- Feb 4, 2007
- 7,251
- Boat Info
- 1996 450DA, TNT, Caribe dink w/15hp OB.
- Engines
- 3126 427HP TD transmissions
Is that why, on my drives, they exhaust out the prop? It's more efficient to push into the air from the exhaust than pushing into pure water?
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Is that why, on my drives, they exhaust out the prop? It's more efficient to push into the air from the exhaust than pushing into pure water?
Is that why, on my drives, they exhaust out the prop? It's more efficient to push into the air from the exhaust than pushing into pure water?
The cleaver propellers are a more effient way to move water, but they must be operated with a certain amt of air ventalation. So you move them up on the X dimension. That allows the blades to spin faster with less resistance, not boil the H20, and push more water out the bottom of the prop....where most of the thrust is created. Its the reason you see vent tubes on nearly all #6 drives and most arnesons like on the fountain 48 EC to help them get on plane. Running a proper surface application on your boat usually yields a few extra MPH with no change in power. You probably do get a benefit of more thrust in the form of a rooster tail, but there isnt any water behind the top of the prop, when running fast, so its not helping pull you fwd.