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Old 02 August 2009, 04:09   #11
Country: UK - England
Town: Buckingham
Make: Ribcraft 4.8
Length: 4m +
Engine: Mariner 75
Join Date: Feb 2007
Posts: 352
Originally Posted by kelson View Post
The Doelfin worked fairly well, but I had to trim the outboard more forward than I would normally to get the fin to have the desired effect at slow speeds.

Smart Tabs ... an excellent way to help a boat get on the plane at slower speeds.
On my Futura Mk 2, I ended up doing lots of manual trim adjustment last week with the Doelfin - not good !

How slow can you get on the plane with the Smart Tabs ?

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Old 02 August 2009, 04:36   #12
Country: UK - Wales
Town: Southampton
Boat name: DynaMoHumm/ SRV/deja
Make: Avon8.4, 5.4 & 4.777
Length: 8m +
Engine: Cat3126 Yam 90 &70
MMSI: 42
Join Date: Dec 2003
Posts: 6,556
It would be tabs for me.

I don't like the thought of drilling holes and bolting on extra stress point to the AV plate.

Here it comes again, I don't stand a chance
Soul possession, Got me in a trance
Pullin' me back to you - Deja Voodoo
Rogue Wave is offline   Reply With Quote
Old 03 August 2009, 03:46   #13
Country: UK - England
Town: Bucks
Boat name: Spare Rib
Make: Zodiac/Bombard
Length: 6m +
Engine: 90hp Yamaha
Join Date: Feb 2003
Posts: 157
Originally Posted by BumbleAbout View Post
How slow can you get on the plane with the Smart Tabs ?
Haven't got them yet but hoping for 10-12 kts.

I have 6m RIB with Yammy 90. I haven't done this very accurately but on flat water (tidal Thames) 18kts seemed to be the lowest speed at which I was 'properly' planing. On the sea I was planing at lower speed, maybe 12-15 kts. That seems counter-intuitive so possibly it was my feel of where the boat was comfortably planing was a bit different.

I've ordered the Smart Tabs with the optional retractor plate kit, so, when I have them fitted, I'll be able to test with tabs and without in identical conditions.
Tim Spring
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Old 03 August 2009, 15:46   #14
Country: UK - England
Town: Fareham
Boat name: Wave Glider
Make: Cobra 7.55
Length: 7m +
Engine: Suzuki 250
Join Date: Sep 2004
Posts: 118
I used the doel fins on an Avon 5.45 Seasport I owned once on a mariner 90HP, the arrangement on that boat is that you are sitting at the back, I kept it on the hamble and on the long wind up the hamble I often went out on my own, about 4 / 5 knots you couldnt see over the bow when seated!

Once I fitted the doel fins they were amazing, minimal bow lift, faster planing and vision at lower speeds! Made no noticable difference to the top end. Sure if you are launching the boat out of the water off waves and totally being airbourne i am sure the extra platform on he cavitation plate would not be good for transom etc but that is not my normal ribbing so they worked well for me :-)
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Old 04 August 2009, 04:23   #15
Simon B's Avatar
Country: UK - England
Town: Leicester
Boat name: Vixen
Make: Ribcraft
Length: 6m +
Engine: Suzuki OB 175
MMSI: 235071839
Join Date: Jun 2004
Posts: 1,621
We used Tigershark VG fin on last boat and it did work well, however, I do still dislike the idea of drilling the AV plate. I'm sure if fins were the best solution the tab manufacturers what be out of business.

The replies so far have certainly tipped me toward favouring tabs, we haven't taken delivery of the boat so we do not know yet whether we will need anything, forwarned is forarmed.

New boat is here, very happy!
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