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problemi elica

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Stella*Nova View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Stella*Nova Quote  Post ReplyReply Direct Link To This Post Posted: 11 September 2008 at 16:42
On my last Hanse 341 I had the same engine and the same Saildrive. The prop was also a Flex-O-Fold, but I think with other dimensions. Full speed I had app 4200 rpm and Speed max 7,5 knots.
 
On my recent 370 the prop dimension seems to be better.
BR Ralf, Ex. 'a mare' H370
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Gregor View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Gregor Quote  Post ReplyReply Direct Link To This Post Posted: 11 September 2008 at 19:36
With my 311, I can make 3200rpm, 7-6.9knts, 3 blade folding prop and a Volvo Penta with 19hp.
Gregor
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salepepe View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote salepepe Quote  Post ReplyReply Direct Link To This Post Posted: 14 November 2008 at 11:58
I'd just try a Variprofile two blades fitted on a 370 by Nautilus in Rome it seems to be working very weel, in going to fit it on my 400 wich is on is way from Greifswald.
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PekkaL View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote PekkaL Quote  Post ReplyReply Direct Link To This Post Posted: 15 November 2008 at 12:11
I have plotted my 371/Yanmar 29hp speed / revs in calm conditions, heavy boat  with a clean hull:
- 6 knots at 2500 rpm
- 7 knots at 3200 rpm
- 7.3 at 3600

see the graph at:
http://www.pbase.com/pekkal/image/70789903.jpg

Regards,
pekkal
S/Y Vedette
Pekka Leppanen, "Vedette"
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panos View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote panos Quote  Post ReplyReply Direct Link To This Post Posted: 15 November 2008 at 12:26
Hi,
Beautiful pictures you have in your site Pekkal!
Panos

Hanse 630e - selling her -
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Gregor View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Gregor Quote  Post ReplyReply Direct Link To This Post Posted: 15 November 2008 at 12:40
Absolute true Panos. Nice taken.

Gregor
Uisge Beatha

Currently sailing Dehler 36 JV (2002)
Previous boat: Hanse 311 #80

http://www.uisge-beatha.eu
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MatsG View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote MatsG Quote  Post ReplyReply Direct Link To This Post Posted: 18 September 2009 at 20:40
I have a 371 with Yanmar 39Hp. With 3 blade Flexofold 17"/11" I reach about 3400rpm full thottle, that is too high for this motor. According to Yanmar dealer I could use a Flexofold 18"/12" but with this propeller is a little bit too big and it would be just a little bit hard work for the 3JH4. I do maximum about 8 knots on the GPS.
Cruising speed I do 6.5-7.2 knots, never more than 90% of maximum rpm.
I think the maximum rpm is highly depending in propeller size an workload.
/MatsG

Edited by MatsG - 29 September 2009 at 20:36
MatsG 371
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karina View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote karina Quote  Post ReplyReply Direct Link To This Post Posted: 24 September 2009 at 20:14
Hi Sergio,
 
our 371 goes 7,5 kn with Volvo 2030 (29hp) and a 2 blade folded propeller at 3600 u/min (nearly no wind, small waves).
Before we had a Beneteau with Yanmar 3YM (21hp). The Yanmar is specified with 3650 U/min max. (at 10% of engine hours).
Perhaps your Yanmar has a problem. Check the max. U/min in the neutral gear position. Is the engine able to reach very quickly 3650 U/min?
If yes, it seem that your propeller has to much load for the engine (too big or too much pitch). Ask at Hanse-Yachts after sales support or Yanmar for the correct propeller data and compare.
 
Best regards,
Rainer
 
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takomitak View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote takomitak Quote  Post ReplyReply Direct Link To This Post Posted: 05 November 2009 at 12:21
Ciao Sergio, io ho un 470 e durante la scorsa primavera-estate ho messo a disposizione la mia barca ad un amico che Ŕ il titolare della Max Prop per testare una nuova elica con passo variabile dinamico. In pratica si tratta di un'elica (nel mio caso a 4 pale) che, oltre al solito sistema di pale orientabili e passo regolabile, ha nel suo interno un elemento elastico in acciaio speciale che rende il passo dinamico, in paratica si modifica automaticamente in base alle condizioni del mare e del vento. Tanto per darti dei riferimenti, con la normale elica fornita da hanse la mia barca raggiungeva 7,8 kn a 2400 giri (75 cv), con la nuova elica in condizioni di mare e vento calmi, raggiunge 8 kn a 1800 giri mentre a 2400 giri sono a 9,2 (quasi oltre la velocitÓ critica). La cosa interessante Ŕ che le pale sono sempre in movimento sul loro asse e quidi il passo si regola da solo. Se ti interessano maggiori info puoi chiamarmi 348 1342682
Ciao e buon vento
Petro 
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