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Old 14 August 2013, 17:44   #11
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Country: UK - England
Town: Basingstoke
Boat name: The Titanic I guess
Make: Yam 340S
Length: 3m +
Engine: 15hp outboard
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Originally Posted by gridge View Post
50 litres??? where were you planning to go?
A friend bought the tank some years ago.

Bombing around the needles, Isle of Wight I have in the past gone through half the tank in 2 hours or so. Perhaps it is burning fuel a little inefficiently?

At full power how many litres/hour would you expect a 15hp engine to burn?
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Old 14 August 2013, 17:47   #12
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Are you sure some upset angry narrow boater didn't hide your engine?
No seriously, bad luck,
If your mainly using it on the canals, why don't you go for a smaller four stroke. There may be some advantages.
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Old 14 August 2013, 17:49   #13
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Quote:
Originally Posted by neil9327 View Post
A friend bought the tank some years ago.

Bombing around the needles, Isle of Wight I have in the past gone through half the tank in 2 hours or so. Perhaps it is burning fuel a little inefficiently?

At full power how many litres/hour would you expect a 15hp engine to burn?
10% of rated power in gallons per hour at WOT seems to be a safe rule of thumb.
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Old 14 August 2013, 17:53   #14
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Country: UK - England
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Boat name: The Titanic I guess
Make: Yam 340S
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Engine: 15hp outboard
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Quote:
Originally Posted by Sunstreaker View Post
Are you sure some upset angry narrow boater didn't hide your engine?
No seriously, bad luck,
If your mainly using it on the canals, why don't you go for a smaller four stroke. There may be some advantages.
Well who knows.. I guess I could go back to the scene and have a hunt around for it, but I'm not sure it would be worthwhile. I did pass a fisherman a few hundred meters before though.

The only reason I was on the canal was that it was windy down on the solent, and I didn't want to risk having the boat blow over, as has nearly happened in the past.
So the engine needs to be for both inland and offshore use.

The basingstoke canal is a little gem, because it is very little used (I passed only 2 other boats moving) and has few locks (excepting the section near Brookwood).
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Old 14 August 2013, 17:58   #15
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Country: UK - England
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Make: Yam 340S
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Quote:
Originally Posted by Max... View Post
10% of rated power in gallons per hour at WOT seems to be a safe rule of thumb.
10% of 15hp is 1.5 gallons/hour = 6.8 litres/hour

Over 2 hours is 13.6 litres = 26% of the tank.

So my engine was running at around 50% efficiency given that I had used around half the tank.

..maybe it was time to get a new engine then
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Old 14 August 2013, 18:01   #16
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I got seriously moaned at by someone at the Wey end of the Basingstoke canal cooper of months ago . I was chugging along on a 62 ft NB, I must have been doing all of 4mph. I am having a bit of a four stroke conversion after my recent 2 stroke problems.
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Old 14 August 2013, 18:31   #17
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Just me (72Kg). No kit.

So it looks like a yes then

Thanks all!

Hopefully I won't get my new motor nicked too.

I think I was a bit unlucky with the current one. I had tied my boat up on a disused dredging boat on the Basingstoke canal near Aldershot (UK) specifically to keep it away and partially hidden from a car park adjacent to the public slipway there. I was only gone 2 hours during twilight while I returned to Winchfield to collect my car. The thief had to jump a 80cm gap between the dredging boat and the canal bank carrying the motor at the same time - must have been more athletic than me!
And they had it away with a 3/4 full 50-litre fuel tank too.
I reported it to the police. But I can't expect them to find anything.
It was only an old motor which was a beggar to start. But I had grown a little fond of it <weep> lol
Lock it. Lock the handles and if you want drill a hole through the transom and run a cycle lock through that or a handle on the tube. Run a cycle lock cable through everything. They're chancers and scum. Little ferrets. They'll be put off by hassle. If you're not planning on taking the engine off, cover the clamp handles in grease. Stops rust but also puts off the pikeys.
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Old 15 August 2013, 04:22   #18
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If you want a lightweight engine why not get a Tohatsu 9.8?

It only weighs 26kg (the same as a 4hp four stroke) and my Zodiac 2.85m SIB will achieve just under 20 mph with two of us on board, using this engine.
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Old 15 August 2013, 20:33   #19
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At wot, most 2 strokes OB's consumes 12% of it's rated HP per hour. That's with a lightly loaded boat.

Happy Boating
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Old 16 August 2013, 00:59   #20
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At wot, most 2 strokes OB's consumes 12% of it's rated HP per hour. That's with a lightly loaded boat.

Happy Boating
Are you sure? My 8hp Mariner 2T does 10 litres per hour at WOT on a two man 3m SIB. Planing at 18 kts.
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