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Passage Planning speeds

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Matt1 View Drop Down
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Joined: 10 March 2019
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    Posted: 15 May 2019 at 06:52
Hi
 
I realise it's like asking how long is a piece of string, with a huge number of variables, but what are fellow 415/418 owners using by way of a passage planning speed?
 
1) Under power
2) Under sail
 
Thanks
 
Matt
 
 
 
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415 Singapore View Drop Down
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Joined: 23 September 2013
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 415 Singapore Quote  Post ReplyReply Direct Link To This Post Posted: 15 May 2019 at 10:45
Hi, as you say how long is a piece of string! For longer passages when we want to get somewhere reasonably quickly we work on 7 knots, but in SE Asia that can involve quite a lot of motor sailing. 
On a 560 nautical mile trip from Singapore to Phuket we averaged 7.3 knots with first two days motor sailing and last two sailing in a good 15-20 knot breeze. Even in the lightest wind the main will help both steady the boat and the speed. If it works use the jib or even gennaker. 
We have found 7 knots under engine to be reasonably economical on the fuel. 
All the best
Paul
Paul - Night Train - 415 #136
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High Time View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote High Time Quote  Post ReplyReply Direct Link To This Post Posted: 15 May 2019 at 11:35
Hi Matt

For cross channel and northern France passages I use 6 knots for sailing cross tide or 7/8 if down tide, especially in CIs and northern France. I usually beat the 6 knot plan, but better to be early for a gate/lock than too late! 'Conservative' passage planning avoids hard motoring to reach a destination on time

For motor sailing, I agree that 7 knots is good.
Roger

High Time (415 #038)
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Matt1 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Matt1 Quote  Post ReplyReply Direct Link To This Post Posted: 15 May 2019 at 12:16
Thanks everyone - very useful

Matt
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High Time View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote High Time Quote  Post ReplyReply Direct Link To This Post Posted: 15 May 2019 at 14:26
No problem.

BTW - it's helpful (and interesting) to others if you include a couple of details about your boat after your signature. See the examples above from Paul and myself if you're not sure what to include.

Thanks

Roger
Roger

High Time (415 #038)
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Simon L View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Simon L Quote  Post ReplyReply Direct Link To This Post Posted: 16 May 2019 at 19:28
What revs do people motor at (I have the 40hp engine, so I guess I'm asking people with the same engine). I don't think I motor at the speeds some are suggesting here - perhaps 6 knots.

I passage plan at 6.3, and usually that comes out about right, with a mix of sailing, m/s and motoring. Generally push around at 2,500 revs, up at 3,000 if I'm trying to beat a tidal gate.
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Mark_J1 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mark_J1 Quote  Post ReplyReply Direct Link To This Post Posted: 17 May 2019 at 22:47
On a Yanmar 3JH4E 39hp and a featherstreeam prop: 1800 rpm for optimum fuel burn v speed.  2400 rpm when against tide and wind and late for the lock (& pub!).  2800 rpm on the run to the fuel berth to clear the cobwebs from the engine.

My passage planning (on a 400e) assumes 5kts +/- tidal stream.  We often beat that by a mile, but it allows for contingency and a the choice to sail or motor.    

Worth mentioning that rev's v speed depends on lot on the choice of prop (& it's settings) and the amount of cruising gear onboard.  

Mark
Hanse 400e "Grey Goose" Hull #31
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Fendant View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Fendant Quote  Post ReplyReply Direct Link To This Post Posted: 18 May 2019 at 01:09
I am running my D1-30 at 2200 rpm, this is the most economical fuel burn according the Volvo diagrams.
Frank
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