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Old 22 August 2005, 16:09   #1
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Country: Norway
Town: lillestrÝm
Make: bombard 550
Length: 5m +
Engine: yamaha O.B. 75
Join Date: Sep 2004
Posts: 22
Gas gas gas

On one of my many test i did one this sunday too.

I ran my rib on a freshwater lake at calm weater with me and 1 person 70 liters gas and some home-sickeness.

the test was to see how far / long i could run 1 liter of gas (95 octane).

I mesured the speed with a gps and monitored the rev. and time.

the results follows:

Nr 1 15,5 kts 2600rpm 3min 45sec.
Nr 2 20,0kts 3000rpm 3min 15sec.
Nr 3 28,0kts 4000rpm 2min 15sec.
Nr 4 30,6kts 4170rpm 1min 55sec. WOT.


driving home i did not find eny perquliar about these figures, as i have always learned that fuel/time rate raises fast at max speed.

som time later i realised that it was not at WOT. the consuption / NM. was highest, but at the lowest speed!

the numbers are as follows:


Test Liters / NM distance sec. Liters / hrs.
Nr 1 1,032 1793m 225 15,99
Nr 2 0,920 2006m 195 18,5
Nr 3 0,950 1944m 135 26
Nr 4 1,023 1810m 115 31

I guess the testing will go on for a while, as every modification needs my greedy eyes as petrol here runs for 10,5NOK ( 8.91£)

See y around
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Old 22 August 2005, 19:44   #2
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Country: Ireland
Town: Carigaline/Baltimore
Boat name: XS-600
Make: XS-Ribs
Length: 6m +
Engine: Merc Optimax 150 XL
Join Date: Feb 2004
Posts: 682
Quote:
Originally Posted by pellesmil
som time later i realised that it was not at WOT. the consuption / NM. was highest, but at the lowest speed!
You probably weren't planing fully at that speed. Ever tried throttling so that you're only half-ways on the plane. Consumption figures can be alarming!!

This will probably annoy you though, my 150 Opti averages 1.2 nm/litre and can do 1.5nm/litre if I'm careful with the throttle (ie:25-30kts). I'm guessing you're running a 2-stroker then!!
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Old 23 August 2005, 03:28   #3
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Country: Belgium
Make: Osprey
Length: 7m +
Engine: 250 HP E-Tec
Join Date: Nov 2004
Posts: 258
Quote:
Originally Posted by swginn
Ever tried throttling so that you're only half-ways on the plane. Consumption figures can be alarming!!
We did that some time ago. We had to follow an other boat who was only going at 15 kn
consumption at:
3kn = 1l/h
5kn = 2l/h
8kn = 15l/h
14kn = 40l/h (that hurts!!!)
and when it starts planing speed goes up and consumption is going down
16kn = 30l/h
25kn = 25l/h
30kn = 38l/h
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Old 23 August 2005, 11:18   #4
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Country: Norway
Town: lillestrÝm
Make: bombard 550
Length: 5m +
Engine: yamaha O.B. 75
Join Date: Sep 2004
Posts: 22
Quote:
Originally Posted by pellesmil

I guess the testing will go on for a while, as every modification needs my greedy eyes as petrol here runs for 10,5NOK ( 8.91£)

See y around
Not quite awake yesterday , this is what it should read:

I guess the testing will go on for a while, as every modification needs my greedy eyes as petrol here runs for 10,5NOK/liter ( 0,89£/liter)
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