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Old 27 June 2016, 10:39   #1
Country: USA
Town: Lafayette
Make: Avon
Length: 3m +
Engine: Outboard
Join Date: Sep 2015
Posts: 8
Avon RIB 340 Planning issue

I have an Avon R340 with an 1996 2strokes 8HP Johnson about 58lb it ride really nice with one adult, with two or more, it is more like a nice slow cruise. I put on a 1999 Evinrude 4 strokes 15HP about 104lb, but now with one person it really lift the bow out and I either have to sit on the floor or use an extender so that I can move my weight up toward the front more. I have adjusted the engine angle and it seems to be perfectly straight up and down. What else can I do so that I can sit comfortable on the tube and operate the boat by myself? Would whale fin on the engine help with this issue?

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Old 27 June 2016, 12:19   #2
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Nos4r2's Avatar
Country: UK - England
Town: The wilds of Wiltshire
Boat name: WhiteNoise/Dominator
Make: Ballistic 7.8/SR5.4
Length: 7m +
Engine: Opti 225/Yam 85
MMSI: 235090687/235055163
Join Date: Jul 2005
Posts: 12,690
15hp on a 340 should plane easily. I was using one to run up and down the Intercoastal in FL and it planed easily (granted, it was a 2 stroke Yam 15 and it had a whaletail on) with me at the helm and I'm not small. I didn't have to move forward either.
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Old 27 June 2016, 17:05   #3
Ron Noco's Avatar
Country: Ireland
Town: Kerry
Boat name: Independence
Make: FunYak
Length: 4m +
Engine: Honda BF10
Join Date: Jun 2015
Posts: 123

Are all other things equal?
i.e. Same shaft length, does it sit deeper in the water?
What's the Prop diameter & pitch, science in itself as I've been learning
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Old 30 June 2016, 14:32   #4
Country: UK - Wales
Town: Cardiff
Length: no boat
Join Date: Aug 2014
Posts: 940
Run a 25hp on a 340 (console rigged)

And nose does lift, ballast up the bow, with the console it's easy just stand up and lean over the wheel until on the plane/plain then sit down and enjoy with extra body onboard no bother....
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avon, rib

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