Fuel comsumption Tamd 61A

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Fuel comsumption Tamd 61A

Postby symon » Mon Dec 11, 2017 2:13 pm

I have twin Tamd 61A on fairline phantom 41 (1992) cruising at 18Kt what would I expect per mile ,engine are serviced and running fine . :roll: :roll: :roll:
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Boat: phantom 41

Re: Fuel comsumption Tamd 61A

Postby Gyula Huszar » Mon Dec 11, 2017 8:45 pm

I'd estimate 90L./hr. at 17 knots. I use 80L./hr. of petrol pushing a 6 ton boat with similar horsepower at around that speed. Diesels, being more efficient and all that, should get twice the bang for the fuel volume buck. Having said that, hull smoothness really figures into the fuel economy as evidenced yesterday when I was out 'scraping the bottom' by zipping around at up to 25 knots. Before pushing it up to speed, and bear in mind that it has only been in the boathouse 2 weeks since the last 'scrape', at my preferred throttle settings for cruise, Playmaker could only achieve 14.7 knots until the 'scrape', whereupon it was comfortable doing 17.5 at the same settings.
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Re: Fuel comsumption Tamd 61A

Postby Murv » Tue Dec 12, 2017 3:20 pm

I think Guyla's estimate is fairly good.
It doesn't copy very well, but the below is from the tables for my Fairline turbo 36 with TAMD61A's. Data is for both engines. An 18 knot cruising speed for us, with a real World load, would be nearer to 2300 rpm; 77 litres per hour and 1mpg.

RPM 1000 1200 1400 1600 1800 2000 2200 2300 2400 2500 2800
Speed - knots 8 9 10.5 13 18 22.5 22 23 24 27.5 31.5
Engine G/H 4 5.4 7.4 9.6 12 15.2 16 17 19.6 22.2 27.6
Engine L/H 18.18 24.55 33.64 43.64 54.55 69.10 72.74 77.28 89.10 100.92 125.47

NM/G 2 1.67 1.42 1.35 1.50 1.48 1.38 1.35 1.22 1.24 1.14

Boat is older, but probably similar spec; around 10 tons and 42.5' length overall.
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