Heres the deal on the Doel-fin

Heres the deal on the Doel-fin

Post by David Grabows » Wed, 02 Aug 2000 04:00:00


I posted here a couple of weeks ago about the thought of installing a
Doel-Fin on my 14ft. aluminum boat with the bigfoot 15 hp Mercury four
stroke motor. Things were on hold due to some surgery I had and as of
yet I hadn't run the brand new boat with tiller steering alone. I had
also called Mercury and they don't like adding fins to their lower
units. Well since then I have now been able to get out in the boat
alone and found that it will plane after a huge nose high attitude on
initial throttle up, from there it runs on  plane with trigger sharp
steering, this is with nothing else in the boat but me and a fuel tank
and with maximum trim set at the trim adjustment to aid in keeping the
nose down. I'm sure it will be a bit better with maybe a trolling
motor up front and installing a battery up under the front seat and
maybe moving the fuel tank forward to the next set of ribbing or mid
seat.

So, now my question is what about with added people or load
distribution in the boat and using the Doel Fin ? How will this effect
the handling loaded, I feel confident that the fin would only enhance
the one person load of me alone . See the engine is brand new, Mercury
says they can give me warranty hastles if something goes wrong with
the lower unit and they find the holes drilled in there, so I'm
hedging on doing this. At the same time many people seem to love these
things.

A guy with no experience with lower unit fins,
David Grabowski

 
 
 

Heres the deal on the Doel-fin

Post by Bassman1 » Wed, 02 Aug 2000 04:00:00

Hi Dave and NG,
  Well, at least you answered one question I have about adding a Doel Fin to a
99 Merc25HP still under warrantly.  I guessed that adding one might have some
effect on the warranty.  I use a Doel fin on a 9.9HP Merc mounted on a 14 foot
FG skiff.  The Doel fin certainly improves the bow up problem with two people
aboard.(Heavy Weights).  I haven't ried it when I am alone as I never go out
alone in the boat.  The boat won't plane either with the Doel fin or without it
as you need 15HP to plane based on my prior experience.  I have the Doel fin
but based on your information about the possible warrantly problems I am not
going to mount it until  the motor is out of warranty.  I wonder if you knew
that Mercury offers an extended warranty?

Best regards- John

 
 
 

Heres the deal on the Doel-fin

Post by Dudley Cornm » Wed, 02 Aug 2000 04:00:00

Quote:

> I posted here a couple of weeks ago about the thought of installing a
> Doel-Fin on my 14ft. aluminum boat with the bigfoot 15 hp Mercury four
> stroke motor. Things were on hold due to some surgery I had and as of
> yet I hadn't run the brand new boat with tiller steering alone. I had
> also called Mercury and they don't like adding fins to their lower
> units. Well since then I have now been able to get out in the boat
> alone and found that it will plane after a huge nose high attitude on
> initial throttle up, from there it runs on  plane with trigger sharp
> steering, this is with nothing else in the boat but me and a fuel tank
> and with maximum trim set at the trim adjustment to aid in keeping the

I hope you mean maximum down or maximum in...

Quote:
> nose down. I'm sure it will be a bit better with maybe a trolling
> motor up front and installing a battery up under the front seat and
> maybe moving the fuel tank forward to the next set of ribbing or mid
> seat.

> So, now my question is what about with added people or load
> distribution in the boat and using the Doel Fin ? How will this effect
> the handling loaded, I feel confident that the fin would only enhance
> the one person load of me alone . See the engine is brand new, Mercury
> says they can give me warranty hastles if something goes wrong with
> the lower unit and they find the holes drilled in there, so I'm
> hedging on doing this. At the same time many people seem to love these
> things.

When does your engine waranty run out? I might wait until then.

dsc - acssysdsc

 
 
 

Heres the deal on the Doel-fin

Post by David Grabows » Wed, 02 Aug 2000 04:00:00



Quote:

>> I posted here a couple of weeks ago about the thought of installing a
>> Doel-Fin on my 14ft. aluminum boat with the bigfoot 15 hp Mercury four
>> stroke motor. Things were on hold due to some surgery I had and as of
>> yet I hadn't run the brand new boat with tiller steering alone. I had
>> also called Mercury and they don't like adding fins to their lower
>> units. Well since then I have now been able to get out in the boat
>> alone and found that it will plane after a huge nose high attitude on
>> initial throttle up, from there it runs on  plane with trigger sharp
>> steering, this is with nothing else in the boat but me and a fuel tank
>> and with maximum trim set at the trim adjustment to aid in keeping the

>I hope you mean maximum down or maximum in...

It's set so the lower unit is closest to the stern when I run it
alone, one notch back with two people in it . If I move it back more
with two people in the boat the front starts to lighten up a bit more
than it needs to but that's with no more gear added, just us and a
fishing rod or two.

Quote:

>> nose down. I'm sure it will be a bit better with maybe a trolling
>> motor up front and installing a battery up under the front seat and
>> maybe moving the fuel tank forward to the next set of ribbing or mid
>> seat.

>> So, now my question is what about with added people or load
>> distribution in the boat and using the Doel Fin ? How will this effect
>> the handling loaded, I feel confident that the fin would only enhance
>> the one person load of me alone . See the engine is brand new, Mercury
>> says they can give me warranty hastles if something goes wrong with
>> the lower unit and they find the holes drilled in there, so I'm
>> hedging on doing this. At the same time many people seem to love these
>> things.

>When does your engine waranty run out? I might wait until then.

Most likely this is what I will do, wait for the warranty to run out,
that will be in two years for the standard warranty.

David

- Show quoted text -

Quote:

>dsc - acssysdsc

 
 
 

Heres the deal on the Doel-fin

Post by Dudley Cornm » Thu, 03 Aug 2000 04:00:00

Quote:




>>> I posted here a couple of weeks ago about the thought of installing a
>>> Doel-Fin on my 14ft. aluminum boat with the bigfoot 15 hp Mercury four
>>> stroke motor. Things were on hold due to some surgery I had and as of
>>> yet I hadn't run the brand new boat with tiller steering alone. I had
>>> also called Mercury and they don't like adding fins to their lower
>>> units. Well since then I have now been able to get out in the boat
>>> alone and found that it will plane after a huge nose high attitude on
>>> initial throttle up, from there it runs on  plane with trigger sharp
>>> steering, this is with nothing else in the boat but me and a fuel tank
>>> and with maximum trim set at the trim adjustment to aid in keeping the

>>I hope you mean maximum down or maximum in...

> It's set so the lower unit is closest to the stern when I run it
> alone, one notch back with two people in it . If I move it back more

I'm still confused with your terminology... the boat will plane best
with the drive closest to the stern (most cases). It will probably run
it's fastest speeds with the drive moved one or more notches away from
the stern. I don't understand why you tuck it in more when alone than
you do with 2 people in the boat?

Quote:
> Most likely this is what I will do, wait for the warranty to run out,
> that will be in two years for the standard warranty.

If nothing goes wrong with it in the first 6 months or year, *probably*
nothing will go wrong with it in the second year. I might go on and
install the fin at that point and take my chances.

dsc - acssysdsc

 
 
 

Heres the deal on the Doel-fin

Post by David Grabows » Thu, 03 Aug 2000 04:00:00



Quote:




>> It's set so the lower unit is closest to the stern when I run it
>> alone, one notch back with two people in it . If I move it back more

>I'm still confused with your terminology... the boat will plane best
>with the drive closest to the stern (most cases). It will probably run
>it's fastest speeds with the drive moved one or more notches away from
>the stern. I don't understand why you tuck it in more when alone than
>you do with 2 people in the boat?

THe boat planes just fine with two people in it with the trim set one
notch out , I assumed that since at two notches out the bow gets a bit
light with two people in it, I might just as well set it on the first
notch (closest to the stern) with me alone in the boat since the bow
would already be light with no person sitting there. Setting the trim
on the first notch will set the bow down in the water a little tighter
than at two notches out, I'm also assuming.  Anyway, the boat planes
with me alone in it with the trim set at the first notch but I
wouldn't want the steering any touchier, this tells me the bow is
still light  and since hitting swells from other boats lets it porpose
a little , then i guess this all it will do without balast or the fin.

Quote:

>> Most likely this is what I will do, wait for the warranty to run out,
>> that will be in two years for the standard warranty.

>If nothing goes wrong with it in the first 6 months or year, *probably*
>nothing will go wrong with it in the second year. I might go on and
>install the fin at that point and take my chances.

Well  too, I just came from the dealer and if for some chance
something went wrong with the lower unit I would be taking it to them
under warranty anyway, it's unlikely mercury Marine would ever see the
problem, the dealer would just handle it.

Also, since this is the bigfoot version and even the man at  Merc
defended this view, it's very unlikely I will have trouble with the
lower unit to begin with, this is a lot heavier duty lower end than
the standard four stroke right up front. The big foot is made to work
with bigger loads than I am likely to put on it, even with the fin.
both Mercury and the dealer agree that this is the better unit of the
two.

Well when I'm alone in the boat I'll just throw a cooler full of water
in the bow for now, till I sort this out.

Thanks for the replies,
David

Quote:

>dsc - acssysdsc

 
 
 

Heres the deal on the Doel-fin

Post by Dudley Cornm » Thu, 03 Aug 2000 04:00:00

Quote:
> Well when I'm alone in the boat I'll just throw a cooler full of water
> in the bow for now, till I sort this out.

Now you know why they invented power trim... :)

dsc - acssysdsc