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Author Topic:   Whaler 13' w/ 4 strk Yamaha 15 hp
vdbgroup posted 06-28-2002 12:33 AM ET (US)   Profile for vdbgroup   Send Email to vdbgroup  
I am about to bite on a nice restored 1969 Whaler w/ transom modified to 20". I have a 2000 15 hp Yamaha, tiller, electric start (110 lbs) that I would like to run on this boat. Battery, 3 gal tank, standard twhart seat arrangement and one fishing buddy will be usual load. I have been on 13' one time, but it was loaded with people transporting to and from yacht, so I don't know how these boats perform overall. ( NO need to go into perfomance details of this hull, just question below)

?? What perfomance can I expect with 15 hp on this boat with load as described above ??


jimh posted 06-28-2002 12:56 AM ET (US)     Profile for jimh  Send Email to jimh     
I am sorry to say that I don't have any info available on the performance of the 13-foot hull with various horsepower motors. If anyone has a brochure from Whaler that lists this info I would appreciate having the data sent in so I could add it to the Reference section for the 13-foot hull.

I do note that the SPECIFICATIONS section lists the minimum HP to plane a 13-foot hull as 20-HP, so I think you will find your boat unable to plane with a 15-HP engine.

Lil Whaler Lover posted 06-28-2002 06:24 AM ET (US)     Profile for Lil Whaler Lover  Send Email to Lil Whaler Lover     
If I remember right the literature that I sent to Tom Clark says that an original 13' whaler should plane with up to 3 people aboard with a 10 hp outboard motor. The minimum recommended power was a 9 hp.

Last year I had a 13 with a 9.9 Evinrude 4-stroke. It ran out at 20 mph on my GPS amd planed with three adults if the load was distributed forward. The acceleration was woefully slow though. I know propping it down 1 or 2 inches in pitch probably would have improved the all around performance considerably.

vdbgroup posted 06-28-2002 08:20 AM ET (US)     Profile for vdbgroup  Send Email to vdbgroup     
The Whaler specs indicate max hp recommendation of 20 hp for manual steering and 40 hp for remote.

The hull only weighs 300#, so it should run OK with a 15 hp 4 strk.

LIL Whaler makes a good point in that it make take a little less pitch on the prop to shoot the hole quicker w/ load. I am impressed at 20 mph clock speed with 9.9 hp with load. Impressive.

Any one else?

Appreciate the info.

JFM posted 06-28-2002 08:37 AM ET (US)     Profile for JFM  Send Email to JFM     
If you want the facts here they are:
From BW 1998 catalog; 13 GLS weight 360, min.hp 9, max hp 40. same specs. for the 13 Anniversary. I agree you may be able to plane with as much weight shifted forward as possible. After you plane you may able to rebalance weght with out coming off. Regards, jay
timbo posted 06-28-2002 01:17 PM ET (US)     Profile for timbo  Send Email to timbo     
Here is a suggestion, I'm not sure how much money you want to spend and I know you don't want the 15 to go to waste by not using it, but if your looking for a little whaler that is gonna get you and those 3 people home every time, you may want to search the market for a boat with more substantial power. On the setup your working on now, not only are you not going to be getting the performance edge, but your also putting a large amount of strain on the small outboard by making it push that kind of load. Also I like to sit with a steering wheel while driving my boat. I dont live on a glass smooth lake though. Just some ideas to kick around. Do what will make you happy and will comply with your budget. I got a real good deal on my boat. I got a 73 13' sport with a 91 40 yamaha in absoulutly mint condition for 3500. Safe boating.
BOB KEMMLER JR posted 06-28-2002 01:53 PM ET (US)     Profile for BOB KEMMLER JR    
I bought my dad a 1969 13 sport last year for his birthday and the only motor we had was a 1989 15 gamefisher(aka force aka chrysler?)and with me at 200lbs and my dad at230lbs the boat really didnt seem to plane off,it was almost there and if dad would have moved forward,it might have.He had the console model and i was using the tiller steering with a extension,so my weight was forward,my opinion is if all you want to do is fish,its fine but no speed demon.We replaced it with a 1962 40hp evinrude and it flys!!
vdbgroup posted 06-28-2002 08:00 PM ET (US)     Profile for vdbgroup  Send Email to vdbgroup     
I have run the 15 hp 4 stroke on a 15' flatbottom alum. boat weighing 300# and it ran -22 mph.

Hole shot, planing characteristics, cruise, and any other considerations you 13' Whaler folks can offer are appreciated.

With such a nice, quiet four stroke, I would enjoy putting around in this boat in the rivers and lakes and bays. Kinda of a slow down and smell the "roses" scenario.

I am not concerned about top end. I already have a Montauk and Outrage to take more hair off my head, so I don't have the "Need for Speed".

Clark Roberts posted 06-29-2002 08:53 AM ET (US)     Profile for Clark Roberts  Send Email to Clark Roberts     
VDB, try it out and us know how it goes! My bet is that it will perform nicely with one or two aboard. I have run 13's with as little as a Merc 9.9hp and it would scoot along fine (maybe 15-18 mph) with two aboard. You may need to experiment with props a bit to get best performance. Go for it! happy Whalin'... Clark... SCN
Kelly posted 06-30-2002 09:35 AM ET (US)     Profile for Kelly  Send Email to Kelly     
I have a 15 hp Nissan 2 stroke tiller on my 13'and it does fine. Have never clocked it, but the wake is flatened out and we feel like we are ziping along bouncing on waves with me and 2 children. Just over 300 pounds including me. I'm a little over 2/3 of that. If I had remote steering it would be even better. Kelly
Tom W Clark posted 06-30-2002 11:48 AM ET (US)     Profile for Tom W Clark  Send Email to Tom W Clark     

The answer to your question is that Whaler claims the performance of the 13 with a 10 hp motor will be 16 mph and the performance with a 20 hp motor will be 25 mph.

These figures are from the 1974 Whaler catalog are are for non propshaft rated outboards of that era, so a modern 15 hp power head rated motor may perform more like an 18 hp from then.

If you interpolate from that data you might estimate your boat would do about 20 mph. But the fact the Whaler catalog has the 13 doing 25 mph with a 20 hp motor makes me think those figures were had with a very light load as I know it usually takes more like 25 hp to get to 25 mph. So maybe a little less that 20 mph with your fishing buddy and battery.

The boat should plane easily. The 13 has a minimum hp rating of 9.5 hp.

I do know that a waterlogged 13 Whaler that weights 1100 pounds with a 9.9 hp motor will not plane...

vdbgroup posted 07-01-2002 08:57 PM ET (US)     Profile for vdbgroup  Send Email to vdbgroup     
Thanks for the good information.

I would like to be able to cruise at around 18 mph. I expect top end at 22 mph.

Will find out soon.

Happy 4th of July.

LKS posted 07-01-2002 09:26 PM ET (US)     Profile for LKS  Send Email to LKS     
Don't want to burst your bubble, but I doubt you'll get that much out of a 15 hp on a 13'. We're running a Merc 15 on an 11' and it doesn't want to plane with two adults. With a single light-weight teen (~ 100 lbs.) it scoots. But put more than 200 lbs. aboard and it doesn't want to plane. But, please, let us know how your experiment with the 15 turns out. -- LKS
vdbgroup posted 07-02-2002 12:02 AM ET (US)     Profile for vdbgroup  Send Email to vdbgroup     
I am surprised you cannot plane w/ 15 hp on an 11 footer. Something ain't right.

Clark Roberts posted 07-02-2002 07:05 AM ET (US)     Profile for Clark Roberts  Send Email to Clark Roberts     
LKS is right! I have owned several 11's and none performed well with a 15hp with more than one aboard. An eleven will plane with 15 hp and two adults if one sits forward... seems as the planing surface is too short and narrow???? I ran a tohatsu 18 that did better than the 15 OMC's and 15 Mercs but still required one adult to sit forward to plane! I had one with a 25 Merc (remote steering) that would plane with two adults sitting in stern but it was not snappy and 25 is overpowered (per the rating). My last eleven (page 28 Cetacea) was set-up with single helm seat and passenger seat in front (built-in) of center console... this I did so that two adults could not sit in stern and passenger had to sit forward... this rig would plane fine with two adults due to this weight distribution! It has been my experience that a 13 will perform better (with same power) than the 11' maybe because the 11 was designed primarily as a tender! The 11 is a great little boat in any case and great for kids! Happy Whalin... Clark.. Spruce Creek Navy
Chris posted 07-03-2002 05:06 PM ET (US)     Profile for Chris  Send Email to Chris     
I had a 1968 13 Sport with a 1979 15 Evinrude. It planed with ease with two adults (about 320 lbs) a six gallon tank and a small cooler in the back. I enjoyed the setup did alot of fishing and it was great on gas.
JohnAz posted 07-03-2002 06:12 PM ET (US)     Profile for JohnAz  Send Email to JohnAz     
The 11 might be harder plaining with a load than the 13, becaus of less bottom area,,kina like thin water skis

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