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Springer Tug

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Bob Abell17/11/2007 14:31:00
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9337 forum posts
2985 photos
What is a FISHTAIL rudder please?
Manxman17/11/2007 16:36:00
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440 forum posts
133 photos

Hi Bob,

Fishtail rudder - not heard this name before,  I think they are talking about a 'Becker rudder'.  Where the last third of the blade moves in a greater arc than the front part,  this gives a curved look to the rudder when turning and should enable the boat to turn in its own length.

Have a look at my album 'Pacific Light', I have two of these fitted.

Go to page 8 of the album - this shows the component parts of the rudder and then to page 3 - were you'll see them fitted (photos 123/124/125).  They are not a direct swap for a standard rudder, as they need a bottom pivot and a secondary top pivot point.  The one's fitted here measure 100mm in height and are from 'Graupner' and cost £12 each.

Cheers - Kenny

Bob Abell17/11/2007 16:47:00
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9337 forum posts
2985 photos

Thanks Ken

I understand how it works now....................it`s very clever..........a bit like flaps on an aircraft

 The name fishtail came from the previous posting showing a logging type tugboat

Len Ochiltree17/11/2007 17:36:00
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525 forum posts
64 photos

Hi Guys,

I met a Canadian Tug Captain who was over here visiting a Model boat Regatta, when he spotted my Springer Tug he seached me out to chat, he also sails models and it was him that suggested that I try a Fishtail Rudder,he did a fag packet plan for me,as you may know I dont like spending cash so I make my rudders, for the Springer Tug "Gazunder" the rules say rudder to be no more than 2" square, so I got a piece of brass sheet 2" square and soldered the upright post 1/2"in from the prop side then marked a line 1/2" in from the opposite edge and bent it 45deg,get another piece of brass sheet 2"x1"and bend it at 45deg so that when you put the two together they look rather like a snakes forked tongue,solder these together,blimey I hope this makes sense.I dont have any thing holding the bottom of the rudder but thats up to you.  

ps, There are no moving parts to this rudder. 

Bob Abell17/11/2007 17:39:00
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9337 forum posts
2985 photos
Thank you Len.........................it`s something new to me!
Manxman17/11/2007 20:27:00
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440 forum posts
133 photos

Hi Len,

Your explanation sounds interesting, how does it fair in practise on your Springer ?. Even when going straight there would be a force on the rudder (both sides of the tongue) does this not slow the boat down.

As to the Springer 2"sq. (total 4 sq. inches) rudder rule - is your rudder allowed ?, using 2 plates bent into a forked tongue as you describe, you would end up with a surface area of 2"x2.5" (total 5 sq. inches)

Sorry to be a nit picker Len - but never the less it is an interesting rudder and one I'll keep in my ideas file.

Cheers - Kenny

Len Ochiltree18/11/2007 17:13:00
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525 forum posts
64 photos

Hi Guys,

Nitpicking is allowed,but not recomended, I also forgot to mention that on the top and bottom of the rudder is a plate 2" x 3/4",add that to your calcs,

The fork doesn't slow it down at all. 

I can see that I will have to take a photo,but it is too cold now and I have just got up after working all night!  

Manxman18/11/2007 17:16:00
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440 forum posts
133 photos

Cheers Len

They say a picture talks a thousand words - totally confused now - waiting for piccy !

Ken

Len Ochiltree19/11/2007 16:56:00
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525 forum posts
64 photos

1630hrs it was winging its way across the ether.

Len    

Len Ochiltree22/11/2007 16:46:00
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525 forum posts
64 photos

Fishtail photo is now on my Gallery,

Len               

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