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  Trim and porposing with 13

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Author Topic:   Trim and porposing with 13
JimU posted 04-12-2002 11:35 AM ET (US)   Profile for JimU   Send Email to JimU  
I have a 13-4 sport powered by a new 40 yam 2-stroke. it seems as though I have to trim the engine in (toward the transome) an excessie amount in order to avoid porposing when loaded with one person, six gallons of fuel and a battery. Once I'm up on plane, trimming out slightly produces porposing. the trim range seem to be much shorter than with my 16-7 powered with Yam 90. In fact the 16-7operates well with the engine trimmed to a ertical position, while the 13 seems to require a negative trim off the vertical in toward the transome. The 13 has a 20 inch transom and the engine is mounted in the third hole up. How does this square with your experience for 13's? Thanks JIM
PMUCCIOLO posted 04-14-2002 06:09 AM ET (US)     Profile for PMUCCIOLO    

The situation you describe is familiar to me. The 13's my family has had all ran best with a bit of negative trim on the engine. Perhaps relocating the fuel tank (move it ahead of the rear thwart seat if your fuel line permits) may help. That is a simple fix. Moving the battery, although more complicated and permanent, may help as well, especially if the boat is operated solo a lot.

The 16'7" hull with 90HP Yamaha power is similar to the setup on my Alert. Negative trim is not necessary to plane, but a bit helps in a high head wind to keep the bow down when at higher speeds.

With regards to the engine height, I'd suggest your contacting Clark Roberts. He seems to have extensive experience with such matters.


kamml posted 04-14-2002 09:17 AM ET (US)     Profile for kamml  Send Email to kamml     
My Montauk/Merc 90 has a similar situation at speed. No trim up keeps it flat, almost any trim up starts it porposing at half to full throttle. Trim up would probably give me a little more speed. Better weight distribution would probably help. Ken
boxers posted 04-22-2002 09:45 PM ET (US)     Profile for boxers  Send Email to boxers     
I found an amazing fix for this problem we were having too. Our 13 was really hard to trim after we put a 40 Honda on the back. My cousin recommended a fin which mounts on the cavation plate. I couldn't imagine a 35 dollar peice of plastic could TOTALLY TRANSFORM the ride but it did. Try it and you won't be disappointed.
rsgwynn1 posted 04-27-2002 03:54 AM ET (US)     Profile for rsgwynn1  Send Email to rsgwynn1     
Sounds like a Sting Ray you're talking about. Well worth the money.
whalernut posted 04-28-2002 12:02 PM ET (US)     Profile for whalernut  Send Email to whalernut     
I know a guy with a 60`s era `13 Sport and he put a New Honda 40 on it, and man does it sit rear squatty and bow high, I am in the belief that the older hulls are too light for the very heavy 40 4-strokes. For an example my now sold 71` `13 Sport had a 76` 35 Horsepower Evinrude on her and it sat perfectly, I think that old 2 cylinder 35 was just an awsome engine and light to boot. Jack.

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