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Old 31 March 2009, 09:39   #1
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Osprey fuel consumption

Just thought I would mention to all those interested boaters the setup I have on my 7.0m Vipermax and the relevent fuel consumption: The boat is a 7.0m with a 250 high output E-tec and I am running a 22 pitch Viper on a transom height of 27".

On a very nice trip from Barmouth to Portmadoc on Sunday last the conditions were fairly smooth and I noticed that most of the way the boat was travelling at 33 mph at 3,300 rpm using 33 litres per hour. This proved to be the most economical ratio of fuel used for the distance travelled which surprised me a little because I expected the boat to be a little more economical at about 28 mph when the boat was actually using 29 litres per hour. I think the figures are really good and if anything better than my old 7.0m with a 225 4 stroke engine.

If anybody else has got any comparisons to make reference propellers, engines etc., I think it would be interesting and may save us some money in fuel.

As a footnote the engine's using 94 litres per hour at 5,500 rpm and the boat is doing 57 mph - it's expensive but it's one hell of an hour!

Roy
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Old 31 March 2009, 13:08   #2
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Have an Evinrude 250 DI, the last model befor the E-tec came out.
On a Scorpion 7.5 with closed deck and cockpit, so a bit heavier.
Made a diagram on fuel, speed and RPM's.
The blue line is the speed km/hr.
The pink line is the fuel consumption liters/hr.
The orange line is the distance one can reach with 50 liters of fuel.
For exemple:
with 3000 R/min I use 26 liters/hr and with a speed of 36,5 km/hr cover a distance of 70,2 km on 50 liters of fuel. And that will take me about 2 hours.
The most economical way to travel is between 3000 and 4000 RPM.
At 1000 RPM it's even cheaper but there's no fun.
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Old 31 March 2009, 13:54   #3
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I have a 250 Etec, I have no idea how much fuel it burns at any revs. This is due to the fact that my Icommand instruments speak a different language to my sender and apparently I need some sort of stick to shove up the back of the Icommands inorder to get them to do anything.
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Old 31 March 2009, 14:37   #4
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I can't offer anything about optimum cruising speeds yet, as I've only just got the Lowrance engine gauge to talk to the GPS.

However, based upon last seasons total fuel consumption and log, I averaged 1.17 litres per nautical mile. Best fillup was 1.07 l/nm and worst 1.29. Most of my journeys are at 35kts for passages between 15 nm and 35nm.

Osprey Vipermax 6.5. Weight approx 1200kgs, Suzuki DF200.
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Old 31 March 2009, 17:21   #5
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Quote:
Originally Posted by Mollers View Post
I have a 250 Etec, I have no idea how much fuel it burns at any revs. This is due to the fact that my Icommand instruments speak a different language to my sender and apparently I need some sort of stick to shove up the back of the Icommands inorder to get them to do anything.

Why bother Mollers just get to where yo want to go and do what ya need to do
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Old 01 April 2009, 03:00   #6
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Originally Posted by Bigmuz7 View Post
Why bother Mollers just get to where yo want to go and do what ya need to do
I would I assure you, forward planing is not my forte'. But, buying fuel on those silly Scillies is a nightmare, so when leaving from Falmouth, a degree of measurement is required.
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Old 01 April 2009, 08:22   #7
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osprey fuel consumption

Quote:
Originally Posted by Mollers View Post
I would I assure you, forward planing is not my forte'. But, buying fuel on those silly Scillies is a nightmare, so when leaving from Falmouth, a degree of measurement is required.
Ive got 250 etec on 7.5 Vipermax and I`m with Mollers on this one I have`nt got a chuffin clue how much I`m using because I can`t get the Icommand to tell me anything. I only know what ive used when I fill up again and sometimes it`s a nice suprise and sometimes it`s very definitely NOT!!Think i`m going back to sender unit and gauge on the vipermax and on the latest project. You can keep the clever electronics.
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Old 01 April 2009, 12:40   #8
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Quote:
Originally Posted by humper View Post
Ive got 250 etec on 7.5 Vipermax and I`m with Mollers on this one I have`nt got a chuffin clue how much I`m using because I can`t get the Icommand to tell me anything. I only know what ive used when I fill up again and sometimes it`s a nice suprise and sometimes it`s very definitely NOT!!Think i`m going back to sender unit and gauge on the vipermax and on the latest project. You can keep the clever electronics.
I've spoken to Roy Bishop, Pete, we have the wrong senders. If you give him a call, he replace it. Apparently we also memory sticks which 'Chris' will tell you about.
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Old 01 April 2009, 13:47   #9
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osprey fuel consumption

Quote:
Originally Posted by Mollers View Post
I've spoken to Roy Bishop, Pete, we have the wrong senders. If you give him a call, he replace it. Apparently we also memory sticks which 'Chris' will tell you about.
Hi Chris, thanks for that, i`ll speak to Roy. I could really do with getting that sorted out. Have you been out yet this year? I mean have you launched yet?
Regards
Pete
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Old 01 April 2009, 15:15   #10
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Humper,

To get the fuel data that your engine can supply you need a Memory Module

P/N - 0764181

Its really easy to fit you need to find where all your Network T pieces are(probably in the console) find the connectors then just Tee in this module takes about 5 mins and just screws in.


You can then get trip fuel usage info that can be reset from the guages. As for the tank fuel level then you will need the new fuel sender as Mollers said.

Feel free to PM me if you have any questions. Also I sent you a PM a few months ago about your screen and Stainless surround. Have you got any more PICs as It looks like it offers good protection from the elements.

Chris
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