Mercury V12 600hp Verado Outboard Engine

[cstewart37]

Obviously I meant without carrying additional fuel with you.

We need the cans ( fit in the locker under deck ) as if we go to Ireland or IOM we take a taxi to the local petrol station. On the Clyde its easy to get petrol in the marinas Holly Loch, Largs & Portavadie

 

[Hot Property]

I run a Parker 750cc c/w Verado 300hp at 27 to 30kn we burn 50lph. Would never go back to a diesel sterndrive had 4 of them all money pits. We top out at 42kn but the fuel burn is 110lph.

That looks like a Rev 4 prop, as Qbhoy mentioned, the Enertia 3 blade props are brilliant. Same grip as a 4 blade with the efficiently a 3 blade.

Quite rare and not cheap, but if you have the chance to try one I think you will be impressed..

I run a 13" one with my 200 L6 Verado.

 

[QBhoy]

That looks like a Rev 4 prop, as Qbhoy mentioned, the Enertia 3 blade props are brilliant. Same grip as a 4 blade with the efficiently a 3 blade.

Quite rare and not cheap, but if you have the chance to try one I think you will be impressed..

I run a 13" one with my 200 L6 Verado.

Amazing things eh. Best props I’ve ever had on a boat. But defo not cheap and almost impossible to find a used one in the U.K.

 

[Hot Property]

Amazing things eh. Best props I’ve ever had on a boat. But defo not cheap and almost impossible to find a used one in the U.K.

You don't have an 11" one knocking about do you Qbhoy? Need to get my revs up as only 6,000 when WOT range is 5,800 to 6,400.....

 

[ontheplane]

What speed you pulling?

11" seems a very shallow pitch - but then I dont know know power to weight and gear ratios I guess

 

[Hot Property]

What speed you pulling?

11" seems a very shallow pitch - but then I dont know know power to weight and gear ratios I guess

Ratio is 1.85:1

13" pitch gives around 34 knots at 6,000 rpm. Boat probably 2.2 tons overall.

 

[QBhoy]

Ratio is 1.85:1

13" pitch gives around 34 knots at 6,000 rpm. Boat probably 2.2 tons overall.

I don’t have anything close to that even HP. Sounds an odd one that. I’d have naturally thought you’d be a little more pitch than that. Is that the max rpm when you’re trimmed up and all else well ?
I had issues with my prop bore sleeve ring on my CT gearbox (big gearbox). Wee plastic throng that comes loose and can end up throwing exhaust over the prop and losing speed and rpm occasionaly. The power trim shuttle valves are also a warranty claim issue on most big engines around 2016 or a few years each side of that. That means the valves pass and won’t allow trim beyond a certain height, when under load like full throttle.
All that being well and good, sounds a bit odd perhaps. Have you ran the numbers through a prop slip calculator Hot Property ?

 

[QBhoy]

Ratio is 1.85:1

13" pitch gives around 34 knots at 6,000 rpm. Boat probably 2.2 tons overall.

Was bored there HP and ran your numbers. Something I think isn’t making sense, I’m sure. Those numbers show only a 2% prop slip. To put into perspective. 0% is an impossible number and a prop slip of 3/4% is serious padded hulls and totally air bourne stuff. Most decent hulls in general would see a slip of around 7-15% I’d think, on average. 7% being very good and 15% on the verge of needing props messed with to tweak a little more out her. So you being at 2...although not impossible...I’d think very unlikely. Wonder if the gear ratio is different from what’s assumed ? Or is the speed in mph and not knots ? Be great to get you propped really well. Makes a huge difference to a boat, as you’ll know.

 

[MapisM]

I agree with your calculation, but don't take nominal prop pitch too seriously.
If the prop that HP is using would actually be just 1" longer than the nominal 13" (which is known to happen with many props, either side of the nominal pitch), the slip would become a much more believable 9%.
Btw, that's one common problem when changing a too long or too short prop: if in the process also the type of prop is changed, chances are that the result will be different from what could be expected by the pitch change alone.
In HP boots, if the engine is rated for achieving a WOT rpm in the 5800 to 6400 range, and he's reaching 6000, I wouldn't mess with anything.

 

[Hot Property]

Was bored there HP and ran your numbers. Something I think isn’t making sense, I’m sure. Those numbers show only a 2% prop slip. To put into perspective. 0% is an impossible number and a prop slip of 3/4% is serious padded hulls and totally air bourne stuff. Most decent hulls in general would see a slip of around 7-15% I’d think, on average. 7% being very good and 15% on the verge of needing props messed with to tweak a little more out her. So you being at 2...although not impossible...I’d think very unlikely. Wonder if the gear ratio is different from what’s assumed ? Or is the speed in mph and not knots ? Be great to get you propped really well. Makes a huge difference to a boat, as you’ll know.

Yes tests done up Southampton water in flat calm slack tide and no wind which meant I could trim out to the ventilation point.

2 way runs then averaged. I'll dig out my calc sheet to confirm the figures though. I applied Silic one to the hull afterwards and can't remember the top speed....

Thinking about it more, the hull wasn't that clean so maybe more like 30 knots, I convert to mph for the Mercury prop slip calculator.

AV plate is just a tad above keel line, any more and I'll suffer ventilation in turns.

I'm not a performance addict but I do enjoy the challenge of improving mpg, speed etc by tweaking things. Unsurprisingly, I have a few props I need to dispose of!!

 

[Hot Property]

These figures are for the 13" Enertia prop. As I thought, speed was down so slip is up..

	Trim setting		Knots	Average MPH	Revs	Smartcraft Fuel consumption litres/hr IN	Smartcraft Fuel consumption litres/hr OUT	Average fuel consumption litres/hr	Actual Fuel is less 3% based on full to full vs smartcraft figure	Slip %	Statute MPG
Minimum planing speed	0			17.8	3500	26.6	27	26.8	26.0	24	3.0
	0		18.8	21.6	3750	31.6	32	31.8	30.8	13	3.1	efficient Cruise speed
	0		20.1	23.2	4000	36	35.8	35.9	34.8	13	2.9
	0		21.1	24.3	4250	40	40.3	40.15	38.9	14	2.8
	0		22.7	26.2	4500	46.7	46.5	46.6	45.2	13	2.6
	0		24.4	28.1	4750	50.3	50.5	50.4	48.9	11	2.5
	0		26.0	29.9	5000	61.8	61	61.4	59.6	10	2.2
	0		27.3	31.4	5250	71	71	71	68.9	10	2.0
	0		28.4	32.7	5500	81	83	82	79.5	11	1.8
Max revs and trimmed out	max		29.97	34.5	5880	88	88	88	85.4	12	1.8

 

[QBhoy]

These figures are for the 13" Enertia prop. As I thought, speed was down so slip is up..

	Trim setting		Knots	Average MPH	Revs	Smartcraft Fuel consumption litres/hr IN	Smartcraft Fuel consumption litres/hr OUT	Average fuel consumption litres/hr	Actual Fuel is less 3% based on full to full vs smartcraft figure	Slip %	Statute MPG
Minimum planing speed	0			17.8	3500	26.6	27	26.8	26.0	24	3.0
	0		18.8	21.6	3750	31.6	32	31.8	30.8	13	3.1	efficient Cruise speed
	0		20.1	23.2	4000	36	35.8	35.9	34.8	13	2.9
	0		21.1	24.3	4250	40	40.3	40.15	38.9	14	2.8
	0		22.7	26.2	4500	46.7	46.5	46.6	45.2	13	2.6
	0		24.4	28.1	4750	50.3	50.5	50.4	48.9	11	2.5
	0		26.0	29.9	5000	61.8	61	61.4	59.6	10	2.2
	0		27.3	31.4	5250	71	71	71	68.9	10	2.0
	0		28.4	32.7	5500	81	83	82	79.5	11	1.8
Max revs and trimmed out	max		29.97	34.5	5880	88	88	88	85.4	12	1.8

And that’s smart craft rpm readings HP ? Is this an enertia eco or the normal fast one HP ?

 

[Hot Property]

And that’s smart craft rpm readings HP ? Is this an enertia eco or the normal fast one HP ?

Smartcraft and the normal Enertia not ECO....

15" Enertia stats... I'll do some more tests after annual maintenance. The Silic One I applied gives about another 1.5 knots on top speed plus no fouling during the season either.

	Prop	Enertia 15"		50% fuel, no water, 1 person			No wind, flat water approx 1 knot tide
	Knots	MPH In	MPH Out	Average MPH	Revs	Average fuel litres.hr	Actual Fuel is less 3% based on full to full vs smartcraft figure	Slip %	Statute MPG based on corrected fuel flow
Minimum planing speed	16.38	19.7	18	18.9	3500	26.2	25.4	30	3.4	Efficient cruise
	18.81	21.9	21.4	21.7	3750	31.3	30.3	25	3.2	OK
	20.98	24.6	23.7	24.2	4000	36.3	35.2	21	3.1	OK
	22.81	26.6	25.9	26.3	4250	42.5	41.2	20	2.9
	24.33	28.2	27.8	28.0	4500	47.9	46.4	19	2.7
	26.37	30.5	30.2	30.4	4750	55.5	53.8	17	2.6
	27.63	32.1	31.5	31.8	5000	67.0	65.0	17	2.2
	29.37	34.2	33.4	33.8	5250	78.5	76.1	16	2.0
Max revs & trim fully out	30.89	36.8	34.3	35.6	5350	85.0	82.5	13	2.0

 

[QBhoy]

Smartcraft and the normal Enertia not ECO....

15" Enertia stats... I'll do some more tests after annual maintenance. The Silic One I applied gives about another 1.5 knots on top speed plus no fouling during the season either.

	Prop	Enertia 15"		50% fuel, no water, 1 person			No wind, flat water approx 1 knot tide
	Knots	MPH In	MPH Out	Average MPH	Revs	Average fuel litres.hr	Actual Fuel is less 3% based on full to full vs smartcraft figure	Slip %	Statute MPG based on corrected fuel flow
Minimum planing speed	16.38	19.7	18	18.9	3500	26.2	25.4	30	3.4	Efficient cruise
	18.81	21.9	21.4	21.7	3750	31.3	30.3	25	3.2	OK
	20.98	24.6	23.7	24.2	4000	36.3	35.2	21	3.1	OK
	22.81	26.6	25.9	26.3	4250	42.5	41.2	20	2.9
	24.33	28.2	27.8	28.0	4500	47.9	46.4	19	2.7
	26.37	30.5	30.2	30.4	4750	55.5	53.8	17	2.6
	27.63	32.1	31.5	31.8	5000	67.0	65.0	17	2.2
	29.37	34.2	33.4	33.8	5250	78.5	76.1	16	2.0
Max revs & trim fully out	30.89	36.8	34.3	35.6	5350	85.0	82.5	13	2.0

Hi HP. Likely not an issue on yours...but you have any issues with trimming up under load ? There was a warranty recall for trim shuttle valves on some engines like mine. Mine is a 2016. It will trim up to a certain height and then not hold and drop down an increment or two. The valves pass. I’ve got a new set sent out to replace them. Annoyed the life out me. Could never get the bow too much out the water.

 

[Hot Property]

Hi HP. Likely not an issue on yours...but you have any issues with trimming up under load ? There was a warranty recall for trim shuttle valves on some engines like mine. Mine is a 2016. It will trim up to a certain height and then not hold and drop down an increment or two. The valves pass. I’ve got a new set sent out to replace them. Annoyed the life out me. Could never get the bow too much out the water.

Not a problem as far as I can tell. I can trim out to ventilation point......

 

[QBhoy]

Not a problem as far as I can tell. I can trim out to ventilation point......

Perfect. Yours sounds ok then. Do you set your “0” trim indication on the gauge when it’s right down HP or is “0” set at level trim ? Mine is set to when it’s right down. Often wondered if I set it to “0” when it’s level...would it show a negative number when right down ? Must have a play with it.
Im fitting hydraulic steering next week and lifting the engine up a bolt hole soon after. A little low as she is now. She is sitting level with the line of the hull or even maybe a little lower, in relation to the AV plate. Should see a little more top end hopefully. Between the trim fix and that. Does so well to see 45 gps as she is with the enertia 20”. And 42/43 gps with the 19” tempest. This is the outboard fletcher, referring to here. Only a 115 CT, but so impressive for what it is. Love the fuel economy too.

 

[Hot Property]

Perfect. Yours sounds ok then. Do you set your “0” trim indication on the gauge when it’s right down HP or is “0” set at level trim ? Mine is set to when it’s right down. Often wondered if I set it to “0” when it’s level...would it show a negative number when right down ? Must have a play with it.
Im fitting hydraulic steering next week and lifting the engine up a bolt hole soon after. A little low as she is now. She is sitting level with the line of the hull or even maybe a little lower, in relation to the AV plate. Should see a little more top end hopefully. Between the trim fix and that. Does so well to see 45 gps as she is with the enertia 20”. And 42/43 gps with the 19” tempest. This is the outboard fletcher, referring to here. Only a 115 CT, but so impressive for what it is. Love the fuel economy too.

I set up the trim to show 0 when the AV plate is in line with the hull. Trimming further in doesn't give a negative number....

 

[QBhoy]

I set up the trim to show 0 when the AV plate is in line with the hull. Trimming further in doesn't give a negative number....

Well that’s that question answered, haha. Thanks for that. I should do the same really. Not sure why I set it at 0 when trimmed right in.
The trim tilt on mine has had a limit set on it when way up in trailer mode too. To stop the engine hitting the boat. Might be able to adjust that a little, once engine has been lifted. As it is, the trailer swing arm catch lever won’t engage.

 

[BruceK]

Go Formula. @seastoke Hey Roy, next boat for sure. Still want to race?

 

[ontheplane]

Thought that was going to be a pointless horrible centre console - but actually a nice boat!

I don’t know if it was my imagination or did they seem quite loud? I suppose 2400hp is always going to make a fair bit of noise, but they didn’t seem as quiet as I expected.....

Didn’t mention the fuel burn mind lol.