Rigging twin outboards

G

gands111

New member
Ok brats I've got a question, when rigging twin outboards do you want the outboards perfectly aligned or is toe in our out preferred.

Comments please.

Dan
 
I have no idea, so I will be checking back on this one. I have twin 40 Yami's and I know they have a little fin on the bottom of the anticavitation plat that is moveable to help align the steering but to be truthful, mine is either set up right already or I can't tell. :roll:

I'll be back here for the rest of the story.

Harvey
SleepyC :moon
 
Interesting. I have never heard of/experienced twins rigged unless they were perfectly straight. If they were not straight you would be loosing thrust.

Though I'm sure others will chime in.
 
I asked this same question of Les at EQ when I noticed that my twin Honda 40s' were slightly toed in (just a couple of degrees). Les and Karl, his engine guy said they needed to be slightly toed in. Sorry I can't recall the exact reason but I was convinced and left mine the way they were.
 
At least for the range of sizes most of us have on our boats here, I believe slight toe-in is the standard set-up. I suppose with higher horse-power, wider spacing or counter-rotating props, things could change. I'm sure others on the site know more about this stuff, and can explain the reasoning.
 
I know I've read the explanation before, but memory is a fleeting phenomenon as my years add up. But hopefully I'm wiser with time, and not just a wise -a...!

Here's a thought-out guess:

If the motors are toed out, they'll fight each other when going straight and have different turning radiuses in different directions. Both bad characteristics.

If they're lined up parallel, they have the same turning radius, but the one on the outside has to go further to make the turn and the inner one will want to make the boat go straight as it is on the inside of the curve pushing just as hard as the one on the outside. Thus it's hard to turn.

If they're toed in, the slight toe in neutralizes itself in straight travel, and the outside one on a turn has angular leverage over the inside one to force the boat to turn and track in the desired direction.

The explanation may also lie in whether the motors are counter-rotating and which way they're set up: (Function of prop-walk)

C-W on Port, CC-W on Starboard, (more common)
or
CC-W on Port, C-W- on Starboard (less common, higher stern lift)

Dr. Bob or someone has answered the question before. Maybe their explanation will be easier to follow!

This is a bigger issue on catamarans with their greater lateral separation of motors.

Joe. :teeth :thup
 
You guys are great however it sounds like you may need some more facts.

I'm specifically talking about twin honda 150's and one is counter rotating if that makes a difference. These motors are currently towed in about a 1/2" and I'm trying to determine if that's correct.

Please keep the comments coming.

Thanks

Dan
 
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