Model Boat Mayhem

Technical, Techniques, Hints, and Tips => The "Black Arts!" ( Electrics & Electronics ) => Topic started by: gregk9 on May 24, 2011, 01:41:33 PM

Title: Bow thruster installation.
Post by: gregk9 on May 24, 2011, 01:41:33 PM
I haev just recieved a Graupner bow thruster [ Nr 1785 - 14mm dia], to fit inside the hul of my RMAS Moorhen [see warships build thread]. I am a little stuck for height, so is it ok to angle the thruster motor slightly to accomodate it under the deck?
if yes, what is the maximum angle anyone has installed oen without any problems.

id like to be able to install with the motor horizontally placed, but looking at the schematic picture supplied in the box, it only shows vertical installation.

thanks in advance guys.
Title: Re: Bow thruster installation.
Post by: pugwash on May 24, 2011, 01:53:00 PM
Greg, logic says that if it is  totally sealed unit there is no reason that it can't be fitted horizontally.

Geoff
Title: Re: Bow thruster installation.
Post by: petermun on May 24, 2011, 02:34:42 PM
I have one of these fitted to a 48 inch narrowboat.   Because of the relatively low space in the hull I have fitted it at an angle of 45 degrees and it works with no problems.   Pete
Title: Re: Bow thruster installation.
Post by: gregk9 on May 24, 2011, 09:41:23 PM
Thanks for your advise. I initially tested the unit in a horizontal position in a water tank and have now installed it mounted horizontally in the hull.
(http://s1.postimage.org/1hgio3xqc/100_4141c.jpg) (http://postimage.org/image/1hgio3xqc/)

(http://s1.postimage.org/1hglz6mpw/100_4143c.jpg) (http://postimage.org/image/1hglz6mpw/)


Incidentally, if you ever need some pipe to extend the original 14mm bits suppiled with this type/size, try a visit to a diy shop and buy some 15mm plastic overflow pipe, it fits straight in to the stepped outlets of the pump assembly a treat, saves you having to joing bits on too. 1 piece of pipe, less leaks.
Title: Re: Bow thruster installation.
Post by: gregk9 on May 27, 2011, 09:56:43 PM
Have plumbed it in, via an mtroniks esc and the system works a treat. the esc gives me total thrust control, from just a trickle, to full thrust.
far better than just using it on full power all the time!
Title: Re: Bow thruster installation.
Post by: gregk9 on May 27, 2011, 11:37:44 PM
Due to the volume of water these bow thrusters push, would it be advisable to fit some mesh over the outlets on the hull?
Just to prevent anything getting drawn in and jamming the vanes?
Title: Re: Bow thruster installation.
Post by: CGAux26 on May 28, 2011, 03:17:54 AM
When mounting the motor off the vertical, keep in mind that the most likely point of leakage will be where the motor shaft penetrates the tunnel.  So keep the motor as near the top as possible.
Title: Re: Bow thruster installation.
Post by: gregk9 on May 29, 2011, 05:07:37 PM
I can just about manage to angle the motor upwards to about 45 degrees, so will do this.

but would anyone recommend putting mesh or grille bars over the outlets, to prevent the pump drawing something it shouldn't?
Im a bit wary of damaging the pump impeller if a small piece of twig or large feather quill was to enter the pipework, our pool does have a fair few swans about most of the time.
Title: Re: Bow thruster installation.
Post by: petermun on May 29, 2011, 05:51:39 PM
Again, on my narrowboat I have fitted fine mesh to keep out any leaves etc.   Pete M
Title: Re: Bow thruster installation.
Post by: CGAux26 on May 30, 2011, 04:03:36 AM
If your BT has a flange to hold the motor to the tunnel, try to mount (angle) it so you can get at the screws.  The Raboesch BT's are prone to the paddle slipping on its shaft.  I had that happen early in the life of my Loyal.
Title: Re: Bow thruster installation.
Post by: Peter Fitness on May 30, 2011, 06:42:42 AM
The Raboesch BT's are prone to the paddle slipping on its shaft.  I had that happen early in the life of my Loyal.

So did I, but I removed the paddle and put a spot of superglue on the paddle shaft....problem solved.

Peter.