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Author Topic:   Whale Tale on 2004 Mercury 90hp 4 stroke
WT posted 08-17-2004 12:39 PM ET (US)   Profile for WT   Send Email to WT  
Has anyone bought this setup to get you on plane sooner? It's aluminum and cost $50.


andygere posted 08-17-2004 07:35 PM ET (US)     Profile for andygere  Send Email to andygere     
I had one on the Johnson 85 h.p. on my Montauk, but it was installed when I bought the boat. The boat had a great holeshot and planed very quickly and was very responsive to adjustments to motor trim. Since I never ran the boat without it, it's unclear how much was motor performance and prop and how much the Whale Tail helped. It also functioned as a handy step for getting in and out of the boat (when the motor was not running of course).
WT posted 08-17-2004 07:43 PM ET (US)     Profile for WT  Send Email to WT     

My 2004 Montauk doesn't plane until 3500 RPM. WOT rpm is 6200 and 41 mph. The dealer says the prop is right for my boat but says I may want the Whale Tail to get on plane faster.

The 2002 and 2003 Montauks plane at 3000 rpm have a lower gear ratios that the 2004's. So my 2004 planes at a higher RPM. (Or vice versa, I'm new to this stuff.)

The problem is if I want to uninstall the Whale Tail I will have 4 holes in the cavitattion plate.

Decisions, decisions.


Dick posted 08-17-2004 09:21 PM ET (US)     Profile for Dick  Send Email to Dick     
The holes in your cavitation plate will not cause a problem. If you don't like the look of bare holes fill them with Marine Tex and a shot of Phantom Black paint to cover them up.

I tried a Dole Fin on my Montauk and didn't get any improvement, took it off an never filled the holes.


WT posted 08-17-2004 09:28 PM ET (US)     Profile for WT  Send Email to WT     
OK, so the holes in the cavitation plate is no big deal.

I guess the next question is if these fins or tails even work.

Thank for any input.


skred posted 08-18-2004 09:07 AM ET (US)     Profile for skred  Send Email to skred     
Well it certainly worked on my 90 Honda / 16 Dauntless. About 2 seconds to plane, and 14-15 mph planing speed (originally 23 mph to plane)actually improved top speed by 1-2 mph. This with the motor in the lowest transom height setting...
WT posted 08-18-2004 08:37 PM ET (US)     Profile for WT  Send Email to WT     
Thanks for the inputs.

After speaking with my mechanic today at the dealer, I have decided not to install the Whale Tail yet.

He thinks I don't need it. The test will be during salmon season when I have 4 guys in my Montauk.


imko posted 08-19-2004 03:34 AM ET (US)     Profile for imko  Send Email to imko     
My 2003 Montauk doesn't plane until 3000 RPM with a 90
4-stroke mercury. The prop i use is a Laser II 13,25 x 20"
With the vengeance (13,25 x 18")it was also 3500 rpm.
Try another prop first. Also youre midrance is much better
with another prop.



FISHNFF posted 08-22-2004 11:23 PM ET (US)     Profile for FISHNFF  Send Email to FISHNFF     
Hello WT,

That is a very nice 170. Very clean rigging. The guys @OMS do good work. I guess that's where you got it. Your first picture looks like the Alameda ramp off Clement. How does your FF read @ high speed. I've always mounted on the Port side. They mounted mine on Port.
I have a 1999 17 commercial with a modified Montauk console and a 1999 Merc 90 4S. Your hull distributes the weight much better.I might have ordered a 30" transom had I known how much water the boat ships while backing down with bait tank and a few guys.
You are right to try without first, but I will say I added a Doel-Fin, and it does help planing and rough water handling. I can trim out farther and mount the motor higher. I also added Lenco tabs, and they help immensely, especially tilting the hull when running across the chop and compensating for load.
I had a 13 with a 50 Yamaha. The boat ran better without, so I left it off and painted the holes.


seasicknes posted 08-23-2004 02:27 PM ET (US)     Profile for seasicknes    
after you mount that whaletail xl and you decide that you don't like it. You can plug the holes up with those automotive plugs. Just go to kraegens and look for them on the display. They come in various sizes and colors.
Find the one that fits your hole and just plug it in.

You won't even notice.


seasicknes posted 08-23-2004 02:34 PM ET (US)     Profile for seasicknes    
I have the whaletail xl on my hydrasports 22 wa.
Also I have a 15 hp honda kicker with a 200 hp evinrude back on the transom.

With the whaletail xl fin, the boat planned faster and cruised at a lower rpm. The ride was much more comfy.

also saved me on some gas. I have a floscan and I noticed it was saving me some gas (gallons per hour)by 1 to 2 gallons per hour saved.

I have noticed a guy at my dock that has a 170 montauk (2003 model). He has a bait well in the back and has a whaletail xl fin. I have not spoken to him as yet.
Since he has that bait tank, i think you would feel that weight on the back. That whaletail xl should help him out alot.

The whaletail xl stabilizer fin is made out of aluminum and extends out behind the motor. If you put your boat in the garage, this may be an issue of trying to walk around the boat.


pvonk posted 08-23-2004 08:13 PM ET (US)     Profile for pvonk  Send Email to pvonk     
Okay, so I'm new at this and I do a search for "Whale Tail" on Google. Oh my! I don't think the "general" meaning of the expression has anything to do with boats!!

seasicknes posted 08-23-2004 11:00 PM ET (US)     Profile for seasicknes
mikeyairtime posted 08-23-2004 11:42 PM ET (US)     Profile for mikeyairtime    
I just ordered a New Zeland made Permatrim for my 170. It was expensive but looks like what I'm after. A big tab with minimum drag. I've got a 27 gallon Pate and I've also got two 9 gallon fuel tanks that I carry in the stern corners (enough fuel for a full day of trolling). I also carry a 28 gallon bait tank for anchovies and sardines and also a ten gallon livewell that I can put on if I want to keep a few mackerel just in case I see a swordfish or marlin while paddy hopping off Catalina island. (who says you can't use a 170 offshore) Needless to say my 170 drags its behind through the water when it's rough and the going gets slow. I'll report back on the installation and performance. I had a Doel Fin on a 22' aluninum lobster skiff and it made a huge improvement when it was rough. It really planted the bow.
seasicknes posted 08-24-2004 08:59 AM ET (US)     Profile for seasicknes    
The permatrim looks very similiar to the whaletail.
Except that the permatrim will use more screws and is powder coated.
Cost a bit more too.
davej14 posted 08-24-2004 09:50 AM ET (US)     Profile for davej14  Send Email to davej14     
Before drilling holes or spending money in New Zealand you may want to consider the "turbolift" fin which clamps to the anticavitation plate without drilling holes. Also not inexpensive, I think about $135.00, but it is fabricated from solid stainless by Grand Island Marine in Florida. You can search this site for lots of comments. Results of adding fins seem to vary widely between boat and motor combinations.

If you want pictures of my installation let me know your e.mail and I will send them to you.

mikeyairtime posted 08-24-2004 05:26 PM ET (US)     Profile for mikeyairtime    
You can get the Permatrim from a guy in San Diego. The holes don't really bother me, that's kind of what I liked about it. The extra mounting holes distribute the load out over the entire cavitation plate and the outer edges of the plate are rolled down for rigidity. Seems like someone actually may have done some stress analysis. Seems like a very stout unit.
mikeyairtime posted 08-24-2004 09:01 PM ET (US)     Profile for mikeyairtime    
I just finished the permatrim install. I just added a foot to my boats length. It looks like something off a work boat, very stout. The dirrections say don't stand on it with the engine running. Pretty cool.

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