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Author Topic: Position of twin schottel drives does it realy matter  (Read 2634 times)

portside II

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Position of twin schottel drives does it realy matter
« on: March 01, 2010, 09:34:20 PM »

Right i have had a pair of schottel drives(the big ones) on the shelf for far too long now .
So i want to build a new tug for them but am un decided as to where to fit them , fore , aft ???,
 so a little help would be appreciated .the plan shows some different set ups which i could use as well as the comon one that i have seen on the ponds , the thing is does the position realy matter if a skeg is fitted .The other option is to buy a third and build a ROTOR tug .
daz
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seahawk 1

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Re: Position of twin schottel drives does it realy matter
« Reply #1 on: March 02, 2010, 05:08:24 AM »

This is how mine is being set up, using 3 drives. (1761-small drives)  Umi's SDM tug uses twin schottels, 1 bow-1 stern,  though they are offset so the flow from the forward does not go directly to the stern drive.  Any photos I have seen of forward drive ASD tugs has the drives well forward of center.  For a little different hull layout, look for photos of the Falkenstein.

Mike



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Umi_Ryuzuki

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Re: Position of twin schottel drives does it realy matter
« Reply #2 on: March 02, 2010, 07:01:15 PM »

Here is a PDF for the SDM built in Spain...

 I wish I would have had this when I built my model..  {:-{


http://uglyships.files.wordpress.com/2008/11/vrs3_commercial-vessel-3516b-tugboat-2005.pdf

I almost set mine fore and aft on the centerline, but I
was able to contact the original design engineer, and he
sent me a truncated diagram of the drive positions.

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portside II

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Re: Position of twin schottel drives does it realy matter
« Reply #3 on: March 02, 2010, 09:23:32 PM »

Thankyou guys , that answers a few Q's regarding where to put them , in my first position they are on the center line but i was worried about prop wash from the forward prop to the aft prop .Off setting the props will reduce this .
Umi on the pdf plan the hull is not too clear if there are fixed rudders for and aft , can you help with more detail plz.
daz
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portside II

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Re: Position of twin schottel drives does it realy matter
« Reply #4 on: March 02, 2010, 09:34:23 PM »

oops here i go asking questions without reading the info supplied.

quote
 As before, the engines face in opposite
directions to turn Rolls-Royce type US 205
FP Z-Drives, mounted fore and aft and each
offset from the vessel centreline
the forward unit to starboard and the aft to port.
There are matching slotted skegs at both bow and stern.

daz
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Umi_Ryuzuki

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Re: Position of twin schottel drives does it realy matter
« Reply #5 on: March 03, 2010, 08:21:19 AM »

 :-)
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portside II

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Re: Position of twin schottel drives does it realy matter
« Reply #6 on: March 03, 2010, 09:24:12 AM »

Oh wow  :o , you are a star Umi . that picture is fab ,
ok the model will have supports around the hull to protect the drives and the skeg's .
But i am supprised that the bottom is so flat , which will make moulding easier .
Like the SDM i made using fixed props i think i will make a box first to house the gubbins and then with the deck fitted i can turn the whole thing upside down and fill out the sides with polly-styreen , give it a coat of PVA and paper and then glass it .
The supports and skegs can be added after, this is going to be a lump of a tug if i keep to the scale size of the original  :-)) .
daz
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funtimefrankie

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Re: Position of twin schottel drives does it realy matter
« Reply #7 on: March 05, 2010, 03:45:49 PM »

I've got two on the stern of my "nangee", but I think they are wasted there and I'm thinking of replacing with a one steerable Kort. Then doing something with the Schottels, one forward one to the stern, if I can find a suitable hull, or I may have to contstruct one.
I do prefer to start with a ready made glass hull though.
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