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Old 09 August 2015, 15:57   #81
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Ahh OK... time to find a bit of ply and give it a go. Hopefully out this Fri.
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Old 11 August 2015, 05:36   #82
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Here's a plan pic of the plate (click to get full size and then click on + symbol) - to get the exact template size you will need to print on paper/card and test fit first but approximately 205mm at the widest point of the outer perimeter:

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Old 11 August 2015, 06:29   #83
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Thanks Max. I'll make a card template from the image and refine that to be as as tight as possible to the leg before I cut the ply.... mind you I think our outboards will be identical.
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Old 19 September 2015, 19:09   #84
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Did you make one? I lost mine today somewhere past Beachy Head. WOT run for ages in the waves then noticed I had very wet feet and the anti splash plate had gone west!
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Old 19 September 2015, 19:26   #85
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No Max it's on the to do list!

It's been a bit frantic since that holiday period of ours some two months ago when there was much discussion on here about the splashing... but now we are down to one outfit I can concentrate a bit.

Perhaps a combined transom mounted anti-splash plate and sonar transducer mount!
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Old 20 September 2015, 11:42   #86
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I racked my brains about mounting one on the transom but despite looking at it from every angle could not find a way to do it without drilling the transom (even more than it has by previous owners for rod holders etc) which I really did not want to do.

Judging from the ridiculous amounts of water being thrown up once we lost the plate it certainly did a reasonably good job but far from perfect and it did just deflect most of the splashing backwards.

Made no difference to speed but as mentioned before I've been a bit disappointed with our top speed in the 380/Merc 15 - really about 16.5 to 17 at WOT when I would have hoped for more. We're not heavily loaded, maybe 160 kg (350 lbs?)
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Old 20 September 2015, 11:50   #87
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Quote:
Originally Posted by Max... View Post
I racked my brains about mounting one on the transom but despite looking at it from every angle could not find a way to do it without drilling the transom (even more than it has by previous owners for rod holders etc) which I really did not want to do.

Judging from the ridiculous amounts of water being thrown up once we lost the plate it certainly did a reasonably good job but far from perfect and it did just deflect most of the splashing backwards.

Made no difference to speed but as mentioned before I've been a bit disappointed with our top speed in the 380/Merc 15 - really about 16.5 to 17 at WOT when I would have hoped for more. We're not heavily loaded, maybe 160 kg (350 lbs?)
the relatively slow top speed was why I never kept the one I was trying out (a very trusting seller let me have it for a weekend to see if it suited me ).the same 15 hp mercury on the honwave 3.2 airfloor I bought saw over 22 on the gps but on the aerotech no more than 16
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Old 20 September 2015, 12:37   #88
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Wow, that's a huge difference - I know the Aerotec has a 'draggy' hull but 22 kts on a 3.2 with a 15 is superb. Having said that top speed would certainly not be the deciding factor for us in which SIB to go for.

We've hit 18 in perfect conditions occasionally but not as a constant.
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Old 20 September 2015, 13:18   #89
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wasn't knots max I regularly got 22mph 2 up on the ski section across loch ken which is a little choppy .if I went out when it was mirror flat on my own 24-25mph was max couldn't do it in the sea tho unless it was flat calm and I never saw a flat calm sea in it.this was on my garmin plotter fishfinder
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Old 20 September 2015, 14:18   #90
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Just keeping to kts for simplicity (converting beerbelly's figures)...

So Max you're seeing 17kts as a maximum that's reproduced consistently each time you're out??

That does seem a bit down given I'm getting 17.9kts two way runs in a chop with a greater load than you and an 18.6kts with lightest load which at me plus small teen would equate closely to your load.

I don't have a tiny tach so there is just the possibility my motor is revving higher... knowing your boat will be properly inflated the only other factor I could think of would be prop condition... but I guess yours is near new and all shiny black paint like mine... same 9" pitch too??

Beerbelly in kts you're getting 19.12kts on the 3.2 Honwave (your choppy water reading which was my sea condition and I think Max's usual too) which is near identical to the 19.1kts I was getting on the flatter air floor Zodiac 340 Acti-V I used in the same period on the same water as the Aerotec tests.

The Aerotec speed on your test converts to 13.9kts. There was clearly something wrong with the setup or measurement because over the ownership of many SIBs I've found with a properly inflated lightly loaded SIB the speed is pretty consistent across makes/types when used with the same Mercury/Mariner 15hp 2-stroke outboard... usually within a kt or two... never over 5kts down. As an example of this consistancy a figure I have logged back from 2011 is a Zodiac 360 Acti-V with a light load max of 19.9kts on fairly flat water with the same 15hp.
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