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New at this guys, sorry for the lack of onfo. Can't afford DP so I'm turning the old SP LH that I have right now. Just want to know if there will be any differance getting on plane or slow maneuvering with changing from LH to RH rotation?
bfalzara wrote:
New at this guys, sorry for the lack of onfo. Can't afford DP so I'm turning the old SP LH that I have right now. Just want to know if there will be any differance getting on plane or slow maneuvering with changing from LH to RH rotation?
The prop is 16x15.
Whichever direction your propeller turns right now is the one to stick with, unless you want to spend a lot of money changing parts or running in reverse to go FWD.
Pat says: DO-IT-RIGHT THE FIRST TIME!
Bayliner 3870 "ALASKA33)
Twin 350 GM power
Located in Seward, AK
Retired marine surveyor
The transmission main drive gear turns two "driven" gears.
Either driven gear can be FWD or REV.
The s/p lower unit hypoid gears are designed to deliver power during either rotation... although from a highly technical view point, the gear cut would appear to be best for a LH prop.
This is how Volvo does the Stbd RH rotation on twin engines boats.
Port drive transmission linkage rotates the eccentric piston CW (lower "driven" gear) for FWD gear engagement (as seen in this image).
Stbd drive transmission linkage rotates the eccentric piston CCW (upper "driven" gear) for FWD gear engagement.
The engine and the s/p lower unit don't know the difference.
Here's a 290 set up to use the lower driven gear for FWD.
If single prop, this one would be using a LH propeller.
If Duo Prop, there is no choice.... the lower "driven" gear must be used.
NOTE:
the vertical linkage piece is always pulling down for FWD gear.... regardless of which hand prop is being used.
the shift cable always "extends" at the drive for FWD gear.... again, regardless of which hand prop.
Shown here is a FWD engagement.
Shift cable is extended...... bell crank is swung towards AFT... linkage has been pulled down.... eccentric piston has been rotated CW.
Merc BI and BII drives, I believe, are LH RH capable also.
.
Rick E. Gresham, Oregon
2850 Bounty Sedan Flybridge model
Twin 280 HP 5.7's w/ Closed Cooling
Volvo Penta DuoProp Drives
Kohler 4 CZ Gen Set
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