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  New 15 ft GLS with 60 Yami 4 stroke performance lackluster, suggestions?

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Author Topic:   New 15 ft GLS with 60 Yami 4 stroke performance lackluster, suggestions?
4whaler posted 07-05-2003 11:39 PM ET (US)   Profile for 4whaler   Send Email to 4whaler  
Ok, got new boat put in today first time, performance not up to old. Sold old of same type, this is 2003 15 ft. GLS II with 4 stroke Yamaha 60 hp. Old is GLS I 1991 with 1993 Evinrude 60 hp 2 stroke. This new one is a beauty but my old will run circles around it????

This one has a 244 lb engine set at about 2 inches above engine lip on transom which puts cavitation plate about 1 inch from bottom of boat maybe a little lower. Can not lower any more with out re-drilling as lower bolts are in top of slot. Got more holes on engine to lower but would rather work other solutions first. Besides everyone seems to be going to higher engines. This one runs out of down trim before porpoiseing settles out. Reqires person forward on hatch to get to really settle down.
Prop is 10.5 x 13 stainless. RPM is WOT at 5300 with two pax and 10 gal fuel, manual says 5500-6000 range. Seems I need to drop a pitch or two and maybe get a larger diameter prop? Or go the Dole fin approach to get a decent hole shot and the bow down. My old one runs like on a rail after jumping out of the water when trottle pushed down. Suggestions?

Clark Roberts posted 07-06-2003 07:56 AM ET (US)     Profile for Clark Roberts  Send Email to Clark Roberts     
Suggestions: break engine in per mfg recommendations; raise engine so that anti-cavitation plate is 1" to 1 1/2" above keel; install doel-fin; check that engine is getting full throttle (look down carb throats); select prop which allows rev to max (6000-6200) lightly loaded; etc, etc... that new 15 is heavier than the old one (don't know by how much).. keep us posted and good luck... Clark
jimh posted 07-06-2003 09:45 AM ET (US)     Profile for jimh  Send Email to jimh     
I am confused because I don't see any mention in the Boston Whaler catalogue for 2003 of a 15-GLS model.

Perhaps you are talking about the 150-SPORT model, but you have decided to give it a new name. Can you clarify the boat to which you refer?

4whaler posted 07-06-2003 10:11 PM ET (US)     Profile for 4whaler  Send Email to 4whaler     
Its really an Alert 15 done to look like a GLS II. This will be the last of her kind as I under stand Boston Whaler destroyed the molds for the interior after doing 3 this year, mine was one. Apparently someone decided that they didn't want this to get to popular and step on sales of the new 15 ft. Slug.

See pic...
Hyperlink

jimh posted 07-06-2003 11:06 PM ET (US)     Profile for jimh  Send Email to jimh     
Thanks for the clarification. The 15-foot hull has been a great one.

Did you order the boat from the recreational division or from the Government and Commercial division?

4whaler posted 07-06-2003 11:45 PM ET (US)     Profile for 4whaler  Send Email to 4whaler     
This boat was ordered from Commercial/Govt Unit of Boston Whaler by the original owner who frequents this board. It is done top notch, inculding a 15 gal Pate under the helm seat and Mills canvas. He fell in love with a BW Vigilant class and is pursuing that. I picked this up after conversing with him about the project as he put it together. He did it exactly like I would have done it. So I decided to go for this new one when he put it up. He actually had the hull offered up before power and I didn't bite, but after seeing it all rigged out just like I would have done, engine hp and type and all I couldn't resist when he decided to sell to get going in cash to get the Vigilant. I made out, he did all the work, but I think he is like me a little in that the chase is better than the kill?
lhg posted 07-07-2003 03:41 PM ET (US)     Profile for lhg    
Is this PMUCCIOLO'S new 15 Alert/GLS interior? If so, there is tons of discussion on it prior to selection of the Yamaha 60.

Looks like a very nice boat.

4whaler posted 07-07-2003 04:38 PM ET (US)     Profile for 4whaler  Send Email to 4whaler     
Bingo! You nailed it. And its all mine... =:) and now resides in North Alabama.
DaveNJ posted 07-10-2003 07:37 AM ET (US)     Profile for DaveNJ  Send Email to DaveNJ     
4whaler -

Thanks for providing the picture. It is a great looking boat. The Alert 15's are done in haze gray ?

What do you mean by the term, "....the new 15' Slug.." ?

- Dave

Wild Turkey posted 07-10-2003 10:29 AM ET (US)     Profile for Wild Turkey  Send Email to Wild Turkey     
Dave:

I understand that the Commercial/Govt division can produce hulls in a variety of different colors.

I remember Bigshot stating they could even produce one with a pinkish color (which he would prefer)!

4whaler posted 07-10-2003 11:20 AM ET (US)     Profile for 4whaler  Send Email to 4whaler     
This boat was a custom ordered Alert 15 hull and they painted it in white as requested. I do also understand they will paint in just about any color you want, Ive seen OD green, blue, sea green, black, gray, tan, red and the white. Probably some others our there too.

The owner of this boat before I got it coined the phase "Slug" for the new 15 ft Whaler. He made reference to its performance with the mandaded Merc compared to the classic 15 based on a test ride. He is very demanding of his boats performance and construction but conservitive in his use of them from what I can tell. And he was not impressed with the new 15, hence his reference to it being a "Slug"

Bigshot posted 07-10-2003 11:38 AM ET (US)     Profile for Bigshot  Send Email to Bigshot     
With a 60 compared to your boat....it is a slug. Not a bad slug but more sluggish being it weighs 400lbs more.
Barney posted 07-10-2003 06:23 PM ET (US)     Profile for Barney  Send Email to Barney     
It looks sharp!
jameso posted 07-12-2003 03:06 PM ET (US)     Profile for jameso  Send Email to jameso     
What is your top speed via GPS? With the extra weight of commerical hull 33 34 should be in range. I am running a 14 pith pushed by 50 Honda horses it will do 34/35 at at at WOT. 6000 RPM trimmed out.
Jim Armstrong
4whaler posted 07-13-2003 12:03 AM ET (US)     Profile for 4whaler  Send Email to 4whaler     
No gots insturments yet except for digital tach. Its max is 5300 RPMs with two pax WOT. Owner said he got 5700 RPM solo WOT. Checked engine mounting and cav plate is flush with bottom. Got new prop, transom wedges and turbo lift all in bound. Going to try the new prop first, then the turbo lift. Then maybe go up a hole and then the transom wedges? Feels ass heavy compared to my old one and transom dain holes are about half under water at rest. Engine is heavy but only about
14 lbs more than 50 HP. Thinking about moving seats and console forward about 6-8 inches, maybe a foot to put more weight forward if these new items don't fix. Worst case I lose the 4 stroke for a 2 stroke, maybe even a 70. Probably get even trade?
jameso posted 07-14-2003 09:41 AM ET (US)     Profile for jameso  Send Email to jameso     
IMHO, the last thing, the very last thing to do is put a fin type device on the engine. The cav plate should be at least an inch above the faired bottom. Raise the engine, reprop and try again. Are the transom scuppers just above the waterline with no one aboard? On my 15 Sport they are about an inch above waterline, on my 15 SS LTD they are within 1/4 inch or so. The SS does have more weight in the stern. You can try moving some things closer to the pointy end.
I am going to try to post some performance figures for the Honda/SS LTD package soon.
Jim Armstrong
skred posted 07-14-2003 10:49 AM ET (US)     Profile for skred  Send Email to skred     
If this helps: My '85 15 CC is repowered with a 2001 Merc 50 4-cycle, and GPS with 245-lb. me, 12 gals fuel, cooler, etc. is 38 mph @ 5800 rpm, with standard 14-pitch aluminum prop, and cav plate 1.5 in. above hull...
4whaler posted 07-19-2003 11:37 PM ET (US)     Profile for 4whaler  Send Email to 4whaler     
Update: Ran boat yesterday evening with new black stainless prop, a 11 1/2 x 13 much better rpms, up to 5800 WOT. Nose didn't come up so high and stern didn't dig in so much. Still porpoises a little but took engine transom down stop pin out and got a little more trim down and that helped dampen almost out. Jacked engine up one hole and performance was about same, cav plate now 1/2 inch above bottom. Didnt break out during turns WOT so Im going to raise up to last hole available which will put cav plate 1 inch or so above bottom. I don't understand why a 1 inch large diameter prop of the same pitch turns faster unless the rake is major different agressive on the bright stainless? Still got a turbo lift plate coming and have some transom wedges to try too if necessary. A 11 1/8 x 12 SOLAS alumin prop might just be the ticket? More later.
Sal DiMercurio posted 07-20-2003 12:12 PM ET (US)     Profile for Sal DiMercurio  Send Email to Sal DiMercurio     
Somethings wrong here.
If that engine can only twist a 10.5 x 13 to 5,300 rpms, going to a 11.5 x 13 sure wouldn't allow the engine to gain 500 rpms.
My guess is, the 10.5 x 13 is marked wrong & is actually a 10.5 x 16
Diameter dosen't effect the rpms near as much as pitch, so going to the 11.5 x 13 [ 1 inch more dia the the 10.5 ] if anything, should bring the rpms down a "bit", not run 500 more.
Sal
4whaler posted 07-21-2003 11:46 AM ET (US)     Profile for 4whaler  Send Email to 4whaler     
Sal
Yeah confused me too? The Stainless is a nice looking prop but its packed up and headed back to dealer today. Im sticking with the new one. Still going to buy a spare of something so may experiment with slightly different one. The SOLAS 11.1 x 12 alum. can be had for around $100 new. Guy on ebay had a 11.1 x 13 up and I dialoged with him about performance and he said he had it on a 16 ft runabout and went to the x 12 and the boat performed better. He suggested I try the x 12 instead of buying his x 13. Nice chap that! Other board member is running a 14 pitch stock alum. on his 50 Merc 4 stroke on a 15 CC and is getting almost 40 mph and very good performance. I think you may be right about the prop marking???
4whaler posted 07-28-2003 10:30 AM ET (US)     Profile for 4whaler  Send Email to 4whaler     
Well this information from Boston Whaler may go a long way to help explain some of the lack of performance compared to my old GLS I. Seems like the Alert hull this GLS II is built on is built like a tank. Compared to the weight numbers in the reference section for a 15 ft classic hull (600lbs) the Alert bare hull is some 450 lbs heavier!! Its like having two people on board already when starting. Here is the response I got back from Boston Whaler when I asked about hull weight and max engine weight and HP.

"
Rob,
Bare hull weight =1055 LBS.
With side console and moderate options ( no motor ) 1500 LBS.
20" Shaft needed to install
Minimum HP =20 HP ( SLUG ! )
Max Recommended is 70 HP with side console( 38 to 40 top MPH average, ).
45 HP with tiller control
Max engine weight=264 LBS.

Great boat, I own one.

Dave Clair
Customer Service /Parts & Accessories/Tech Support Rep.
Boston Whaler Commercial & Government Products, Inc.
420 Megan Z Avenue
Edgewater, FL 32132
"

4whaler posted 07-28-2003 02:08 PM ET (US)     Profile for 4whaler  Send Email to 4whaler     
Boy this board is great... I pinged Dave @ Boston Whaler on the weight issue after getting email saying "no way Jose".... on the 1055 lbs. Turns out that is the max weight capacity. See text..
"
Yep ,
I goofed .
The weight I gave you is max weight capacity.
The correct hull weight is 615 pounds bare hull.
Add options and engine weight and go from there.
Sorry about it !


Dave Clair
Customer Service /Parts & Accessories/Tech Support Rep.
Boston Whaler Commercial & Government Products, Inc.
420 Megan Z Avenue
Edgewater, FL 32132
"

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