Adding Hydro Foil to Yamaha 8 HP 4 Stroke on 27 Catalina - Page 2 - SailNet Community
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post #11 of 27 Old 04-02-2013
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Re: Adding Hydro Foil to Yamaha 8 HP 4 Stroke on 27 Catalina

The trim of the outboard is one place to look, as mentioned above.. If by 'foil' you mean those fins they add to outboard cavitation plates, that might be worth investigating, but I'd be skeptical.

You may be powering on too hard (and likely not gaining any speed anyhow) so throttle back to reduce the 'squat' and see if things go better then. But also check the trim pin on the clamp bracket.. if the motor is tilted up aft, that will promote the 'squat' that's giving you problems. Try going to the lowest pin setting there.

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Re: Adding Hydro Foil to Yamaha 8 HP 4 Stroke on 27 Catalina

I believe i was already on the lowest pin on the trim bracket. Yes i was talking about the fin looking things.

If they work on other boats I cant see why it would not help even a little bit. A cheap expense for even an inch of additional room.

I cant seem to find anyone that has one on a sailboat though. I surely cant be the only one with this issue with my cat 27?
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post #13 of 27 Old 04-02-2013
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Re: Adding Hydro Foil to Yamaha 8 HP 4 Stroke on 27 Catalina

not the only one with the issue. outboard powered sailboats have limitations on the conditions that it is safe to operate in. so far has the engine you have been a problem or is it that you are just worried about a problem that does not exist. if you find that going at top speed is drowning your motor then don't go that fast. problem solved.

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Re: Adding Hydro Foil to Yamaha 8 HP 4 Stroke on 27 Catalina

Im concerned about what could happen. My motor is running fine. I have never owned a outboard sailboat before. Need to figure out its limits.

Even a slight wave like .5-1ft is concerning.
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Re: Adding Hydro Foil to Yamaha 8 HP 4 Stroke on 27 Catalina

I'd experiment with the throttle and the knotmeter... back off until the 'squat' eases up some, and see if you really lose any significant speed. Displacement hulls pushed to that squat position often don't gain any real speed... they just burn more fuel and make bigger waves.

Ron

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Re: Adding Hydro Foil to Yamaha 8 HP 4 Stroke on 27 Catalina

Any idea what the motor size capacity of a 1977 catalina 27 mounted in the transom storage is?
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Re: Adding Hydro Foil to Yamaha 8 HP 4 Stroke on 27 Catalina

Let's be sure what the problem is. Where is the water level on the outboard when the boat is at rest? Is it where it should be?

What shaft length is this o/b? Normally sailboats use the longest available, extra long, so that there is room for some wave action, squat, etc. It also makes the controls easier to reach.

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Re: Adding Hydro Foil to Yamaha 8 HP 4 Stroke on 27 Catalina

i believe it is a 20-25" shaft

when sitting still it is where it needs to be.
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Re: Adding Hydro Foil to Yamaha 8 HP 4 Stroke on 27 Catalina

In that case it sounds like you need to go slower, yes.

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Re: Adding Hydro Foil to Yamaha 8 HP 4 Stroke on 27 Catalina

The Catalina 27 engine mount for the outboard is on the lowish side, always has been ...


Ron

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