| ||||
|
#1
| |||
| |||
| small outboard prop question On a small outboard motor, say 5-6 hp two stroke, whats the prop speed vs/engine speed? Are they geared down? Are 4 strokes geared different, I'm thinking that four strokes do not rev as high as a two stroke would at max speed. What does a small outboard like that turn for rpm?? Thanks! |
|
#2
| |||
| |||
| I believe Max Motor speed for both the 2 stroke and 4 stroke is 4500 - 5500 rpm with 2:1 Gearing. i.e. Prop running half speed |
|
#3
| |||
| |||
| 2:1 won't be far out, for example a Yamaha 30 is 1.84:1, the deciding factor is the crownwheel and pinion size in a slim gearbox. |
|
#4
| |||
| |||
| Some of the 4 strokes I've seen rev a little higher than the equivalent two stroke. |
![]() |
| Thread Tools | Search this Thread |
| Display Modes | |
| |
Similar Threads | ||||
| Thread | Thread Starter | Forum | Replies | Last Post |
| prop size for sailboat outboard | liz | Outboards | 9 | 07-29-2007 11:34 AM |
| outboard with prop ,switch to jet | dooley | Outboards | 3 | 06-10-2007 01:23 AM |
| outboard prop | justryd | Sailboats | 3 | 06-13-2005 01:55 PM |
| measuring outboard prop hp? | kenfyoozed | Boat Design | 4 | 03-18-2005 05:00 PM |
| Prop vs. Jet on Outboard Lower Unit | Mynx | Propulsion | 1 | 07-20-2004 07:40 PM |