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Old 12-04-2007, 13:53   #1
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It comes in threes -I hope!!

Oh boy what a bad week. I let some of my students take my inflatable with 15Hp outboard on it for a splat around the bay. The outboard died. So I exhausted all my knowledge on it and then took it to an outboard specialist. Told them not to go spending too much on it without telling me first. I dunno, maybe in the outboard world, $229.00 dollars isn't considered too much. But that's what they spent. It turns out the outboard had been over reved and the intake reeds were broken. So seeing as I don't have $229. right at the mo, it's going to have to stay in their workshop till I can afford it.
What a week.
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Old 12-04-2007, 14:46   #2
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Man... what a week. Sorry to hear that. Now did the student at least offer to pitch in on the repair costs, or is he unaware that he may have damaged it?

Also, isn't the outboard set for a top RPM limit to avoid damage?

I run my 5HP outboard WFO (W.ide F...... O.pen) all the time.
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Old 12-04-2007, 15:15   #3
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The students I work with couldn't afford to buy shoe laces.
The problem is if they turn too sharp, the ouboard will cavitate and over rev. This apparently shatters the reed. I am n ot sure if it wil work, but I thought I might put one of those plates on top of the skeg and ee if that reduces the cavitation. I guess the problem is that the inflatable has an inflatable keel and this must cause waterflow issues when in some situations.
Actually, I hope this doesn't sound like I am wining or winging. It's just been one of those weeks. Ya have to laugh. If you don't, you go nuts.
Hey, they tell me worse things can happen at sea. Hang about, we go to sea :-(
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Old 12-04-2007, 15:59   #4
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I don't see it as whining at all. That really is a rough boating week.

I see what you mean about the cavitation allowing the outboard to possibly hit higher RPMs. I hadn't thought of that since I wasn't picturing running WFO through turns. !!

Hopefully, you'll find good (and more reasonably priced) solutions to these last couple surprise boat projects. Best of luck to you!
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Old 15-06-2007, 22:15   #5
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good and bad

If it makes you feel any better we are hemoraging money at the moment over our boat. Boat yards suck! Can't wait to splash!
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Old 15-06-2007, 22:27   #6
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Wheels you know how it is..........dingy ...engine...kids......You tell yourself "just what harm could they possibly do?" And you get the anwser !! I hung my dingy, with engine with less than one hour on it, straight down from the stern of my boat by its painter. (It wasnt an inflatable). Seems that once you go over a certain speed ,the transom of the dingy, with engine with less than one hour on it, takes on water. Enjoying a spirited sail and not bothering to look back at now towed submarine dingy with engine with less than one hour on it, is a bad idea. Its not that Im bitter.....its just that I have trouble going to sleep some nights as a reoccuring vision flashes through my mind Somthing to do with a brand new engine.............l share your pain......!!
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Old 15-06-2007, 23:39   #7
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Just can't understand it. I know I never did anything to hurt my dad's car when I was a kid
It really has been one of those weeks. Just starting the big bleed on the tri. Until recently, there has been no real deadline. :sigh: Well, never wanted to be rich anyway.
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Old 16-06-2007, 09:41   #8
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Ahh Kai - Bleeding Green on a boat - again ... 6 times removed? You should be accustomed to it by now. Now .. if you would just get yourself down to one boat and one house, you would be in the black! Aren't I helpful!! O
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Old 17-06-2007, 00:54   #9
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Wheels,

I have an inflatable with a 6HP outboard, and adding the Davis "Doel-Fin" plates really helped reduce cavitation. I can accelerate better, and the "squat" seems to have been reduced as well. Without the plates, I had to be quite gentle with the throttle -- not so great when I was trying to outrun the shorebreak! I can still make it cavitate now, but I have to really try,

I was also reading somewhere about putting on a deeper pitch prop to better match the speed characteristics of the (slow) dinghy. I may try that one of these days.
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Old 17-06-2007, 02:48   #10
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Thanks for that advice Paul. I had been wondering about a cavitation plate. I will try that.
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Old 18-06-2007, 10:44   #11
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Alan,
I was skeptical about a Doelfin until I finally tried one.
Now it's always the first thing I add to any outboard motor.
I feel naked without one.

Steve B.
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Old 18-06-2007, 12:25   #12
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I'll echo the sentiments for the Doelfin (or Stinger, or SST, or any of the other, similar cavitation plate fins). They made a huge difference in comfort and amount of throttle needed to stay on plane with our 9-foot Caribe RIB with a 15 hp Yammy 2-stroke (now THAT was a fun little ride!) They really keep the nose down and help her to jump up on plane. We also have them on our 13-foot Carolina skiff with a 25 hp Johnson, and they made a huge difference there, as well.
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