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Old 11 July 2014, 13:12   #61
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Whatever you guys come up with, patent it! I'm sure many inflatable owners would find it useful.
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Old 11 July 2014, 13:51   #62
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there are quite a few manual and not jack plates available already.
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Old 12 July 2014, 21:27   #63
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I have quite a few patents. Its been a fun exercise but I don't think this one is worth the investment in terms of patent. There are a lot of solutions out there but none are specific to FC-470's so the best reason to make one as far as I can tell is to make it fit specifically to the particular transom thickness and shaft length requirements of a FC-470. The nicest one I found was made by a guy named Tom C a few years ago called TSG Jack plates but he no longer makes them. Here's a link. His design is much better than mine because it provides a much higher range of adjustment. My design as is, if I choose to have the motor bolted through the transom will only provide 0.91" range of adjustment so at that point you can ask yourself if it's worth the effort to make it adjustable to begin with.
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Old 17 July 2014, 22:54   #64
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I'm running out of time so I have decided to buy a jack plate instead. I'm looking at the Detwiler D1000 (JP1040) which has a setback of 4" but I cannot find the maximum vertical adjustment anywhere and I haven't heard back from the company. Any guess as to what the vertical adjustment might be on this model? Does perhaps even someone on here own it?
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Old 18 July 2014, 11:29   #65
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It's not going to work as it is. Those kind of plates are much larger then it seems from pictures. It interferes with deck drains as is. Has to be modified a bit to fit nothing too major. I have brand new very similar design (no black anodizing) 3" setback 4" height adjustment. Got it to research that hot topic of "AV/DP water flows". Unfortunately free time is not on my side. Don't know if I get to it this summer. Way too busy. If you want to tinker with it or check it out let me know today. Heading south tonight to climb Shasta then gone all next week.
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Old 18 July 2014, 11:57   #66
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You're right. I just heard back from them. Back to the drawing board. I would live to see what are willing to share but I am booked today. I will send you a PM with email address, if you have time to send a few pictures that would be very helpful. Have fun at Shasta!
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Old 18 July 2014, 14:21   #67
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Old 18 July 2014, 20:31   #68
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Other thing to watch if you're setting the motor back is interference from the transom when you tilt the motor.

jky
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Old 28 August 2014, 18:37   #69
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I'm running into this problem on my current rig which is the 1999-up "long shaft" transom design like yours. Previously I have run AML35 short shaft motor on the older notched transom "short shaft" F470s as well as various long-shaft outboards on the same "short shaft" F470s in combination with the CMK Transom Cap which essentially turns the "short shaft" transom to a "long shaft" one and never had these problems. However with my current setup I am experiencing water flowing over transom into boat at cruise unless trimmed excessively out and lower top speed than I should be getting with this big a motor on a 300# rubber boat. I am currently running a 20" shaft motor raised one bolt hole position above "flat to the transom" level which appeared to put my cav plate at the same level as the transom bottom/keel but it isn't enough. I was planning on raising it another bolt hole position this weekend and testing the result. This whole rig was an experiment anyway to see how far I can take the platform (build thread coming soon) and surprisingly this is the only issue I've run into...it's also the only issue I didn't anticipate :-/

I have been around boats all my life but never encountered this before so I too am learning as I go on this. Its just really hard to see what it going on back there while underway. My concern is if it gets too high you can get an air pocket around the water pump inlet, reducing cooling flow and possibly overheating the motor. An adjustable jack plate would be the answer but seems overkill, however it is a PITA to do this "trial and error" style.

If you do make an "extension" plate I would suggest making it wider to spread the fore/aft twisting force along as much of the transom as possible and not concentrating it all in the middle. I have seen plenty of broken/cracked transoms on F470s, although I'd guess a lot of those were from airdrops gone bad I still wouldn't temp fate.
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Old 28 August 2014, 18:49   #70
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Yamaha 90 is one big motor for F470.
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