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  Does a 1968 13' whaler need a 15" or 20" shaft?

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Author Topic:   Does a 1968 13' whaler need a 15" or 20" shaft?
snookfish13 posted 10-05-2003 09:53 PM ET (US)   Profile for snookfish13   Send Email to snookfish13  
I am purchasing a new 15 or 25 hp yamaha for my 1968 13' whaler and need to know if it needs a 15" or 20" shaft. Also, could a 15 hp. get it up to plane?
JBCornwell posted 10-05-2003 11:23 PM ET (US)     Profile for JBCornwell  Send Email to JBCornwell     
Hi, Snookfish.

You need a 15" "short" shaft engine.

Red sky at night. . .

DCM posted 10-06-2003 03:13 AM ET (US)     Profile for DCM  Send Email to DCM     
to answer your second question, My guess is that yes, it would plane with a 20hp. Might take awhile to get there though.

(also owner of a 1968 13' Sport)

Mumbo Jumbo posted 10-07-2003 01:34 AM ET (US)     Profile for Mumbo Jumbo  Send Email to Mumbo Jumbo     
I have a 3 year old 25 hp. four stroke Yamaha with power trim and tilt on a 1973 13 Whaler (transom has been raised to 20"). It has a PowerTec stainless prop (if you need the model#, email me). This is a fantastic engine for the 13. It has planed five average adults (barely) and planes four in small seas. it is the ideal engine for the 13 when used primarily with two or three people. I have taken it over 8 miles offshore. I have owned a 13 of some sort since 1960 and have powered them with motors from 50 hp. to 9.8hp (I also own a 1964 Montauk and 1989 18’ Outrage). I would have no engine but the Yamaha 4 stroke 25. It needs to be mounted about 3" higher than the top of the mounting bracket would suggest. This gives better high end performance and allows the engine to be tilted up to run the boat at idle in less than a foot of water. This is a great feature when noodling about the marsh looking for tailing Redfish at high tide. The power trim feature is mandatory in my estimation since it gives you great control over boat trim which is important for the 13 Whaler when there are two people on the rear seat and two 25qt igloos behind the seat.
snookfish13 posted 10-10-2003 08:08 PM ET (US)     Profile for snookfish13  Send Email to snookfish13     
Thanks for the replies and pictures, I really appreciate it. I'll be buying the motor (25 hp. yamaha) tommorrow afternoon and snook fishing tommorrow night...Just in time for the second half of the mullet run.


Mumbo Jumbo posted 10-11-2003 02:04 PM ET (US)     Profile for Mumbo Jumbo  Send Email to Mumbo Jumbo     

Congrats on the 25. You will need a stainless prop; the stock Yamaha aluminum prop wears down rapidly on the tips when struck by oyster shells and sand. The Powertec props are much more efficient with their well-designed cupped blades and make a tremendous difference in performance.

Mumbo Jumbo posted 10-11-2003 02:39 PM ET (US)     Profile for Mumbo Jumbo  Send Email to Mumbo Jumbo     
Here's the information on the PowerTech prop for the 25 Yamaha 4.

PowerTech Marine
Model # YM30SRA3R11s-2
Stainless 3 blade, 10” dia, x 11” pitch with cup

The price was $242.00 when I bought this prop directly from PowerTech over three years ago. They now list it for $245.00. Their web site mentioned that it was added to the site on 2002. That’s strange since I bought mine in either 1999 or 2000. I also have two friends who have Yamaha 25 four stroke engines on their 13s who use this prop. They are very satisfied with the performance.

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