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Author Topic:   That 15" Transom Again
VMK posted 04-01-2002 12:05 PM ET (US)   Profile for VMK   Send Email to VMK  
I am about to repower a 1968 13 footer. Is raising the transom to accomodate a 20" shaft engine going to compromise the handling of the hull. The original design is for a 15" shaft although actually a little longer which is normal. My main concern is structural integrity of the transom along with handling and cavitation. Whoever really knows ?
JohnAz posted 04-01-2002 12:41 PM ET (US)     Profile for JohnAz  Send Email to JohnAz     
TRY THIS thread
VMK posted 04-03-2002 02:12 PM ET (US)     Profile for VMK  Send Email to VMK     
I understand that it is acceptable to either build up the transom or use a jack plate. Would I do this because of a greater choice of motors in 20 inch. or is this done to not get stuck with a short shaft motor ?
I am about to order a Tohatsu 40 w trim. It seems to be the only choice in short shaft w power trim. This can be had in either size shaft. Should I order in 15" or Jack up for a 20" and be able to use the motor elswhere if desired.
Flipper posted 04-03-2002 08:52 PM ET (US)     Profile for Flipper  Send Email to Flipper     
VMK,personally, I would try to accomodate a 20" motor and then you'll have the selection. No-setback models of jackplates do exist,if you're concerned about hanging your motor too far back, but I've seen that 15" transom get abused through years of tourboat wakes with no ill-effect(two generations of kids drove our '60s 13, with a 40 on it).
andygere posted 04-10-2002 01:09 PM ET (US)     Profile for andygere  Send Email to andygere     
I'd go with a 15" Tohatsu/Nissan. Installation will be simple, and the boat will look and perform like new. These motors have a good reputation among those who own them. As far as other uses for the motor, it will probably retain more value attached to a 13 Whaler than sold used as a loose motor. What else would you put it on?
Tom W Clark posted 04-10-2002 01:15 PM ET (US)     Profile for Tom W Clark  Send Email to Tom W Clark     

It really up to you. Either way will work. If you haven't looked at this yet, check this repower out:

Personally, I'd take Andy's advice. The Tohatsu seems to be a very attractive motor for a boat like yours. Light weight, available with power trim/tilt, and costs less especially by avoiding the cost of the bracket and all the fooling around with its installation.

By the way, the transom on your boat is a 15" height. Remember you do not measure along the face of the transom which is quite sloped, but rather you measure the vertical distance from the top of the transom to the bottom of the keel.

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