Volvo 63p consumption at 6 knots

[Thepipdoc]

Yesterday we travelled fro Dartmouth to Salcombe (16 miles) at a very sedate 6 knots. It was such a beautiful day andu the sea state was flat, it seemed a shame not to take it all in.
The added bonus of "pootling" of course is the increased economy but try as I might I can't find typical mpg figures for a pair of 63p's at 6 knots.
Can anyone help?
Boat is a sealine F 43

 

[sailorman]

Yesterday we travelled fro Dartmouth to Salcombe (16 miles) at a very sedate 6 knots. It was such a beautiful day andu the sea state was flat, it seemed a shame not to take it all in.
The added bonus of "pootling" of course is the increased economy but try as I might I can't find typical mpg figures for a pair of 63p's at 6 knots.
Can anyone help?
Boat is a sealine F 43

1 ltr per 10 hp per hr used is a good guide

 

[Deleted User YDKXO]

Is 6kts minimum in gear idle speed? My boat does just over 7kts at minimum in gear idle speed and at that speed and according to the engine data display, the boat is consuming fuel at 3.5nmpg. So I would expect the fuel consumption of your boat at 6kts to be around 4 - 4.5nmpg

 

[grumpy_o_g]

Hyper-miling in 50 or 60 foot, 1,000+bhp flybridge cruisers. I've heard it all now...

 

[Bandit]

Posted a while ago:

#44 16-02-12, 05:30
Bandit
Registered User Join Date: Jun 2004
Location: Guernsey
Posts: 1,267

Practical experience

--------------------------------------------------------------------------------

My old boat had 2 x Volvo Penta 63P as does my current boat , good simple mechanical engines.

I have always measured litres per mile and as I have extreemly accurate fuel gauges (Hart) you can easily measure this on a run by run basis.

Old boat Fairline 36 sedan 10.5 tons about 4.5 litres per nautical mile at cruising speed.

St Malo to Dinan and back 31 nm 2 to 3 miles at cruising rest at 5-7 knots or so 1.48 litres per n mile.

My props had a fair ammount of bite ie a fast idle speed about 5 knots. So i would expect if you had a slower idle speed in knots you would better this.

A friend of mine has the same boat in Turkey as i Have now an Aquastar 48 with 63p engines in turkey and due to spending a large ammount of time cruising he runs on one engine only but alternates engines and this seems to work well for him.

See whole thread, copy and paste
http://www.ybw.com/forums/showthread.php?t=304034

 

[Thepipdoc]

Thanks all.

 

[Greg2]

I posted on this very subject a few moths ago and there was a lot of information forthcoming as a result. Worth a browse.......

http://www.ybw.com/forums/showthread.php?t=304034

 

[photodog]

Hyper-miling in 50 or 60 foot, 1,000+bhp flybridge cruisers. I've heard it all now...

Why dont they just get something with sails eh?