Model Boat Mayhem
Technical, Techniques, Hints, and Tips => Other Technical Questions... => Topic started by: Capitaine LaGaffe on August 05, 2012, 03:30:14 pm
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Greetings,
Apart from using
1. A couple of Voith-Schneider Propellers (p'hap a ferry style double-ender with one at each end),
2. One or more Schottel units, or
3. Twin screws (I have a contraption with twin screws and steerable Kort nozzles, everything independently controlled – witch tends to confuse my poor brain – so my [stupid] idea is to try something else – possible less taxing for mu brain)
Which provides more maneuverability (assuming a single screw – and probably a bow thruster)?—
A. A Steerable Kort nozzle
B. A fixed Kort + rudder
C. Fixed Kort + Becker rudder
D. No nozzle, becker rudder
E. No nozzle, twin rudders (a lot of the river boats/ship exhibited as models at the SWiss transportation museum in Luzern had a single screw and twin rudders IIRC).
F. No nozzle, plain old rudder.
6. Something else I haven't thought about.
tia/tm
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Twin Kitchin.
Regards Ian.
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Multiple rudders
Bow & stern thrusters
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Hi, Keep it simple, steering Kort with a slightly elongated rudder. By the time you have mastered that system you can move onto something else, altho you may find that there is no need to do so. Nemesis
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Different hull shapes need different ideas.
Becker rudders can be very efficient behind a kort
or behind a big prop.
Ned
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Any difference when going astern?
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Hi, A steering Kort, Yes, very good both ways. A fixed (Towmaster ) Kort is not so good even with the Becker. My opinion and experience only. I can do figure of eights astern with one boat using a steering kort, can not with the other, Keep it simple,
Nemesis
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twin screw twin rudders,on a hydroconic hull you can a tug dance.
pima.
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Independently driven paddles?
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And always, as in "How do you get to Carnegie Hall? Practice, practice, practice." O0
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Independently driven paddles?
Not very good if you want to go sideways. I have a side-wheeler like that; don't know what a quarter-wheeler is like in practice.
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Hi, A steering Kort, Yes, very good both ways. A fixed (Towmaster ) Kort is not so good even with the Becker. My opinion and experience only. I can do figure of eights astern with one boat using a steering kort, can not with the other, Keep it simple,
Nemesis
Definitely one thing in favour of a single steerable Kort: it's simple. Especially compared to a North American style set up with steering and flanking rudders. KISS indeed!
(Conceptually simple, and something neither my brain nor my thumbs would have much problem with, is a double-ender ferry-style twin-VSP setup, but VSPs are not uncomplicated to set up and the nearest pond is very shallow …)
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triple rudder behind a prop/kort combination , being put onto fishing boats up here just now as it maximises bollard pull when turning so would be useful on a tug as well
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I'd say a couple of new Seals on the rudder http://www.youtube.com/watch?v=vUCBx9zx-UA&feature=related
Dave
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Hi, Davey, I hope they do not get the nets caught up in that lot, I can remember the clart on when they started to use Korts. My diver friend made a lot of money cutting the nets free. Nemesis
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the older boats didn't have enough power in the winch's to haul the gear in when going ahead thats why there was problems initially , the boats now have winches so powerful that they will pull a 200t 21m boat backwards when the engine is in gear and would have been towing the gear at 2knots !!! ( 20t bollard pull minimum per barrel , 3 barrel winches !! )
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Hi all, I have a small 28 inches cabin cruiser (Graupner Condor, scratch built from the plans, 50 years ago). Some years ago I modified it to have a fixed kort nozzle and twin rudders ahead of prop and a single astern. (like the American tow boats).
I am afraid it made very little difference to maneuverability, it may be because there is not much power there? (6 volts about an amp current).
I was hoping for better control astern.
regards Roy