection
Replies
6
Views
2,095
seasquirt
seasquirt
D
Aquadrive CV Joint Spraying Grease
Replies
9
Views
2,888
DogCavalry
DogCavalry
M
Deciding on the best axle for my sailingboat
Replies
1
Views
1,760
gonzo
gonzo
S
Can you run the main engine submerged while still on the dry dock?
Replies
3
Views
3,376
fallguy
fallguy
C
Propulsion for a 36ft aluminum boat
Replies
11
Views
3,488
BlueBell
BlueBell
David Swingler
Outdrive to Inboard conversion
Replies
9
Views
3,958
fallguy
fallguy
DCockey
Yamaha acquires Torqeedo
Replies
5
Views
3,767
Paul Scott
Paul Scott
P
Gear ratio for houseboat
Replies
13
Views
4,769
gonzo
gonzo
P
Re-powering a houseboat - Stay with Stern drive?
2
Replies
17
Views
5,356
paticus
P
Guillermo
New propulsion sytems for ships
37 38 39
Replies
579
Views
210,191
fredrosse
fredrosse
MarkOHara
Versilcraft / C.L.M. Studio Tecnico Navale, where are they now?
Replies
5
Views
3,022
Rumars
R
naserrishehri
Power efficiency
2
Replies
16
Views
6,380
TANSL
T
valter.f
Twin stern tube propeller with only one engine
2
Replies
15
Views
6,024
valter.f
valter.f
F
Large hp outboard on a tri
Replies
2
Views
2,910
Paul Scott
Paul Scott
F
Outboard sail drive
Replies
8
Views
2,692
Forecaddie
F
B
Sternwheeler Power Requirements
2
Replies
22
Views
10,160
Spokart
S
R
Air boat for flood emergency
Replies
3
Views
2,765
portacruise
P
T
15 foot Aluminum Boat with Z482 Kubota
2
Replies
28
Views
9,594
TheyCallMeTrinity
T
A
RPM to Speed
Replies
9
Views
4,225
Andy58
A
T
Evinrude E-tec 300hp v6 what/how to check?
2
Replies
17
Views
6,479
telak
T
M
  • Poll Poll
Favorite Type of Power for a Powerboat
2 3
Replies
38
Views
14,634
BlueBell
BlueBell
E
Dual - Fuel marine engines
Replies
6
Views
3,257
baeckmo
B
DogCavalry
Power to Weight Ratio
Replies
9
Views
3,731
jehardiman
jehardiman
R
Propeller Puller
Replies
10
Views
3,676
Ruffner Sedurifa
R
Kirk
How to make a pedal powered prop.
2
Replies
15
Views
17,797
Kirk
Kirk
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