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Old 23 August 2018, 17:18   #1
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willk's Law #2

The fuel tank volume on a rib will approximately equal the recommended petrol engine power, litres v HP.

Your thoughts pls?

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Old 23 August 2018, 17:31   #2
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Our internals are 140L and we have a 175hp, max 200hp. The Humber 6.3s are often seen with a 150 though so...
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Old 23 August 2018, 18:33   #3
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225 and 225 here,though the boats are often seen now with 250.

I'd noticed it too.
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Old 23 August 2018, 19:01   #4
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225l and 250hp....pretty close.
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Old 23 August 2018, 19:10   #5
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160L and 150hp
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Old 23 August 2018, 19:41   #6
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50L & 150Hp, but I like it hard & fast!

Time to introduce another law very pertinent to boat mending:

Hofstadter's Law: It always takes longer than you expect, even when you take into account Hofstadter's Law.
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Old 23 August 2018, 22:55   #7
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willk's Law #2

I think as Rules of Thumb go you are not far off (crudely at WOT it will give you over 2.5 hrs and likely >4hrs cruising without refuelling)

What was Law#1 though?
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Old 24 August 2018, 03:05   #8
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willk's Law #2

180l 140hp; better looking at it than for it
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Old 24 August 2018, 03:15   #9
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188L 150hp
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Old 24 August 2018, 03:42   #10
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220l / 275hp
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Old 24 August 2018, 04:22   #11
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120l - 150hp
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Old 24 August 2018, 05:12   #12
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2.5m Rib - 10L with 8hp
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Old 24 August 2018, 05:32   #13
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I wondered about us sibbers... but yep the rule broadly follows. Happy with 12l tank for 10hp and always used 25l for 20hp.
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Old 24 August 2018, 05:59   #14
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when i had the rib 70ltr fixed tank for 90 hp 50 ltr in two loose tanks coupled up under suicide seat

sibbing

43ltr for 25hp 2.9 miles /ltr carrying 81 ltr for our skye trip of 160 miles end of the month with pikey soon as look at than for it

suzuki state 3.9 mils / ltr but i get 2.9
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Old 24 August 2018, 08:04   #15
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Official capacity of 52 lt but filled to the neck the tank holes circa 58 lt on a 60 hp etec
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Old 24 August 2018, 08:37   #16
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120l - 150hp and 90l - 50hp
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Old 24 August 2018, 09:42   #17
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315hp (diesel) and somewhere in the region 350-400l....

I've never emptied it completely to test the exact volume!
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Old 24 August 2018, 11:01   #18
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200L - 200HP
100L - 60HP
12L - 50HP
25L - 15HP

Almost!
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Old 24 August 2018, 11:32   #19
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140l - 125hp
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Old 24 August 2018, 11:42   #20
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550 litre / 700hp
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