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Old 08 July 2008, 16:42   #1
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Country: USA
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Make: Avon
Length: 3m +
Engine: Yamaha 15 hp 2 strok
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Avon 10' Planing

I am having difficulty getting my 10' Avon to plane with 2 adults and 12 year old child on board. I am using a 15 hp Yamaha 2 stroke for power. I have already installed the dolphin on the engine and it works great at keeping the bow down with one person on board but does not seem to do much with 2 or more people.

I am thinking that perhaps I need to change out the prop and am looking for some advice. I am not sure what is on the engine now but believe it has the standard prop shipped from the factory as I bought the set up second hand.

Any advice or guidance would be appreciated.

Thanks
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Old 08 July 2008, 17:47   #2
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Country: UK - Wales
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My 10' Quicksilver will plane with 3 adults and 2 small kids onboard - using a 15hp suzuki 4 stroke.

The trick is to get someone to lean right over the bow until you are on the plane and then move back.

The fin could be increasing your drag which you don't want with marginal power!!!
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Old 09 July 2008, 09:11   #3
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Quote:
Originally Posted by chuck713 View Post
I am having difficulty getting my 10' Avon to plane with 2 adults and 12 year old child on board. I am using a 15 hp Yamaha 2 stroke for power. I have already installed the dolphin on the engine and it works great at keeping the bow down with one person on board but does not seem to do much with 2 or more people.

I am thinking that perhaps I need to change out the prop and am looking for some advice. I am not sure what is on the engine now but believe it has the standard prop shipped from the factory as I bought the set up second hand.

Any advice or guidance would be appreciated.

Thanks
Something definitely doesn't sound right here. With the load you describe it should plane with an 8hp let alone a 15hp!

Unless you have a 'massive' prop on there it should fly up on to the plane - You sure it's firing on both cylinders?

Is it an airdeck of wooden floor? - if airdeck, is it(and the keel) correctly inflated?

Have you ever managed to get it to plane with the decribed load in the past or is this the first attempt?

How old is the engine? - has it seen better days?

I have a 10' Avon with a '88 Johnson 15hp that will get up on the plane with 4 large chaps on board!!
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Old 09 July 2008, 19:00   #4
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you need to shift the crew about a bit to trim the boat as codprawn said you need loads of wieght at the front whilst trying to get on the plane , when its on the plane shift them about until its riding right.you will probley need to steer at near arms length and have the rest of the crew up front as far as they can go including the fuel tank , regards the dolphin installed on your engine ,i fitted some doel fins to a small 11 ft sib few weeks ago and it reduced my speed down a couple of knots , silly queston but is the boat a r.i.b or a s.i.b if so is it inflated to the right pressure with a small boat it can make a big difference, i have an avon 11 ft sib and with a 8 hp 4stroke it with easly plane with 2 adults and my 8 year old son on board as long as were all well forward . could be the prop , though with factory standard props if it is one it should be giving you better performance than what your getting as they are usually middle of the range pitch .any numbers on the prop at all .
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