gph for 1050 hp

[cataldo]

Hi

Roughly how many gallons per hour
for these type boats,in the cruise,

Cheers

Cathal

 

[capsco]

45-50 gallons per hour at WOT

 

[cataldo]

gph for 1050hp

Thanks

But in the cruise,our last boat
princess 440 tamd 73p edc
had 40 gph flat out
and think under 30
in the cruise.

That seems very reasonable
for that push..

Thank,
Cathal

 

[Canopy Locked]

I think that the rough "rule of thumb" is 1 L / 10hp / Hr

so 1050 hp = is 105l l/hr or around 23 GPH

Certainly my boat, at a cruise setting, does 22L/Hr (225 hp)

Guess it does depend on engine age/ condition, boat etc....

 

[MapisM]

so 1050 hp = is 105l l/hr or around 23 GPH

Naah... You must more than double that figure, i.e. 50 GPH or so, to get closer to the mark.
Show me a diesel engine rated for 1050 hp which burns 23 GPH at full load, and I'll eat my humble pie on the spot.

 

[Divemaster1]

Naah... You must more than double that figure, i.e. 50 GPH or so, to get closer to the mark.......

I'd have to agree... I'd hazard to guess it will be more like 200 -240 L/Hr at full load for 1050 Hp.. (using approx 200 grammes per HP/Hr and 0.86 as weight of MGO...).... then assume high cruise at 75% load and you'll get 150 - 180, which equates to approx 40 GPH.

 

[spannerman]

I was doing the sea trial on a new Nimbus 300S with a D6-370 and was horrified to see the fuel data read out showing 78 l/h at full throttle! reducing the revs by 600 rpm brought it down to 45 l/h.
Same with a Verado 275 outboard, 150 l/h at 5000 rpm, and 60 l/h at 3000 rpm.
Just shows how those last few knots cost dearly.

 

[Hurricane]

Naah... You must more than double that figure, i.e. 50 GPH or so, to get closer to the mark.
Show me a diesel engine rated for 1050 hp which burns 23 GPH at full load, and I'll eat my humble pie on the spot.

I agree but not double
my MTU 1200's do 175 litres per hour each - thats cruising at 24 ish knots

Here's some very interesting facts though.
at 9.5 knots she does about 25 litres per hour per engine
at 6.5 knots she does 7.5 litres per hour per engine - thats a range of 2000 miles!!!!

 

[Canopy Locked]

Naah... You must more than double that figure, i.e. 50 GPH or so, to get closer to the mark.
Show me a diesel engine rated for 1050 hp which burns 23 GPH at full load, and I'll eat my humble pie on the spot.

The OP did say "Cruise"... a 1050hp at WOT would probably burn more fuel in day than I do in a year!

There's only one sure way to find out fuel consumption (in the absence of fuel flow meters) .. brim the tank, run at your cruise rpm setting for a given period of time, brim the tank again and calculate your L/Hr at that RPM... of course it will differ for different throttle settings.

I had read somewhere that 1L/10hp/Hr in a "cruise" was a reasonable rule of thumb... mine does 22l/hr in 2600 rpm cruise however, over the last 60 hrs engine run time she's averaged 10.94 L/Hr

Guess it kinda depends on what you call a cruise speed!

 

[Divemaster1]

So ... my estimate is not too far out then ... " ......... then assume high cruise at 75% load and you'll get 150 - 180"

 

[MapisM]

The OP did say "Cruise"...

Oi, that's what the OP said, but not what YOU said!
You extrapolated the rule of thumb of a liter each 10hp/hr to calculate how much juice 1050 ponies would require.
And since I have the seatrial of a boat with C18 engines handy, I just checked my guesstimate against it: 52GPH at max RPM with 95% engine load - even more accurate that I would have expected myself...
See, there's simply no way you can feed 1050 HPs with 23GPH.
Cruise speed obviously means much lower engine load, hence much lower hp and fuel required - I fully agree with that (in reply also to Hurric).

 

[AndieMac]

Hurricane

Quite surprised to see your consumption figures for cruise speed (175 litres each motor for 24 knots). Understanding from previous posts you have used 50,000 litres in a couple of years and have plenty of electronic data recording equipment etc.. (not doubting you )

Just as a matter of comparison, our company boat runs (now superceded) MAN V12 - D2842LE407 - 882 KW (1200 HP) x2, in a similar boat as yours, although, older (1997).

Has run for 4 years, since current ownership (4075 n/miles and 45,089 litres, so relatively low usage) and only use the old school principle of brim to brim filling and recording (no electronic).
My figures are 125 litres per hour, per motor at 24.5 knots (at 1800 rpm -top of torque curve), and has never altered from each fill.
The boat always travels at this cruise speed, unless in harbour confines, or adverse weather.

BTW the WOT figures for these engines (MAN's) are 240 litres per hour, per motor @ 2300 rpm's, which equates to 33 knots.

 

[capsco]

Oi, that's what the OP said, but not what YOU said!
You extrapolated the rule of thumb of a liter each 10hp/hr to calculate how much juice 1050 ponies would require.
And since I have the seatrial of a boat with C18 engines handy, I just checked my guesstimate against it: 52GPH at max RPM with 95% engine load - even more accurate that I would have expected myself...
See, there's simply no way you can feed 1050 HPs with 23GPH.
Cruise speed obviously means much lower engine load, hence much lower hp and fuel required - I fully agree with that (in reply also to Hurric).

Your figures would seem to agree with mine at WOT then, cruise is difficult to estimate as this can be any speed, he did not say if it was planing or displacement boat.

 

[cataldo]

Sorry,

thinking maybe sunseeker manhattan 64, 00 to 03

vintage,some of them have these type engines

either MAN or CAT.

Thanks for the help

Cathal