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Old 15 April 2004, 19:21   #1
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Country: UK - England
Town: Margate / Ramsgate
Boat name: Ballistic
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Optimax fuel economy

Having just returned from a substantial voyage i though some people would like a report on the Opti's fuel and oil consumption.

Tuesday was dead, dead calm all the way from the Solent to Eastbourne, we made 35-42knts all the way and fuel consumption was the highest i have ever seen it, average 0.8nm / li. We used almost exactly 100li, which is about 25% more than i expecred. Most of the time we were sitting at 5000 rpm. We also used an alarming amount of oil, about 3-4litres.

Previously (in 40 hours) we have used a total of 8 litres of oil.

Wednesday was very thick fog, so we sat at a sensiable 20knts (150-200ft visability). Eastbourne-Ramsgate saw fuel consumption rise to an average of 1.2nm/li, using a total of 60litres, and little over a litre or 1.5li of oil. This was acheived with the Dover-Ramsgate leg at a constant 39-41 knts.

What have i learnt? Optimax economy goes out of the window above about 4k - 4500 rpm. Don't go RIBing when it's flat!!!

I'm afraid i have no pic's of this trip because i forgot the CF card for the camera but i'm extremely happy with the long-distance cruising ability of top-banana after completing the 200nm trip back from Poole. Interestingly i also met another top-banana in Eastbourne - not nearly as banana shaped though

Hope the figures help some people looking at engine choices! Given 50 hours of running now i would still choose an optimax.
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Old 15 April 2004, 19:33   #2
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Country: Ireland
Town: Carigaline/Baltimore
Boat name: XS-600
Make: XS-Ribs
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Engine: Merc Optimax 150 XL
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Had the same experience last wkend with my friends tornado/ 135 optimax. Sea was like glass. Ended up chasing ferries to get some waves. Spent most of the wkend at around 4000-4500. Very expensive wkend, Opti oil is a bit more expensive over here too!!

When I've got my own I'll just have to have a bit more discipline. Can't wait though, Optis are great engines. Those first couple of weeks are gonna hurt the wallet. It'll be worth it though!!
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Old 16 April 2004, 04:15   #3
RLS
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Hi Daniel,
What is the accelleration like on top banana with the 150 opti? Also what is the dead rise? What is your flat out speed too? I am just wondering as my new 6.4 is arriving hopefully a week on sunday with a 200 opti.
Look forward to hearing.
Thanks
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Old 16 April 2004, 04:19   #4
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Some more info...

Deadrise - unknown, will attempt to find out.

Top speed so far is 46 knts @ 5200 RPM. Can't pull top RPM but i like it that way - think economy!

Over the last few days we only managed 43knts, but were 3 up + about 200li fuel + overnight luggage for all.

Yesterday i managed in excess of 40knts with 5 up and around 150li fuel.

The acceleration is great, don't know how to describe or measure it but straight on the plane. Your boat will go like stink with a 200opti, bet you can't wait!
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Old 16 April 2004, 04:26   #5
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Thanks a lot, always great to get an insight how the baby is going to run.
Your right I can't wait especially with all this nice weather we've been having!
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Old 16 April 2004, 07:21   #6
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Country: UK - Wales
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My point about Opti's and fuel economy has always been that you get a lot of economy at a considerably cheaper cost than a four stroke. If me memory serves me well the 150 redlines at 6k ( and the limiter cuts in shortly after that) so at 5k you are using more than 82% of useable power and all engines start to suck it up at that speed.

I think that's a very reasonable fuel consumption for what is a high speed passage.

I very much hope to have my Opti back on the water soon, and will look forward to putting in as much fuel as the little baby wants.

I know one guy with a 7.5 and a large Yammie four stroke that sucks about 70 litres at 47 knots.

Also having had the pleasure of getting to know you and Tappy better lately you could always rename the boat to Top Bandana if there was too many Bananas in the bunch
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Old 16 April 2004, 07:56   #7
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Old 16 April 2004, 08:29   #8
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Flat sea temptation

Hi

Our HPDI uses a load more fuel once you get the revs over 4000. Running at 4000rpm we get 40mph.

We went round the island on easter sunday and burned 75ish litres without much effort at all. Not sure about the oil usage - the HPDI doesnt seem to use that much, but it uses a load more when you're hammering the engine.

As you say Daniel, its far too tempting to floor it when its calm. Running for a long time at 5000rpm does sound like quite a lot of work for the engine, so I'm not surprised you used a load of petrol.

Ricky.
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Old 16 April 2004, 08:54   #9
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Country: Greece
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Daniel tyhis engine is dead economic to run. Impressive figures there!
I want to see what you would have said if you had a VMax
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Old 16 April 2004, 11:34   #10
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Thought I recognized the name Top Bannana, saw you in RMYC in Poole last weekend.

Mark
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