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steering geometries between engine and rudders...

A forum for discussing boat or trailer repairs or modifications that you have made or are considering.
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restless
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Sailboat: MacGregor 26X
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Re: steering geometries between engine and rudders...

Post by restless »

You cant bring the rudders and prop into contact

if I run aground that can happen already anyway
you dont limit the engine movement by wires instead of stops
That is all a bit messy for sure, but nonetheless the engine should go from its own stop to stop. Is it only Ray and I that think this way? :P
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Catigale
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Re: steering geometries between engine and rudders...

Post by Catigale »

but nonetheless the engine should go from its own stop to stop
The engine is not designed solely for the Mac, so there is no reason the stop is the 'natural limit' for the motor on any install...
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kelseydo
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Re: steering geometries between engine and rudders...

Post by kelseydo »

Restless,
I’ve had the same concern. As I investigated further I discovered that I had more rudder travel in one direction than another. The PO had advised me the steering had been upgraded, and I’m guessing the mechanic did not pay too much attention to the details. This pic shows the use of a shroud adjuster as a steering adjustment device to get equal travel in both directions, plus a fulcrum and longer connecting rod I added to get more engine travel. Also in the pic a ball to store the engine at center. I never did get the three to run parallel and still be able raise the engine and keep full rudder travel, but it is much better. The engine is an old Nissan 50 with what I assume is the stock Mac ball on the front.
I leave both rudders down and the keel at least 50% down docking and loading on the trailer; jerking the keel up at the last minute as I slide on the trailer. I had very stiff cross winds today docking and loading, no fun, glad for the mods, wish I had a bow thruster or a crew.
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Highlander
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Re: steering geometries between engine and rudders...

Post by Highlander »

OK
On my Mac19 after I installed the Jackplate I got this used Merc. steering link & bent it until I was able to get the steering to equalize on both sides really was quite easy except that steering bar was a Hull of a pita to bend
http://i78.photobucket.com/albums/j95/m ... 010003.jpg

http://i78.photobucket.com/albums/j95/m ... 010005.jpg

Notice that I had to install the steeering cable directly onto the motor rather than onto the mac brkt that the X & M has also remember that on this mod I done that I am using a twin rack & pinion set up one for the rudders & one for the motor it was also a no feed back system so I could set the steering & it would never alter course

J
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restless
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Re: steering geometries between engine and rudders...

Post by restless »

Kelseydo... you've smacked the nail right on the head. I hadn't even mentioned the fact that I need to pack out my outer tube by an inch or so.. as you've already done. Your radius extension is a great idea, I may well go that way as the other options are all awkward (ie reduce link point on engine) The only thing I don't like about this set up is that I'll lose the very quick and easy dissassembley set up as it is now. Do I need this feature? I like things that come apart easily. Probly because I've had so many failures in this area already. Crucial systems should be simple, easily worked on and straight forward jury rigging well planned in advance. I never unhook the engine when sailing.. it has never been an issue to date. One less thing to suprise me when coming in to dock and need to relink in a hurry coz I forgot!

H'lder.. as ever, serious hardware and the sort of over-engineering I paricularly appreciate. I dunno about double cable systems, but then I don't know the 19 and their issues at all. My helm unit is hydraulic with nr valves in so it is similar to yours in that it locks in place at the cost of 'weather helm..' I'm happy with this. It also features a ss short cable tail, so the slave is inside nice n dry! Makes fitting very straightforward. This set up was designed for commerial fishing boats.

All mod photos can be seen here... the site has little rhyme nor reason at the mo.. just go through the pages and the pics will tell their story
http://www.ironengineer.com/mac/

Just spent a couple of hours cleaning it all up a bit...
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