|
| |
| Welcome to myHanse.com the forum for Hanse Yachts owners throughout the world. | |
3JH4E cruising RPM |
Post Reply 
|
Page 12> |
| Author | |||
S/V Rocinante 
Lieutenant Commander 
Joined: 19 October 2017 Location: USA Status: Offline Points: 79 |
 Post Options
 Thanks(0)
 Quote Reply
 Topic: 3JH4E cruising RPMPosted: 19 October 2019 at 00:24 |
||
|
Good day all
I’m a bit confused about my Yanmar’s operating range and was hoping for some real world feedback from fellow 400 owners. We typically run at about 2800 RPM which pushes us along at about 6 knots and consumes about 1 gal/hr. I was under the impression that this was the Yanmar recommended max cruising speed, but I’m starting to think that I’m wrong! At what speed (RPM) do you typically run your engines and what kind of boat speeds(SOG) are you seeing (calm conditions and ignoring currents)? What’s a safe max RPM for the 3JH4E? Was just reading a writeup for a 31’ hunter using a 29hp Yanmar (sail-drive) that stated: “Under power, the 31 made 6.3 knots with the engine turning 2,300 rpm at an “economy cruise” setting. A more typical cruising speed of 7.2 knots was sustained at 3,100 rpm, while full throttle yielded 7.7 knots at 3,500 rpm.” Any and all input appreciated! |
|||
|
Carlos & Maria
S/V Rocinante - 2007 Hanse 400e #127 |
|||
 |
|||
|
Fendant
Admiral 
Joined: 03 November 2012 Location: Switzerland Status: Offline Points: 1605 |
Post Options
Thanks(1)
Quote Reply
Posted: 19 October 2019 at 05:17 |
||
|
Hmm, 6 knots at 3800 rpm sound way too low 3800 rpm is imho way too high. There is something wrong with you prop design.
All Diesel engines have a optimum over the rpm range. You need a diagram from Yanmar showing the consumption in grams per hp/hour. Most diesel engines in boats are optimum between 2000 - 2400 rpm, (as bigger the engine as lower the rpm ), in this range you should get about approx. 80% of your theoretical hull speed. 0n my 345 I am getting 6.2 knots at 2100 rpm with a Volvo D1-30 and folding prop. Consumption is around 1/2 gallon/hour ( 1.8 - 2 ltr/hour ). You can calculate your hull speed: LWL = length waterline in meters hull speed (knots) 2.43 times square root of LWL |
|||
|
Frank
|
|||
|
|||
|
Rock
Captain 
Joined: 19 September 2014 Location: Netherlands Status: Offline Points: 328 |
Post Options
Thanks(1)
Quote Reply
Posted: 19 October 2019 at 12:31 |
||
|
Hi Carlos, With a 2007 400e, 3JH4E and flexofold 17-13-3L, hull speed 7.9kn At 1900 rpm, 6.2 kn At 2000 rpm, 6.5 kn Flat out, some 2950 rpm, 7.9 kn Pushing a boat past its hull speed, takes much power. A hunter 31 has 8m waterline, hull speed some 6.9 kn 7.7 kn doesn’t sound realistic My consumption averages between 1.7-2.4 liter per hour. Your 3.8 liters per hour fits with running at (too) high rpm’s As Frank says, your setup is definitely suboptimal, no if and or buts. Solution would be in choosing a prop that fits better. Best regards, Peter.
Edited by Rock - 19 October 2019 at 12:36 |
|||
|
Hanse 400e "M-square2" #0241
|
|||
|
|||
|
S/V Rocinante
Lieutenant Commander
Joined: 19 October 2017 Location: USA Status: Offline Points: 79 |
Post Options
Thanks(0)
Quote Reply
Posted: 20 October 2019 at 00:40 |
||
Thanks Frank, appreciate the input! BTW, you misread; I said 6 knots at 2800, not 3800.
|
|||
|
Carlos & Maria
S/V Rocinante - 2007 Hanse 400e #127 |
|||
|
|||
|
S/V Rocinante
Lieutenant Commander
Joined: 19 October 2017 Location: USA Status: Offline Points: 79 |
Post Options
Thanks(0)
Quote Reply
Posted: 20 October 2019 at 00:48 |
||
Thanks! Tried searching forums, but obviously did a poor job, because I found nothing anywhere near as specific as your response.
Sounded off to me as well, but...
Yep, will have to check what’s on there. I’m the original owner and the prop is the one it came with, never actually checked! Will also double check my engine speed against what the tach is showing... perhaps that’s part of the issue? Thanks again! |
|||
|
Carlos & Maria
S/V Rocinante - 2007 Hanse 400e #127 |
|||
|
|||
|
WEmmens
Lieutenant 
Joined: 18 August 2013 Location: NL Status: Offline Points: 29 |
Post Options
Thanks(1)
Quote Reply
Posted: 20 October 2019 at 20:11 |
||
|
Hallo Carlo,
Having the same setup as Peter on my Hanse 400 I can fully support his RPM's and boat speed. On average I use 2 to 2.25 ltr of GTL per hr. Good luck, Wilko
|
|||
|
|||
|
S/V Rocinante
Lieutenant Commander
Joined: 19 October 2017 Location: USA Status: Offline Points: 79 |
Post Options
Thanks(0)
Quote Reply
Posted: 21 October 2019 at 00:30 |
||
Thank you Wilko - greatly appreciated! I’ve obviously got some sleuthing to do... |
|||
|
Carlos & Maria
S/V Rocinante - 2007 Hanse 400e #127 |
|||
|
|||
|
jeb
Captain
Joined: 05 May 2014 Location: Sweden Status: Offline Points: 214 |
Post Options
Thanks(0)
Quote Reply
Posted: 21 October 2019 at 08:49 |
||
|
I also have a 400e with the Yanmar 40 HP. I'm not 100% sure about my prop size but think it's 18x12 3L or 18x13 3L (will check when at the boats next time). I have a FlexOFold. Max RPM is 3000 and with a clean hull i reach 8-8,1 kn. I normally run at 2400 rpm and speed is close to 7 kn. Don't know about exact fuel consumprion (have not meassured it) but thik it's around 3 l/h.
To me it sounds like you have the wrong prop. Have you tested max RPM? From what I remeber the engine will limit RPM itself (in the 40hp case to 3000+x%). It could also be a wrong calibrated tacho. Here is some info how to calculate correct calibration and how to do it: http://www.ybw.com/forums/showthread.php?263571-VDO-tachos-How-to-callibrate-and-make-them-work This requires that your LCD is still working. If needed you can replace it easy. Just google Volvo Penta LCD Replacement. One source in Sweden: https://www.ssbilbehor.se/volvo-penta-servicedelar/tandstift-packning-mm/lcd-display-timraknare-reservdel-volov-penta-yanmar Its the same LCD for both Yanmar and Volvo Penta. |
|||
|
Jesper
Hanse 400e |
|||
|
|||
|
S/V Rocinante
Lieutenant Commander
Joined: 19 October 2017 Location: USA Status: Offline Points: 79 |
Post Options
Thanks(0)
Quote Reply
Posted: 21 October 2019 at 13:17 |
||
Thanks for the Links Jeb! I’ve not tested yet; currently out of the water getting new bottom paint. Should be back in the water this Tuesday/Wednesday and then it’s at the top of my list! Still trying to figure out which flexofold prop I have. Can’t see any markings on it, so may have to pull blades off to find out. |
|||
|
Carlos & Maria
S/V Rocinante - 2007 Hanse 400e #127 |
|||
|
|||
|
jeb
Captain
Joined: 05 May 2014 Location: Sweden Status: Offline Points: 214 |
Post Options
Thanks(1)
Quote Reply
Posted: 21 October 2019 at 13:59 |
||
|
Regarding the 29hp Yanmar it's max (recomended) RPM is 3600. I use to have a Hanse 371 with that Engine and a 17x11 3L FlexOFold. That pitch was to little, I coud run it up to 3800 rpm and then the limmitation went in. It was originally delivered with a 16x10 3L and that was behaving like you described, high RPM and low speed. I had FlexOFold making a prop calculation for that combination and they came up with 17x12 or 17x13 3L. But, Hanse/Yanmar was afraid overloading the engine and mounted 16x10 3L. After complaining I got a new set of blades (17x11 3L) and it bacame better but not as good as expected.
|
|||
|
Jesper
Hanse 400e |
|||
|
|||
|
Post Reply
|
Page 12> |
| Tweet |
| Forum Jump | Forum Permissions You cannot post new topics in this forum You cannot reply to topics in this forum You cannot delete your posts in this forum You cannot edit your posts in this forum You cannot create polls in this forum You cannot vote in polls in this forum |
|
Links : www.hanseyachts.co.uk www.hanseyachts.com www.fjordboats.co.uk www.dehler.co.uk www.varianta.co.uk |
Topic Options
Fendant wrote: