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Old 28 March 2009, 15:44   #11
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Oh yeah I know this is a wide open question as for an example in big swells you can be adjusting the throttle constantly. Just needed a bit of a loose bench mark
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Old 28 March 2009, 16:19   #12
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John, used to recon on about 8 gallons an hour. Didn't seem to matter much if that was with a boat full of divers doing 25 knots or opening her up. I think the Yamaha manual gives a max of 60 LPH at flak speed.

Pete
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Old 28 March 2009, 16:38   #13
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John, used to recon on about 8 gallons an hour. Didn't seem to matter much if that was with a boat full of divers doing 25 knots or opening her up. I think the Yamaha manual gives a max of 60 LPH at flak speed.

Pete
Ahh the very man! What size tub did you have the 115 on mate?
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Old 29 March 2009, 04:36   #14
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Viper 5.25m to start with and then a Viper 5.95m. The 5.25m had a lethal acceleration on it with a 17" prop and would easily pop wheelies I would be quite happy with one of those engines on my current rib

If you want to go 25 miles I think you are going to need 4 tanks, btw.

Pete
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Old 29 March 2009, 14:40   #15
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Viper 5.25m to start with and then a Viper 5.95m. The 5.25m had a lethal acceleration on it with a 17" prop and would easily pop wheelies I would be quite happy with one of those engines on my current rib

If you want to go 25 miles I think you are going to need 4 tanks, btw.

Pete

So I'll need 100 litres to do 25Nm?
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Old 29 March 2009, 15:06   #16
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So I'll need 100 litres to do 25Nm?
I hope not that would be nuts.

With that engine on a small rib you are going to be able to cruise at a nice 30Knots without giving it too much grief.

I would bank on 50 litres being ample and you will probably find you only use half.
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Old 29 March 2009, 15:12   #17
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I hope not that would be nuts.

With that engine on a small rib you are going to be able to cruise at a nice 30Knots without giving it too much grief.

I would bank on 50 litres being ample and you will probably find you only use half.
I was gonna say! Even when hammering around I don't use that amount , that quick. Thought I'd get more on a cruise out. Cheers Chris
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Old 29 March 2009, 16:31   #18
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I have found that carb engines use loads more than you really hope for.i,m veryy interested in what you actually used as I,m just now decided to get(being fitted this week) a yam 90hp 2 stroke.would have liked a larger one but do want the best range and speed.Like most things theres a comprise some where.I,m going to make a complete guess and say in calm sea 39 litres any less is wishfull thinking.Good luckand i hope i,m wrong.Matts got a 90hp three cylinder yours is four cylinder so could you guess at using one third more on average as the engines heavier and juiceyer
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Old 29 March 2009, 16:36   #19
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I have found that carb engines use loads more than you really hope for.i,m veryy interested in what you actually used as I,m just now decided to get(being fitted this week) a yam 90hp 2 stroke.would have liked a larger one but do want the best range and speed.Like most things theres a comprise some where.I,m going to make a complete guess and say in calm sea 39 litres any less is wishfull thinking.Good luckand i hope i,m wrong.Matts got a 90hp three cylinder yours is four cylinder so could you guess at using one third more on average as the engines heavier and juiceyer
Didn't manage to get out today as planned but I will be doing the trip in about 2 weeks. I'll let you know. Once had a Alfa 33 with the boxer engine. That had 4 carbs and when it work (which wasn't often) flew like sh!t off a stick but drank like a glaswegian drunk.
There's someone on here called DM who has a bigger engine than me on a 5.4 searider, come out of the shadows and show ya self

What are the twin engines like on fuel Peter?
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Old 29 March 2009, 16:44   #20
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Didn't manage to get out today as planned but I will be doing the trip in about 2 weeks. I'll let you know. Once had a Alfa 33 with the boxer engine. That had 4 carbs and when it work (which wasn't often) flew like sh!t off a stick but drank like a glaswegian drunk.
There's someone on here called DM who has a bigger engine than me on a 5.4 searider, come out of the shadows and show ya self

What are the twin engines like on fuel Peter?
Well i have only been out twice first time still had problem .now sorted out and used 30litres in a hour and a half running about but didnt record how far .Easter weekend will be out with new sat nav.Stormforce 650 for 299.00 so can monitor speed and distance with luck
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