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Old 08 May 2013, 08:13   #1
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Fuel

Hi

I know this is probably a difficult question to answer but I am thinking of going on the round isle of wight trip which is coming up.

I normally carry 35 litres of fuel 1 tank + 10 litres spare. I am trying to work out very roughly how much fuel I will need to carry. i am going to buy a spare 25 litre tank this weekend so will then have 50 litres.

55 HP Suzuki 2 stroke.

Any ideas would be welcome.

Thanks
Pete
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Old 08 May 2013, 08:21   #2
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It's going to be about 55nm round the IOW plus you have to get to Wootton and back so I suspect you will need more than 50l
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Old 08 May 2013, 08:40   #3
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Thanks for that

I see there is a fuel stop at Yarmouth which should help !!.

Pete
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Old 08 May 2013, 11:15   #4
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Of course it all depends on how big a rib that 50HP is pushing, no of persons onboard, how hard you drive it, etc. A 4m rib, one person onboard, not being used at WOT may get round on 50l with plenty of unused fuel as reserve.

If you give details of size of rib, number of persons onboard, driving style, others more knowledgeable than me will be along to advise.
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Old 08 May 2013, 12:15   #5
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Sorry, should have said it is on an Avon SR4 possibly on my own maybe one other.

Pete
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Old 08 May 2013, 12:33   #6
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I have only just got my own SR4 so have not yet worked out fuel consumption, but i would have thought it was well under 1l per nautical mile, possibly as little as 0.5l per nm. Try asking whisper or peterm as they have both had SR4's with 40 or 50 2 strokes.
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Old 08 May 2013, 12:38   #7
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Thanks I will.

I only got mine last year, I am going to try and work out fuel consumption this weekend using the GPS.

If I manage to work it out I will post it as a matter of interest.

Thanks again for your comments.

Pete
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Old 08 May 2013, 12:59   #8
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How are you enjoying your SR4? Only bought mine a couple of weeks ago and had it's maiden voyage last Saturday evening (went out for about an hour)

I was surprised how good the acceleration was, and she gives a much greater sensation of speed than the larger ribs I usually helm. Staying on the jockey seat may be a challenge though
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Old 08 May 2013, 13:28   #9
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I am really enjoying her it is a very capable craft for the size and a lot of fun with the 55 hp Suzuki on the back !!

I owned a 5 m ribeye before this which was a family boat but now I am on my own the Avon is a good size to launch and recover single handed.

I have got her up to 35 mph on the GPS this year but as you know it feels a lot faster !!

Pete
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Old 08 May 2013, 17:09   #10
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i was told when i had 2 strokers that fuel consumption was 1 gallon /10 hp.

so your 55hp would be looking at 5.5 gallons / hour or 25 litres/hour.

which for a SR4 with 55hp guessing your top end is 30 knots....so that would work out at just under a litre/NM

i had twin 65's and this formula worked pretty well for them

glad ive got a 4 stroke 250 now
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Old 09 May 2013, 02:31   #11
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so your 55hp would be looking at 5.5 gallons / hour or 25 litres/hour.
:
WHAT!!! I do that with with twin 115 Etecs or thereabouts
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Old 09 May 2013, 04:09   #12
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Have a search ofr "fuel consumption" - pekty of posts in the past.

My humber is 5m & clocks in at 430-ish Kg (without me!). With the aeging 60 I have a recorded 0.83 L / NM if I stick at around 20- 22 Knots. I'm waiting for a calm day to nail the throttle for an extended period to see what it does to the drinking figures.

Other option - any boating mates you could borrow a tank from? I had to buy a Tohatsu connector to make a 3" long adaptor hose for Easdale as I borrowed a friend's tank.
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Old 09 May 2013, 04:17   #13
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Quote:
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I am really enjoying her it is a very capable craft for the size and a lot of fun with the 55 hp Suzuki on the back !!

I owned a 5 m ribeye before this which was a family boat but now I am on my own the Avon is a good size to launch and recover single handed.

I have got her up to 35 mph on the GPS this year but as you know it feels a lot faster !!

Pete
They definitely feel a lot faster than they are

NathanK did RTIOW last year in a SR4. Maybe he can tell us how much fuel he used.
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Old 09 May 2013, 04:52   #14
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Thanks to everyone for their comments and help I think if I work on 1L per mile I should be ok and hopefully over cautious !!.

For the trip I will have 2 25 L tanks + 10 L in reserve.

Cheers
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Old 09 May 2013, 05:42   #15
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Quote:
WHAT!!! I do that with with twin 115 Etecs or thereabouts
yes but etec's arent fuel drinking basic 2 strokes !

this gauge of 1 gall /10 hp was for the old standard basic 2 stroke engines, carb's only... so no fuel injection, no returning fuel with lean burn etc..

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Old 09 May 2013, 07:56   #16
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yes but etec's arent fuel drinking basic 2 strokes !

this gauge of 1 gall /10 hp was for the old standard basic 2 stroke engines, carb's only... so no fuel injection, no returning fuel with lean burn etc..

Phew! Thank goodness for that
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Old 09 May 2013, 08:00   #17
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Phew! Thank goodness for that
Bet they're a bit thirsty if you run everywhere at WOT with a grin on your face and only the prop in the water as most SR4 owners do though
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Old 09 May 2013, 08:06   #18
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Sorry, should have said it is on an Avon SR4 possibly on my own maybe one other.

Pete
Were you out and about in Poole over the weekend ? Identical SR4 & 55Suz at Baiter Park on ther weekend......

Pete
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Old 09 May 2013, 08:22   #19
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Yes that was me on Sunday, took my Sister and nephew out to Studland and then down to Bournemouth.

A good day out.

Pete
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Old 09 May 2013, 08:25   #20
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Yes that was me on Sunday, took my Sister and nephew out to Studland and then down to Bournemouth.

A good day out.

Pete
Ah ..so it was you I spoke to briefly ! We are everywhere ! Nice boat
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