Anode above prop question alpha one

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Anode above prop question alpha one

Postby pyro225 » Fri Jul 27, 2018 9:20 am

So last year I had my gear cable changed, normally I do my own anodes but I got the guy to do them at the same time.

Never checked the lower ones anyway today I went for
A swim behind the boat and convinced myself the anode above the prop had fallen off. Normally I have forted a mini shark fin one here but I see nothing.

After googling I have seen you can get a flat disc kind and a
Shark fin ... does this actually look like an anode to you and not a space for one?

Cheers!
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Re: Anode above prop question alpha one

Postby SGilbert » Fri Jul 27, 2018 10:01 am

Yes, that is an anode.
Having twins, that is what I use. However, singles usually have the fin type to counteract 'prop walk' an low speed.
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Re: Anode above prop question alpha one

Postby pyro225 » Fri Jul 27, 2018 4:06 pm

Phew I will get a fin next time - might that be why I have to turn the wheel slightly one way all the time to go straight at low speed? Does it make a big difference? I will change to fin next year
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Re: Anode above prop question alpha one

Postby SGilbert » Fri Jul 27, 2018 5:12 pm

Yes, and it makes a big difference. I hope you remember about how the old fin was situated.
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Re: Anode above prop question alpha one

Postby pyro225 » Sat Jul 28, 2018 3:02 am

Oh dear no I don’t - the mechanic probably should have advised me on all this! Can’t I just point it in the middle? If I recall there is just one bolt from the top anything to stop me changing this in the water? It’s moored shallow about 2ft deep marina so I can jump on with waders on
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Re: Anode above prop question alpha one

Postby pyro225 » Sat Jul 28, 2018 3:10 am

Sorry I should have said it’s a gen 2 with power steering - does that make a difference as a little google when I was looking for one seemed to think it should be flat?
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Re: Anode above prop question alpha one

Postby SGilbert » Sat Jul 28, 2018 8:05 am

Gen2 wouldn't make a difference, nor would power steering. Single props turn the boat. Period.
I've been a twin boater for 18 years, and for the life of me, cannot remember if it's in the direction, or opposite, of the rotation.
It just hasn't been in my mental capacity for that long.

Yes, a single female headed Allen bolt. Try it one way, and you've got a 50-50 chance of being right. :)
OR---A walk down a dry stacked marina will tell you which direction and how much deflection you ought to have.
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Re: Anode above prop question alpha one

Postby gofast24 » Sat Jul 28, 2018 11:26 am

Hopefully you have counter rotating props on a twin engine outdrives units. If so, the counter rotation will take care of the steering thrust from port to starboard . If u think about a single OD when turning the steering wheel CW (to turn right) the OD actually swings right as well (if looking from the top of the OD the back of the OD lower unit it swings to the starboard side) . If you cant remember where the two combo trim tabs/anodes were located before removing just set them both to in line with the vessel keel (straight ahead) and see how the vessel reacts when running straight head. .
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Re: Anode above prop question alpha one

Postby SGilbert » Sat Jul 28, 2018 12:49 pm

The OP has a single.
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Re: Anode above prop question alpha one

Postby gofast24 » Sun Jul 29, 2018 11:11 am

SGilbert wrote:The OP has a single.

Sorry, didnt pick up on that, getting old :)
Yes, on a single OD the trim tab will make a big difference! My second to last vessel was a 24' Python, single 502 Bravo 1 V8, the prop torque gets pretty wild if trimming the lower unit out at 70+ MPH.
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