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Old 02 December 2017, 20:34   #1
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Zodiac 470 first run problems

Ran my f470 today for the first time and had a couple issues with the bow wanting to dive. A little background about it is that the speed tubes have been removed because the previous owner filled them with foam for some reason. And I do not have an inflatable keel yet. The bow kept wanting to stay down when I applied power it is a 15 johnson 2 stroke. I had it inflated to about 2.5psi would that be the issue or is it more so the lack of keel?
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Old 02 December 2017, 22:12   #2
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Also tried the engine at a couple different trim angles and it didnít seem to help
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Old 03 December 2017, 03:47   #3
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The keel does two important jobs: it helps with rigidity, and it creates the correct underwater profile. Without a keel, the boat will be less rigid and the wrong shape. The chance of getting it to plane is slim, and will rely on brute force and careful weight distribution if it is to work at all. Then it may not be safe.

On my first ever SIB, I lost the inflatable keel when packing away on the beach after a long day. Next time I used the boat, I put extra air in the tubes for rigidity. I managed to get it more or less on the plane but then, with no keel to keep everything in place, the front two floorboards came out of position and slid under the 3rd board.

You either need to find a new keel or find some way of improvising with something light and about the same shape. Good luck.
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Old 03 December 2017, 06:50   #4
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Should be easy enough to retrofit an inflatable keel. The part simply can be glued to inside of the keel at two locations at the transom and where the valve is near the bow. Don't glue the entire length. What's the floor made of, aluminium floorboards or marine ply? With the tubes and keel tube inflated to correct PSI, then the stringers that hold the floor in place lock into position to give the boat rigidity.

Useful link: Zodiac 470. Defender keel?

Defender keels here: https://www.defender.com/category.js...895&id=2345896
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Old 03 December 2017, 08:49   #5
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When you find a keel it can be fitted with 3 large pads of Mil spec Velcro at bow, center and stern. This way sand and debris can be cleaned out as needed.

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Old 03 December 2017, 10:32   #6
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F 470

Need to run at a higher pressure should be around 3.2 psi. Do you still have the speed tube sheathes on the boat or are those removed to? Those full of water would certainly hurt performance as well.
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Old 03 December 2017, 16:26   #7
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Zodiac 470 first run problems

Ok thanks for confirming my suspicions I will give it a shot at 3.2 psi and order the keel I assume the 345 cm on defender will work? Doesnít matter where the fill port is I will drill a hole to match. I completely removed the speed tubes
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Old 03 December 2017, 17:45   #8
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You should very location of the keel valve and other dims. Diameter will make a difference too

I may have a used keel for a 470.
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Old 03 December 2017, 22:44   #9
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Quote:
Originally Posted by cgoing View Post
You should very location of the keel valve and other dims. Diameter will make a difference too

I may have a used keel for a 470.


Let me know what you want for it
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Old 17 March 2018, 13:23   #10
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Ok so yesterday it was a beautiful day and was able to run the boat with the keel and tubes aired up to 3.4 psi and what a difference it makes! with me (230lbs) safety gear and 2 gallons of gas i was able to hold a constant 20mph with the 2 stroke 15hp johnson and a 9.25x10 3 blade. I was still only able to run with the engine tucked all the way in if I changed the trim pin to lift the bow by one pin hole it starts to plane then the prop blows out. Thinking about changing it to a 9.25x10 4 blade the engine has plenty of top end rpm left it sounds like so if it drops 500 rpm it wont be an issue. Or i could go with a 9.25x11 3 blade any ideas? The 4 blade will definately help with the prop blowing out as well as hole shot with a heavier hunting load.
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