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Old 02 December 2009, 07:58   #11
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atm,your so rude and twins on a dingy,come on please
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Old 02 December 2009, 11:27   #12
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I have checked my boat is a RIB it has a fiberglass v shaped hull and inflatable tubes. so not a sib i think.

My mate has a bigger propeller he is going to lend me, he is also trying to sell me a console I am worried this extra weight will make the problem worse not better.

Thanks for all your advice so far- theres more to this boating lark than i thought.

I will head down to the shed where she is stored and get a couple of pictures and post here. maybe tommorow if the rain stays off
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Old 02 December 2009, 11:43   #13
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I have checked my boat is a RIB it has a fiberglass v shaped hull and inflatable tubes. so not a sib i think.
that means she'll be relatively heavy so struggle more. generally speaking the deeper the v the harder to get it to plane also.

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My mate has a bigger propeller he is going to lend me,
bigger isn't always better - if you can't get over the 'hump' then I think you need more acceleration (smaller pitch prop) not bigger. If you get on the plane but not fast enough bigger might help, if you have enough power to turn it.
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he is also trying to sell me a console I am worried this extra weight will make the problem worse not better.
extra weight is not going to help - but it will be weight further forward which is a start.
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Old 02 December 2009, 15:54   #14
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So what kind of console are you thinking of putting on it. I presume it is a fairly small on as im guessing there wont be an awfull lot of room.
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Old 02 December 2009, 19:15   #15
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Sell your 2 6hp engines and buy one 15hp.
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Old 03 December 2009, 04:00   #16
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Sell your 2 6hp engines and buy one 15hp.
That's what i'd do,



Got a 2stroke Yammie on a 3.1m Avon and she has nnnoooo problems getting on the plane / airborne
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Old 03 December 2009, 04:18   #17
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If it's a solid floor then yes, it will be a touch heavvier, but I spent a summer at an outdoor centre with two 3m Avon solid floor things similar to what you have. 8Hp on the back of both and there was an interesting comparison - one had a Yam, the other had an older Mariner.

The mariner would get on the plane instantly, but the absolute top speed wasn't as fast as the yam, which needed a move forward (as mentioned before) to get over it's own bow wave, but once on the plane left the Mariner standing.

The Yam had a higher pitched prop.



As said, a console will add weight, but will shift the weight forward. A relatively cheap option might be to try a tiller extension, but that's not going to work safely with twins. When you get to the boat, have a look & see if there is a "max rating" on the transom.

I just pulled a manual from the Bombadier website- those 6 Hp 4- strokes weigh in at 30 odd Kg. to put that in perspective, the 4-Stroke 15 Hp weighs in at 44Kg. Save 20 Kg, gain 3 Hp & half your drag......

Having said that, it's probably worth playing with the propellors first. As a first check - when you're there taking photos, somewhere on the hub will be a number. Can you post them both- you may have two differnet props fighting each other as well.....
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Old 03 December 2009, 05:16   #18
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then there may be options to consider like dolefins
I was thinking the same, I have never had a set and I cannot comment on the performance change but, from the adverts they should make quite a difference.

Does anyone have experience of these?

Lee
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Old 03 December 2009, 05:37   #19
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Only thing with doelfins on this setup is that the engine is likely not bolted to the transom - will the clamps be enough to handle the extra lift? - Remember that they effectivley lift the back of the boat by the engine, and if it's loaded with fishing gear.....


I'd try (in this order)

- Move the kit forward, and try leaping forward at the right moment to get on the plane.
- Try a lower pitch prop
- Try a single bigger engine - (Even consider a 2-stroke which will be lighter).


The other thig that just crossed my mind - are they long or short shaft engines?
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Old 03 December 2009, 05:56   #20
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Doelfins make a bit of difference but not loads.
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