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Old 07 July 2014, 00:34   #41
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I have a Zodiac WB465, which is similar to an FC 470 but without speed tubes. My transom measured 19 inches, and my Evindrude ETEC was a long shaft that measured 22 inches to the AV plate. Accordingly, my AV plate was 3 inches below the bottom of the transom.

I had horrible performance issues that are perfectly explained by a hook in the hull. Unfortunately, my dealer incorrectly assembled the floorboards, which would have hooked the hull, and this went unnoticed. The boat was correctly assembled at the same time that the transom was plated to raise the motor so that the AV plate now sits 1/2-3/4 inch below transom bottom. The bow steering is much, much better, but now, I get plenty of prop ventilation - as if the motor is too high. I now wish that I could easily try to lower the motor, but to do so now is a big job because the transom was plated to this height.

Based on my experience, I would not raise your motor so much (4 inches!). I'd consider raising it 3 (or less), and leave the possibility to raise it another inch by placing a 1 inch block of wood above whatever you build to raise it. It's easier to do that than to have to reposition the device you will use to raise the transom, no?

Part of me thinks that Zodiac makes these transoms < 20 inches for a reason. Ie. They are supposed to run with the AV plate a little lower than on conventional hulls. Maybe that's wishful thinking.

SIBRider has done what you are doing. You should see his pics.

I'm very keen to hear how this turns out for you.
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Old 07 July 2014, 16:29   #42
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Thanks for the input. My AV plate is currently 4.75" below the hull. If I raise the motor per drawings (4.375") it will be 0.4" below the hull. I suppose I could have it slightly lower (0.75" below) and an extra set of holes wouldn't hurt so I can drop it another 1/2" if need be.
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Old 08 July 2014, 22:31   #43
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Determining Shaft length on a Zodiac FC470

I'm considering making it adjustable with 3 half inch steps. What height do you think should be the neutral position? Should the neutral position be flush AV plate/hull or 1" below? I know on a normal boat without speed tubes it is supposed to be flush but am I correct to assume that the FC470 can ride a little lower as default position due to the speed tubes? Clearly from my own experience 4.75" below is way off but how would 1-2" work? What height are yours currently at?

I'm considering these adjustability options.

Option a) 0", 0.5" and 1" below hull
Option b) 0.5", 1" and 1.5" below hull
Option c) 1", 1.5" and 2" below hull

Please vote
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Old 08 July 2014, 22:33   #44
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Or option d) 0", 1" and 2".
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Old 08 July 2014, 23:58   #45
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Here's a screenshot of the adjustable transom riser. Shown here with a 0", 1" and 2" drop of AV plate below hull.
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Old 09 July 2014, 00:03   #46
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Why not have the middle or highest position where SIBRider has his? He also has an FC470 ...

If I had to pick, I'd go with B.
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Old 09 July 2014, 00:09   #47
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I don't know what he has other than judging from the picture it looks like about 0.5" below the hull.
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Old 09 July 2014, 02:41   #48
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What size bolt do you plan to use? Step must be larger than diameter of bolt hole otherwise holes will touch making a slot. So for 0.5" bolt you would need at least 0.75" step. IMHO there is no point going much more than 1" below. I'd go with +0.25 -0.5 -1.25. Make sure you set it up at 90 degree motor to water surface trim position, approximately 15 degrees angle between motor and transom.

Mine is 0.5" below or so.
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Old 09 July 2014, 12:23   #49
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Thanks! I like the idea of 0.75" increments. 0.5" seems small. You mentioned +0.25". Would you really want the AV to be slightly above the the hull on a Zodiac?
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Old 09 July 2014, 12:26   #50
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The ones in the CAD model are 5/16". Too small? I use larger ones for the ones that don't hold the motor down as I am limited by what can pass through the motor mount holes.
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