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Old 30 October 2012, 14:46   #1
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1st few trips - is the performance ok?

First chance to put the boat on the water this half term.....

Brig F400S with an etec 40

The plotter was showing 25 Mph at approx 5500 revs - does this seem 'about right'?
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Old 30 October 2012, 15:47   #2
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Was the plotter set for Miles or Knots?

Overall, you're in the ballpark though. Did you experiment with engine trim and overall loads (weights)? On a boat this size, extra fuel and passengers and "stuff" make a big difference.
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Old 30 October 2012, 16:16   #3
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Was the plotter set for Miles or Knots?

Overall, you're in the ballpark though. Did you experiment with engine trim and overall loads (weights)? On a boat this size, extra fuel and passengers and "stuff" make a big difference.
Set to mph, me plus 3 kids, engine trimmed up slightly, boat straight onto the plane and running very smoothly!

What should I expect for 'maximum' speed?
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Old 30 October 2012, 16:32   #4
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Interested in what sort of fuel consumption I should expect, running at average 10 to 15 mph - thanks
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Old 30 October 2012, 16:36   #5
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I don't know how much experience you have, so please excuse the question - did you trim the engine up while running on the plane?

Max speed will only be discovered if you gradually trim up while underway to discover that sweet spot where you get max revs but before the prop starts to ventilate (engine revs wildly). Ditch the sprogs, tidy out the lockers and try it on calm water with a 1/2 tank of gas - that's your top speed with that rig
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Old 30 October 2012, 16:38   #6
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Interested in what sort of fuel consumption I should expect, running at average 10 to 15 mph - thanks
Very little

That Etec is maybe most efficient around 3000rpm (anyone?)
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Old 30 October 2012, 16:39   #7
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That's the plan for the spring - are you offering your babysitting services? Thanks
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Old 30 October 2012, 16:53   #8
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What should I expect for 'maximum' speed?
A little but not much more than that. Probably lucky to break 30mph.

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Interested in what sort of fuel consumption I should expect, running at average 10 to 15 mph - thanks
that might not be your best fuel economy. I think you'll probably manage close to 2 miles per litre at cruising speed on a rig that size, but you need to test it to see before relying on that.
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Old 30 October 2012, 17:06   #9
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That Etec is maybe most efficient around 3000rpm (anyone?)
Probably more towards 3500 rpm where you would expect a fuel burn of about 1.5 gal/hr
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Old 31 October 2012, 12:24   #10
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At that sort of speed with my aged 60Hp I drink 0.83L/ Nautical mile = approx 0.96L/statute mile. You should get sligtly better than that with a smaller, lighter boat with a more modern engine.

For cruise planning, 1L/ Nautical mile is a good going in point. (1.2L/statute mile if you prefer working in land units)

As said before, play with the engine trim & weight distribution - you will be amazed at the differnece it makes. (if you got Power trim you will hear the engine change note & at some point it will "sing" as you trim out)
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