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Engine performance

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colinc View Drop Down
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    Posted: 09 November 2019 at 10:03
What is your cruising RPM and speed in calm/no tide conditions?  Also what is your max RPM?  And if you know, what size and pitch of prop do you have?

We have the Volvo D2 75 on our 505.   I suspect she is rather over propped as we can only get to 2,400 RPM on full throttle (should be able to get to 3,000).   We cruise at 7kn (just) at 1,900 RPM.   Any higher revs get us going a bit faster but the engine seems very strained - probably due to the over propping.   This is a Flexofold 20" diameter 14" pitch 3 blade.

Would be grateful to confirm this by comparing to other owners, please.

PS I know this depends on type of prop too, however I think prop size and pitch is just as important as prop type - if not more so.  Nigel Calder's testing and writing is pretty good on that. https://www.mysailing.com.au/gear/folding-prop-gear-test


Edited by colinc - 09 November 2019 at 12:10
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kipwrite View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote kipwrite Quote  Post ReplyReply Direct Link To This Post Posted: 09 November 2019 at 14:34
We have a d2-75F engine with the flex o fold 3 blade prop. Not sure of diameter and pitch. 

With the bottom clean, RPMs max out around 2750, and she will do 7.5 kts at 2000 rpms. If I run the RPMs up, she will get to 8+ kts. 

We generally cruise between 1800-2100 RPMs, the lower side giving us much greater range on passages, while still maintaining 7kts (if things are settled). 
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tobo2 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote tobo2 Quote  Post ReplyReply Direct Link To This Post Posted: 17 hours 25 minutes ago at 14:39
We have the newest model of a feathering prop of der German company SPW (Type DF 112, 4 blades, 21", pitch: 13") on our Hanse 508. After one week testing we are not very happy with the performance. We also had turbulences at the rudder. We run quite well at low revs (i.e. 1500 RPM>5 kn) but don't get over 7 kn speed at RPM 2400. (flat water, no wind) The company suggested to run the engine (Yanmar 4JH80CR and SD60) at RPM 2800 crusing speed (!). This can't be the solution, can it? Our Hanse dealer and myself didn't understand this answer. Do you?



Edited by tobo2 - 17 hours 15 minutes ago at 14:49
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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: 16 hours 35 minutes ago at 15:29
I can get 7kn at 2,200 RPM and 8.2kn at 2,800 RPM in a 418 with a flex-o-fold x3 blade
 
So something must be wrong with your set up :(
Hanse 418 #64 EmBer. Hamble, UK
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tobo2 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote tobo2 Quote  Post ReplyReply Direct Link To This Post Posted: 15 hours 54 minutes ago at 16:10
Well Matt1, this is a different story: your yacht is approx. 8 tons and you have a different engine. Ours weights 15 tons and has an 80 hp turbo diesel. My only help are comparative datas of another 508.
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kipwrite View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote kipwrite Quote  Post ReplyReply Direct Link To This Post Posted: 15 hours 32 minutes ago at 16:32
There is a fair amount of rudder turbulence from the prop on these boats, especially at higher rpms. You get used to it and it doesn’t seem to hinder performance. 

Edited by kipwrite - 15 hours 24 minutes ago at 16:40
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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: 14 hours 42 minutes ago at 17:22
Originally posted by tobo2 tobo2 wrote:

Well Matt1, this is a different story: your yacht is approx. 8 tons and you have a different engine. Ours weights 15 tons and has an 80 hp turbo diesel. My only help are comparative datas of another 508.
 
Well I realise that, which is why I drew attention to the fact that I was talking about a 418! Big smile 
 
But is it not unnatural to expect a larger boat to have increased performance? Certainly going from a 31' to my current 40' 418 I expected to be able to cruise under power at a faster speed than on the 31' even though my 418 is twice the displacement of the 31' I previously owned. Just as you would normally expect to sail faster in a longer boat
 
In fact, it was getting broadly similar speeds from my 418 to the 31' that convinced me to upgrade the prop (to a flex-o-fold 3b).….which has transformed her performance (see thread on 418 if you are interested where I have shown the differences across the rev range).
 
 
Hanse 418 #64 EmBer. Hamble, UK
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