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Old 19 June 2014, 16:45   #21
Country: Other
Town: Caribbean
Boat name: Rib
Make: Avon
Length: under 3m
Engine: 2.5 Tahatsu outboard
Join Date: Jun 2014
Posts: 106
Originally Posted by jvb View Post
hi ribbers,
i have good experience with simple hydrofoils on my SR5.4 / DT65.
now i am thinking to add them to my 90Merc too, but i heard they might cause the aluminium wings to break off.
do you have any experienced concerns against them?

its the cheap ones…:

thanks again for forums help!


I used doel fins on twin 90hp Mercury outboards on a 22'0" Mako centre console with no damage to the engine.

Also used a set on a 75hp Yamaha powering a Shetland 18 for years with no damage to the engine.
It added about 10-12% to the top speed.

Just follow the instructions.


Doug_G is offline   Reply With Quote
Old 03 July 2014, 18:12   #22
Country: Germany
Town: hamburg
Boat name: Jenny
Make: SR 5.4
Length: 5m +
Engine: Suzuki DT65+Merc90
Join Date: Aug 2009
Posts: 45
hydrofoils breaking aluminium wings?

finally got them in from nzl. costums were a pain... tax and fees and vat on top made them like 280€ in total.
they came without prepared holes.
installation took about 30 min. they sit solid and tight.
did a short testdrive so far only - i can see an improvement for faster planing, yet i would say it is marginal.
i would suppose anything above 50hp doesnt need it really.
having said this, i was alone and boat and tank empty.
shall keep you posted how it goes with passengers and fully loaded.
happy ribbing

jvb is offline   Reply With Quote

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