2 persons vs. 8 persons aboard

I just found a picture that shows the engine and the transom.

IMG_1590.JPG

I can't see which screw holes are used from this picture, but I will check it next time I go the marina.

Is this correct or too high?
 
Hello Peter,

I've been following this thread with interest...

I have an L6 200 verado and the ventilation plate is set to about 75 mm above the keel. Much more than a " normal" outboard.

This is partly as the prop on the verado is set back further than traditional outboards. This means the water behind the transom is rising the further it is away meaning the prop won't ventilate.

I have the standard Enertia 15 x15. This replaced a Rev. 4 17".

My boat has 100 hp per tonne. With the 300 on yours it's exactly the same.

With full fuel, low water and 4 adults in choppy sea I can do 35 knots. One up I have achieved 37.6 so not a great reduction with load.

I achieve 6000 WOT with full load...

I have also tried the 13" Enertia but didn't notice much difference.

You do not need a Rev.. 4 prop, the Enertia is a superb prop which grips better than the Rev. 4.

The blade diameter increases as you reduce pitch and the 13" has a diameter of 15.6" so that may be worth a try.

Good luck with sorting out your speed issues..
 
Hot Property said:
Hello Peter,

I've been following this thread with interest...

I have an L6 200 verado and the ventilation plate is set to about 75 mm above the keel. Much more than a " normal" outboard.

This is partly as the prop on the verado is set back further than traditional outboards. This means the water behind the transom is rising the further it is away meaning the prop won't ventilate.

I have the standard Enertia 15 x15. This replaced a Rev. 4 17".

My boat has 100 hp per tonne. With the 300 on yours it's exactly the same.

With full fuel, low water and 4 adults in choppy sea I can do 35 knots. One up I have achieved 37.6 so not a great reduction with load.

I achieve 6000 WOT with full load...

I have also tried the 13" Enertia but didn't notice much difference.

You do not need a Rev.. 4 prop, the Enertia is a superb prop which grips better than the Rev. 4.

The blade diameter increases as you reduce pitch and the 13" has a diameter of 15.6" so that may be worth a try.

Good luck with sorting out your speed issues..
Click to expand...

Thank you very much, HP.

Would you mind share what boat do you have?

From your description, there is a big mistake on my engine mounting height. I will remember the number you said, "75 mm".
 
I just came back from the marina. I have checked the installation of my outboard.

My engine is mounted on the 4th screw hole, that is to say it is mounted at the highest position, can't be higher.

The AC plate is about 1 ~ 1.5 inch higher than the hull bottom.

So, now I can only look at the propeller specification.

I went out for a test run yesterday (not with dealer), wot was 5900 ~ 6000.
Top speed at wot was 29.8 knots (3 adults aboard). I will arrange another test run with
engine dealer in a few days.

Do you guys have any suggestions/advises? Thank you very much.
 
peterjaw said:
I just came back from the marina. I have checked the installation of my outboard.

My engine is mounted on the 4th screw hole, that is to say it is mounted at the highest position, can't be higher.

The AC plate is about 1 ~ 1.5 inch higher than the hull bottom.

So, now I can only look at the propeller specification.

I went out for a test run yesterday (not with dealer), wot was 5900 ~ 6000.
Top speed at wot was 29.8 knots (3 adults aboard). I will arrange another test run with
engine dealer in a few days.

Do you guys have any suggestions/advises? Thank you very much.
Click to expand...

you're not far off 6400 rpm,
You'll need a prop with one or two steps less pitch.
don't focus on max speed, focus on acheeving max rpm, and your boat will behave much better.
don't be seduced to test these polished stainless steel, very expensive third party props, claiming to be so much better,
that is for specialists, looking for the last 0.1Kn.
in your situation, Performance is infuenced much more by other factors sa fouling, and people onboard and where they sit
stick with the orriginal just change pitch
 
Thank you very much, BartW.

I checked and cleaned the fouling before the test run yesterday.
So now I can focus on the prop.
According to your suggestion, I may will test another prop with 1" less pitch and see if I can
achieve 6400 rpm (or close to).

Thank you very much.
 
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