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New 348

Printed From: myHanse.com
Category: Hints & Tips
Forum Name: 345/348
Forum Description: 345/348 Hints, Tips and News
URL: https://www.myhanse.com/forum_posts.asp?TID=15127
Printed Date: 27 March 2026 at 03:41
Software Version: Web Wiz Forums 12.06 - https://www.webwizforums.com


Topic: New 348
Posted By: colin1
Subject: New 348
Date Posted: 22 May 2025 at 15:53
Hi,
We currently have a 2007 315 and are considering changing up to a 348. I'd be interested to hear from anyone else who has made the same change but one question we have right now is on the engine. Some sources seem to say the 29hp engine is the favoured option? Since our main use is coastal day sailing mainly south coast of UK, I just wonder whether the larger engine would have many advantages for us?
Any thoughts welcome
Thanks 
Colin 



Replies:
Posted By: samuel
Date Posted: 22 May 2025 at 20:46
Having changed the MD2020 volvo in my 2003 version 311 for a D1-2030 & new saildrive, I find the difference is well worth it. That is on a 31. I could not imagine a 20 Hp on a 348 being much good.
My performance (With the same Brunton Autoprop) has gone from cruising average 5.9Kts & max in flat water and no wind 6.8 kts, -- to cruising 6.5kts & max out at 7.5 kts in a bit of chop & quite breezy head wind. Drive through 1metre chop has improved considerably, which is a problem with Brunton Autoprops.
Of course this a 31 with an autoprop & does not fully answer the Op's question but I would really consider the larger power unit.
Speeds are through water irrespective of current.



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Daydream Believer- Hanse 311- No GBR9917T- Bradwell Essex


Posted By: Dubs2021
Date Posted: 22 May 2025 at 23:46
We acquired our 348 in 2021 and had no choice of options (during the post-pandemic supply chain era, a seller's marketk), so it came with the 3YM20 engine. After almost 4 years and just over 200 hours on the Yanmar, I like this choice as an auxiliary engine. Usually I only use the Yanmar in and out of the harbor, day sailing. On our annual 3-4 week cruises, I sail whenever I can. However, we once had to motor 50.6 NM with no wind, and we averaged 5.7 KPH. Fuel economy on a day like that is 0.6 GPH, which I consider spectacular. 

Is more horsepower better? Weigh out the differences in weight, dependability and fuel economy. In prior power boat progression, we went from a Volvo Penta D3 @ 200 HP on a 27' cruiser, to a D4 @ 300 HP on a 31'. Fuel economy suffered substantially, weighed against a more spacious and seaworthy boat.  


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Hugh


Posted By: colin1
Date Posted: 23 May 2025 at 20:35
Thanks very much for those thoughts. Just one of our considerations at the moment but useful to hear your views


Posted By: samuel
Date Posted: 24 May 2025 at 08:44
I would make the point that on both my single handed round UK trips (Via the calledonian canal) I used the engine 30% of the trips. Others have reported just as high % some more.
5.7Km/h is just slightly above walking pace & if one had to meet a tidal gate against a head wind & chop that would be reduced significantly. 
Trying to cover the last 3-4 miles in to Dover having missed the tide, against wind & a steep chop can be hard work. Sailing is not always the option.
As for fuel consumption I consider the cost of a couple of extra litres of fuel irrelevant in the grand scheme of things
The 30 is 20KG more than a 20 which is not that much to affect a 35  ft boat low down so just put a little less excess baggage on board when going off on a trip


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Daydream Believer- Hanse 311- No GBR9917T- Bradwell Essex


Posted By: Fendant
Date Posted: 21 August 2025 at 09:12
I think, there is a misunderstanding. 20 or 30 hp engines deliver a speed of 5.7 - 6.2
nm/hr at crusing rpm ( ~ 2000 - 2200 rpm ). 
Average Consumption is 2 ltrs / hr on ny d1- 30 measured over 500 motor hours. On my last boat (30") I had a 21 hp Yanmar and got an average og 1.8 ltr/hr.


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Frank


Posted By: samuel
Date Posted: 01 September 2025 at 21:00
Originally posted by Fendant Fendant wrote:

I think, there is a misunderstanding. 20 or 30 hp engines deliver a speed of 5.7 - 6.2
nm/hr at crusing rpm ( ~ 2000 - 2200 rpm ). 
Average Consumption is 2 ltrs / hr on ny d1- 30 measured over 500 motor hours. On my last boat (30") I had a 21 hp Yanmar and got an average og 1.8 ltr/hr.
I have just come back from a 21 day holiday in Ostend so i took a much closer look at the figures. This time I had my boat lifted & jetwashed on the 7Th august. I made sure that they also washed under the straps as well . We departed on the 10th so the hull was perfectly clean
I had filled the tank & had run the engine in the berth for 2 hours charging batteries on a fast tickover. We left for Ostend & motored the 88 mile trip (Due to my health)  taking exactly 13 hours berth to berth. We ran at 2300 revs the whole way It was quite rough & we got a good soaking, with beam winds of 5-6. When we arrived we had to change berths through the lock etc so had another hour of tickover or light running & finding a berth
That totals 16 hours. We needed exactly 41 litres to top the tank again.
On the way back we went via Ramsgate -58 miles -then to Bradwell the following day I did not log the fuel but decided to hamer it and winds went from 18-30 kts at times we were travelling at over 7.4 kts TRUE speed The GPS recording 8-9 kts in places. I was surprised what speed could be produced & the bow wave was really impressive. 
So a Volvo D1 30HP engine will greatly improve the power. A 311 WILL reach hull speed But one WILL burn fuel. But It is there when you need it & on the trips there & back we did .My Volvo MD2020averaged  over 2 litres per hour over 5000 hours. It would have been geat sailing weather but I could not have been capable. Pity as it is my last trip before selling after 22 years



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Daydream Believer- Hanse 311- No GBR9917T- Bradwell Essex


Posted By: Caulkhead
Date Posted: 04 September 2025 at 15:25
Having had to motor into Portsmouth Harbour in the teeth of a Spring ebb a few times in my H348 with Yanmar 29hp (why is the tide always ebbing when I want to get back to my berth?).  In my opinion, there is no such thing as an engine that is "too powerful".  In the unlikely event that I were ever to buy another boat new, I would specify whichever engine had the highest HP.


Posted By: colin1
Date Posted: 26 September 2025 at 18:26
Thanks some useful insights - think we're going with the larger unit Thumbs Up


Posted By: SurfinSurgeon
Date Posted: 30 September 2025 at 00:24
In our "new" 345 the previous owner upgraded to a larger 28 hp. Our tidal streams here in San Diego our negligible but being used to a 15 hp on our "smaller" sailboat (at 4000 pounds) I would think that an 18-20 horsepower engine may be underpowered.


Posted By: Sounder
Date Posted: 30 September 2025 at 13:55
I agree that the 29 hp Yanmar is the way to go. We got our 348 new in 2021 and I've been very happy with it. It is friendly for single handing and handles like a dinghy; surprisingly nimble. Good luck!

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David S
NADINE (Hanse 348 #199)
Western Long Island Sound



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