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Old 13 August 2005, 07:35   #21
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If you trimmed the engine up a bit, you may get some more knots.
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Old 13 August 2005, 08:04   #22
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I dont think they are actually doing 42.2 knots when the photo was taken - if so then its bloody impressive at 2000 rpm - not to mention very steady camera work

I assume that 42.2 was max speed and 6.2 was the current speed.
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Old 13 August 2005, 08:10   #23
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Thanks robin - are those trim tab switches in the centre of your console.

did you have those fitteb when the boat was built or did you get them rero fitted.

dod you use them much - what difference do they make - do you recomend them...
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Old 13 August 2005, 11:25   #24
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Quote:
Originally Posted by gingercoastie
If you trimmed the engine up a bit, you may get some more knots.
If that was for me Alex....
Yup...did that

The 42.2 knots is the max speed attained on the run.
Having come down to a more stable speed to take the picture (6 knots as per the current speed indicator) the leg was trimmed back in again otherwise we would have been going uphill.
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Old 13 August 2005, 11:41   #25
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Quote:
Originally Posted by roycruse
Thanks robin - are those trim tab switches in the centre of your console.

did you have those fitteb when the boat was built or did you get them rero fitted.

dod you use them much - what difference do they make - do you recomend them...
Left hand switch is nav lights, right hand switch is bilge pump.

No trim tabs.

Personally I wouldn't bother with trim tabs on a boat this size.
You are able to deal with fore/aft trim issues using the outboard leg. Any lateral balance issues can be dealt with by judicious distribution of weight (move the lardies about).
That really doesn't leave the trim tabs much else to do except on a larger craft (leaning into the wind issues) ....or....to assist with planing on a poorly balanced or wrongly set up boat.
Keep it simple.
All in my humble opinion of course
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Old 13 August 2005, 11:46   #26
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Quote:
Originally Posted by roycruse
I dont think they are actually doing 42.2 knots when the photo was taken - if so then its bloody impressive at 2000 rpm - not to mention very steady camera work

I assume that 42.2 was max speed and 6.2 was the current speed.
Spot on.

At 42.2 knots I had one hand on the throttle and the other on the wheel.

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Old 14 August 2005, 03:53   #27
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Now my Ribtec 5.35 with a 90 hp will touch 40kts ( 38, 4 up)
What am I doing wrong? My Zodiac 550 with Suzuki df115 will only reach 34kts HELP!
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Old 14 August 2005, 08:38   #28
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What am I doing wrong? My Zodiac 550 with Suzuki df115 will only reach 34kts HELP!
I presume you have the leg trimmed right out at the time in calm conditions.

What prop are you using?
What RPM are you doing at 34 knots?
How much fuel / passengers are you carrying?
How are you measuring 34 knots - paddle wheel speedo or gps?

I would have thought you should be going quicker than that - my humber with its DT55 could manage 33 knots but it was a much smaller boat,
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Old 14 August 2005, 08:53   #29
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My Zodiac 550 with Suzuki df115 will only reach 34kts HELP!
Yes agree with Roy, think you should be going a bit quicker than that, he's asked all the relevant questions, lets see how much of your money we can spend!
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Old 15 August 2005, 07:14   #30
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Quote:
Originally Posted by roycruse
I presume you have the leg trimmed right out at the time in calm conditions.

What prop are you using?
What RPM are you doing at 34 knots?
How much fuel / passengers are you carrying?
How are you measuring 34 knots - paddle wheel speedo or gps?
Have not had the leg trimmed right out
Standard prop that came with the motor
about 5500 rpm
full tank 80lt/2 passengers
gps

I am just going out now for a couple of hours will try with the leg trimmed right out & see what it will do.
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