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Upgrading-Long Shaft vs. Short Shaft

trout tracker I'm looking to repower my 14' Sea-Nymph 14R with a Honda 15 H.P. and just wanted to know any considerations I may be unaware of about using a long shaft vs a short shaft outboard. Thanks in advance for your help and tight lines to all! [Razz] 2002-04-07
J.B. Cornwell Howdy TT.

You need to use the one that matches your transom height. Short=15", Long=20"

Red sky at night. . .
JB [Smile]
2002-04-07
Forktail The Honda 15 you want to re-power with can come in a short (15" shaft), long (20" shaft), or extra long (25" shaft).

All 14' Sea Nymphs (Lowe/Genmar) either have transoms for 15" or 20" shafts with hp ratings from 15 to 30 depending on model.

Here's their web site to check your model:

http://www.lowe.com/FishBoats/Utility/SeaNymph/

Or...you can always measure the transom itself. It should be either 16" or 21".

The only disadvantages to using a long shaft on a short shaft transom are more water drag by the extended shaft which means slightly slower speeds, a little added weight, the inability to run in shallower waters, and a bit more expense in fuel use and purchase price. Otherwise you won't hurt a thing.
2002-04-07
petryshyn J.B. is right. You must match your transom. A long shaft motor put on a short transom can cause grief. I've seen water curl in and flood a friends boat cause of too much engine in the water....
Even in a small HP engine, the extra drag from too much in the water will slow you down.....
2002-04-07

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Outboard Motors

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