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Old 29 April 2014, 13:43   #1
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Country: UK - England
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Make: Zodiac Cadet340Activ
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Engine: 15hp Mariner
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Planing, high expectations?

Wanting to give the motor a decent blast before using it on the coast, a local boat shop advised me of a discreet inland spot that people use to test their outboards, so I inflated the Acti-v floor to pressure, put it in the water for 10 minutes & re-checked pressure, mounted the 15hp short shaft Mariner correctly and vertically & put the outfit to test on smooth water. Having read through as many previous posts as I could find, my expectation was that I would get 4 of us on board and get on the plane with a little positioning and weight distribution, not a chance, so I tried 3 up, 3 = 1 adult, a 14 year old lad & an 11 year old, est 30 stones total weight, again not having any of it, so I tried just myself and my 14 year old, combined weight of about 24 stones & I think it planed.

So were my expectations unrealistic? Is the combined weight of 2 of us a fair limit for a 340 Acti-v 15hp 2 stroke or should I expect more & perhaps investigate engine issues, correct prop size etc to get more from it?

I would appreciate the experiences of people with a similar outfit.
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Old 29 April 2014, 13:52   #2
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Sounds a little lacking but it's all "the straw that broke the camel's back" with these little SIBs. My 340 with 9.8 will plane with two light adults and two small kids (28 stone) or much more of a struggle with one light and one heavier adult and one kid (32 stone). All this requires shift weight right over bow then back but it's a real effort when weight gets towards 30 stone.

New outfit heavier 3.6m wooden floorSuzumar and Mariner 15 flies up on the plane with one light adult and one small kid. Not tried it with more yet. Your standard manufacturers prop should be ideal. Check engine height/trim is correct and pressures. Buy a cheap tach on eBay (lead around HT plug type) and see what the engine is doing one up.
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Old 29 April 2014, 13:58   #3
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Originally Posted by T4bus View Post
I think it planed.
You'd know for sure if it planed. There is something wrong. 1+1 and it should go like a cut cat.
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Old 29 April 2014, 14:08   #4
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I had a Honwave T32 (V air floor) with a 2 stroke 15hp Mariner that planed easily with 2 adults and 2 kids (Approx 38 stone), max speed 20 kts.

I'm sure there is something wrong, what prop is it ?

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Old 29 April 2014, 14:51   #5
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My 3.4m Zodiac Fastroller with 15hp 2 stroke planed easily with 3 adults aboard. 2 on the seat and me on the tube.
If it's the Mercury outboard, set it to the 2nd trim position.

You'll know when it's on the plane, you're pushing water, the bow comes up, then you get over the hump, the bow drops back down and you're off like a robbers dog.
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Old 29 April 2014, 15:18   #6
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I believe its the original prop, there are some light abrasions on the outside of the blades but nothing that I would think would hinder performance.

I've tried making a rubbing of the number, it looks like -8 x 1/16 ? I've Googled that & nothing came up, I'm guessing from other sizes listed it would likely be 8" pitch? It's a 3 blade white prop & the motor is 1996 (later Mercury power head not the Yam).

When returning home I ran the motor in a bin, I trust revving it hard in the bin is not detrimental to the engine? It was in gear & pumped water freely while under load, I believe it reved much higher than when on the boat & when I let it settle to idle it died & would not subsequently run without plenty of throttle, so I removed, dismantled & cleaned the carb, filter & hoses, all seemed clean already to be fair, just a very feint line around the tapered radius of the needle valve, on re-assembling it the motor it idled fine again so I presumed a little water may have entered the fuel somehow?

I've not had the motor pressure tested but it starts very easily, my 11 year old can start it cold 2nd pull so on that basis I guess the top end is in reasonable shape.

Maybe time to let the local dealer look at my motor though I guess the only true test is on the boat in the water.
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Old 29 April 2014, 15:23   #7
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Originally Posted by stray View Post
My 3.4m Zodiac Fastroller with 15hp 2 stroke planed easily with 3 adults aboard. 2 on the seat and me on the tube.
If it's the Mercury outboard, set it to the 2nd trim position.

You'll know when it's on the plane, you're pushing water, the bow comes up, then you get over the hump, the bow drops back down and you're off like a robbers dog.
Mmmm? I tried the 2nd trim position & felt like it was trying to bury the outboard into the water so I gave up with that straight away, I had it set so the prop is as close to the transom as possible, maybe I should give the 2nd position another try.
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Old 29 April 2014, 16:03   #8
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T4Bus have a look at this Youtube of our Zodiac 360 Fastroller (with Acti-V floor).

It is carrying a load of approx 32 stone in one adult, two girls, extensive bag of kit/anchor etc and fuel. You will see the Mariner 15 2-stroke easily pops it on the plane in about 4 seconds from opening the throttle. It didn't make a big difference whichever trim posn you were in.

There is something odd about the poor performance you're seeing with yours.

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Old 29 April 2014, 16:12   #9
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Quote:
Originally Posted by T4bus View Post
I believe its the original prop, there are some light abrasions on the outside of the blades but nothing that I would think would hinder performance.

I've tried making a rubbing of the number, it looks like -8 x 1/16 ? I've Googled that & nothing came up, I'm guessing from other sizes listed it would likely be 8" pitch? It's a 3 blade white prop & the motor is 1996 (later Mercury power head not the Yam).

When returning home I ran the motor in a bin, I trust revving it hard in the bin is not detrimental to the engine? It was in gear & pumped water freely while under load, I believe it reved much higher than when on the boat & when I let it settle to idle it died & would not subsequently run without plenty of throttle, so I removed, dismantled & cleaned the carb, filter & hoses, all seemed clean already to be fair, just a very feint line around the tapered radius of the needle valve, on re-assembling it the motor it idled fine again so I presumed a little water may have entered the fuel somehow?

I've not had the motor pressure tested but it starts very easily, my 11 year old can start it cold 2nd pull so on that basis I guess the top end is in reasonable shape.

Maybe time to let the local dealer look at my motor though I guess the only true test is on the boat in the water.
I wouldn't rev it too hard in the bin, it can exceed recommended RPM as it is not pushing anything (not under load).
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Old 29 April 2014, 16:19   #10
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Prop - 1st number is the diameter, 2nd number is the pitch. I think the standard prop on yours is a 8" X 9". If its significantly different (either up or down) it can easily bugger up the performance.

Next question, are you sure its a 15hp ? The 8hp was the same shape and block.(Really not trying to be insulting, just thinking of all possible problems)
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