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Old 10 September 2007, 12:37   #1
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Getting on the plane / trim

As one new to RIBs, but generally experienced in small craft, I have a problem getting my Avon 400 onto the plane, and balancing at moderate speed (8-12knots).

Low speeds upto 7 knots are fine, but I'm haviong difficulty in getting balanced between this speed & a full plane at 12 knots plus. It also seems to take quite a while to get up onto the plane.

Is this my poor handling of ther power trim, or is there some technique I should be following?

The RIB is powered ny a Mercury 40HP with power trim, but no instrumentation showing revs, or trim angle.

Hoe do I judge the best trim angle for the outboard.

Would appreciate any advice.
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Old 10 September 2007, 13:57   #2
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Do you have a flooding hull on your boat?
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Old 10 September 2007, 14:21   #3
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HI - I have same boat ( not flooding hull) & its very dependant on weight in the bow for me . I have a 50 hp and weight to the rear so fitted some fins to outboard to help transition as scared myself to start with !

Generally start with trim all the way in until full planing speed ( with the fins @10knts ish) & then out till it feels 'ok' .

I generally ignore trim gauge once running & just go by feel. Have a play on flat water & see what happens - its deceptive how for down the OB will go .

Do you blunder along bow high not really going quiker - if so put a person in the bow for a few secs & then move them back .
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Old 11 September 2007, 04:37   #4
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Thanks for the advice Blackroady.

With my layout I've of much of the weight aft.

I'll have a further play at the weekend.

I do find getting the correct trim on the OB tricky. Is it just trial, error feel & experience?
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Old 11 September 2007, 05:52   #5
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I have fins on my 50Hp outboard on my YAM480R - I tend to leave engine trim until I am up to speed then trim it out to match revs - I must admit though the best way is by feel of the boat and the spray!! I have afew times got the nose right up in the air with sooo much weight back - but expereince has stopped that now. As suggested find a calm day and an open stretch of water and play (where are your fuel tanks in the rib? Mine are in the rear locker so I need to adjust trim as they go down as well.)
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Old 11 September 2007, 06:17   #6
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Don't know if this helps but I took my searider out for the first time last week. I havn't found a outboard for it yet so used my 5hp tohatsu. I was very suprised to see that this outboard got it on the plane with 2 people !! This was on very flat water about 15mph on gps.

My searider is likely to be very light compared to yours (see pic). But I found it planed alot easier with one person up front.

I think that weight up front will make a big improvement. Also the flooding hull (if yours has one) takes some getting used to.
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Old 11 September 2007, 06:36   #7
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Don't know if this helps but I took my searider out for the first time last week. I havn't found a outboard for it yet so used my 5hp tohatsu. I was very suprised to see that this outboard got it on the plane with 2 people !! This was on very flat water about 15mph on gps.

My searider is likely to be very light compared to yours (see pic). But I found it planed alot easier with one person up front.

I think that weight up front will make a big improvement. Also the flooding hull (if yours has one) takes some getting used to.
Is that your car you are launching with?
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Old 11 September 2007, 06:40   #8
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Yea, The photo was actually taken when I was recovering. We just walked it down the slipway to launch it.
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Old 11 September 2007, 06:47   #9
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Hope you washed it off well, if not try & use someone else's car next time!
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Old 11 September 2007, 06:51   #10
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Hope you washed it off well, if not try & use someone else's car next time!
Don't worry its fresh water
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