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Tunnel bow thruster

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Captain Cook View Drop Down
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    Posted: 13 July 2017 at 09:33
It seems that the retractable bow thruster supplied by Hanse is starting to malfunction after some years. Until now I have managed without the device, but now I'm planning to install a bow thruster.
In this forum I've only found the retractable model, and the exterior-mounted Side-Power/Exturn, and both models seems to recieve some bad remarks.
The Hanse 370 which is quite similar to the 400 has several examples with a tunnel-thruster, mounted approx. 1 meter from the bow.
Therefore I wonder if anybody in this forum have dared to mount a tunnel-thruster in a 400, and if the functionality was in order? (The flat bottom/the waterline is the challenge)
In my boat, there is a space in front of the water tank 75 by 75 centimeters with a height of 45 cm, which seems okay for a tunnel-thruster. The distance from the bow is from 1 meter to 1,75 m.
The drawing from "Skippers manual" (1:60) indicates a distance of 55-60 cm from the bottom to the waterline (1,70m from the bow), and my own sketchy measures points toward a distance of 45 cm from the inside bottom to the waterline.
Technically this should match the demand for at least 15 cm of water above the tunnel.
Any usable comments to my problem?
Sailors Salute
Kjeld



Edited by Captain Cook - 13 July 2017 at 09:35
Freya Hanse400#27
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Captain Cook Quote  Post ReplyReply Direct Link To This Post Posted: 16 July 2017 at 09:49
Today I made a more exact measure of the waterline compared to the inner bottom. 
In front of the watertank there is 35 cm from the GFK bottom to the waterline.
Due to the curvature of the bottom, there must be a minimum of 2 cm under the tunnel, and with a tunnel of 18,5 cm it leaves 14,5 cm of free hull material under the waterline.
A close call when the minimum distance is 15 cm.
Furthermore the structural strenght of the hull with two large holes very near the bottom has to be considered. The tunnel will be molded in GFK, but there may be a weakness anyway.
I would like to recieve usable comments from users of Side Power/Exturn exterior thrusters.


Freya Hanse400#27
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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: 16 July 2017 at 12:08
These are the reasons why I went for the Exturn solution. Afetr 4 seasons I can say that I am very happy with it:
-super efficiency
- very quiet
- Installation in one day
 
Mine has a separate 90 Ah AGM iin the bow charged by a separate BtoB charger from Sterling. Joystick at helm station and a additonal wireless handheld remote  to which I have also connected the anchor winch ).
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Post Options Post Options   Thanks (0) Thanks(0)   Quote alidal Quote  Post ReplyReply Direct Link To This Post Posted: 16 July 2017 at 12:46
Originally posted by Fendant Fendant wrote:

These are the reasons why I went for the Exturn solution. Afetr 4 seasons I can say that I am very happy with it:
-super efficiency
- very quiet
- Installation in one day
 
Mine has a separate 90 Ah AGM iin the bow charged by a separate BtoB charger from Sterling. Joystick at helm station and a additonal wireless handheld remote  to which I have also connected the anchor winch ).

I have the same experience on my 400 as well! Very happy with it! Clap
Hanse 400#655
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Captain Cook View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Captain Cook Quote  Post ReplyReply Direct Link To This Post Posted: 16 July 2017 at 21:34
Thanks to Fendant and alidal, it seems like the Exturn it may be.
Please tell me which model you purchased (3,0 kW-24V for the Hanse 400 I presume) and if there are issues to consider when I plan to let a skilled mechanic (my son-in-law) mount it.
BR
Kjeld


Edited by Captain Cook - 16 July 2017 at 21:36
Freya Hanse400#27
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alidal View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote alidal Quote  Post ReplyReply Direct Link To This Post Posted: 17 July 2017 at 07:21
I have the 300S. (They have changed no. from 300S to EX95)

(The link did not work, I dont now why!)Thumbs Down


Edited by alidal - 17 July 2017 at 07:25
Hanse 400#655
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